ClassID:

188772

G05F3/262 - page 3 - CPC Classification

Classification description:

Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations; Current mirrors using field-effect transistors only

Recent Application in this class:
#601
20160098057
2016-04-07

Voltage regulator

#602
20160091917
2016-03-31

CONSTANT CURRENT-CONSTANT VOLTAGE CIRCUIT

#603
20160091916
2016-03-31

Bandgap Circuits and Related Method

#604
20160087645
2016-03-24

Apparatus and method for digital to analog conversion with current mirror amplification

#605
20160082846
2016-03-24

Current mode control type switching power supply device

#606
20160082845
2016-03-24

Current mode control type switching power supply device

#607
20160077540
2016-03-17

Band-gap reference circuit based on temperature compensation

#608
20160072516
2016-03-10

Voltage regulator with load compensation

#609
20160070291
2016-03-10

Static offset reduction in a current conveyor

#610
20160062385
2016-03-03

Generating a current with inverse supply voltage proportionality

#611
20160062384
2016-03-03

Current steering mode digital-to-analog converter circuit configured to generate variable output current

#612
20160056288
2016-02-25

Circuit element including a layer of a stress-creating material providing a variable stress

#613
20160026206
2016-01-28

Constant current source circuit

#614
20160018838
2016-01-21

dB-linear voltage-to-current converter

#615
20150370281
2015-12-24

Noise canceling current mirror circuit for improved PSR

#616
20150355665
2015-12-10

Negative reference voltage generating circuit and negative reference voltage generating system using the same

#617
20150349131
2015-12-03

Semiconductor device including oxide semiconductor

#618
20150333738
2015-11-19

Integrated circuit process and bias monitors and related methods

#619
20150326208
2015-11-12

Differential reference signal distribution method and system

#620
20150309527
2015-10-29

Temperature coefficient factor circuit, semiconductor device, and radar device

#621
20150286240
2015-10-08

Transistor matching for generation of precise current ratios

#622
20150286235
2015-10-08

Power-efficient, low-noise, and process/voltage/temperature (PVT)—insensitive regulator for a voltage-controlled oscillator (VCO)

#623
20150277470
2015-10-01

Current mirror circuit and receiver using the same

#624
20150263683
2015-09-17

Method and circuit for improving the settling time of an output stage

#625
20150263618
2015-09-17

Voltage supply circuit having an absorption unit and method for operating the same

#626
20150253799
2015-09-10

Temperature insensitive transient current source

#627
20150241902
2015-08-27

Integrated circuit with transistor array and layout method thereof

#628
20150236579
2015-08-20

Current generation circuits and semiconductor devices including the same

#629
20150235711
2015-08-20

Low voltage current reference generator for a sensing amplifier

#630
20150234414
2015-08-20

Low power proportional to absolute temperature current and voltage generator

#631
20150234413
2015-08-20

Flipped gate voltage reference and method of using

#632
20150234412
2015-08-20

Flipped gate voltage reference having boxing region and method of using

#633
20150227158
2015-08-13

Semiconductor device including a constant voltage generation unit

#634
20150227157
2015-08-13

Precision current sensing

#635
20150207513
2015-07-23

Current mirror circuit and charge pump circuit

#636
20150205319
2015-07-23

Apparatus and method for low voltage reference and oscillator

#637
20150194954
2015-07-09

Circuit for generating bias current

#638
20150177772
2015-06-25

Electronic circuit with self-calibrated PTAT current reference and method for actuating the same

#639
20150177769
2015-06-25

Voltage generation circuits and semiconductor devices including the same

#640
20150160679
2015-06-11

System and method for generating cascode current source bias voltage

#641
20150153758
2015-06-04

Leakage-current start-up reference circuit

#642
20150145608
2015-05-28

High frequency low-gain noise ring-type VCO oscillator leading to a low-noise/area PLL

#643
20150145588
2015-05-28

Bi-directional current sensor

#644
20150097630
2015-04-09

Method and device for managing the time transition of a CMOS logic circuit as a function of temperature

#645
20150069921
2015-03-12

Device having light intensity measurement in presence of shadows

#646
20150061772
2015-03-05

Circuit to reduce output capacitor of LDOs

#647
20150054586
2015-02-26

Constant GM bias circuit insensitive to supply variations

#648
20150054477
2015-02-26

Power switch with current limitation and zero direct current (DC) power consumption

#649
20150049060
2015-02-19

Charge distribution

#650
20150048892
2015-02-19

Low-noise current source

#651
20150035591
2015-02-05

Low-noise reference voltages distribution circuit

#652
20150035567
2015-02-05

Output driver circuit

#653
20150002131
2015-01-01

Reference-voltage circuit

#654
20140368180
2014-12-18

REFERENCE VOLTAGE GENERATOR AND VOLTAGE GENERATING SYSTEM HAVING THE SAME

#655
20140340069
2014-11-20

Current generator circuit and methods for providing an output current

#656
20140340063
2014-11-20

Integrated circuit for controlling an inductive boost converter

#657
20140312963
2014-10-23

Switchable current source circuit and method

#658
20140247087
2014-09-04

Current control for output device biasing stage

#659
20140239928
2014-08-28

Voltage regulator

#660
20140225588
2014-08-14

Static offset reduction in a current conveyor

#661
20140176196
2014-06-26

Method and apparatus for multi-level de-emphasis

#662
20140132814
2014-05-15

Semiconductor integrated circuit, current control method, ad converter, solid-state imaging device, and electronic system

#663
20140132242
2014-05-15

Current mirror circuits in different integrated circuits sharing the same current source

#664
20140117969
2014-05-01

Constant current source circuit

#665
20140117968
2014-05-01

Supply voltage independent bandgap circuit

#666
20140055119
2014-02-27

Power supply of a load at a floating-potential

#667
20130342266
2013-12-26

Impedance transformation with transistor circuits

#668
20130307518
2013-11-21

Self-calibrating differential current circuit

#669
20130300506
2013-11-14

Accurate bias tracking for process variation and supply modulation

#670
20130300395
2013-11-14

ACCESSORY DETECTION OVER TEMPERATURE

#671
20130271231
2013-10-17

Oscillator module and reference circuit thereof

#672
20130271106
2013-10-17

Optimization methodology and apparatus for wide-swing current mirror with wide current range

#673
20130265089
2013-10-10

Systems and methods for starting up analog circuits

#674
20130162358
2013-06-27

Reference current generator circuit

#675
20130120177
2013-05-16

Data converter current sources using thin-oxide core devices

#676
20130076331
2013-03-28

Constant output reference voltage circuit

#677
20130057175
2013-03-07

Driver circuit and related error detection circuit and method

#678
20130038384
2013-02-14

Canceling third order non-linearity in current mirror-based circuits

#679
20130027124
2013-01-31

Electronic comparison circuit

#680
20130002314
2013-01-03

Method and apparatus for low jitter distributed clock calibration

#681
20130002228
2013-01-03

Current source with low power consumption and reduced on-chip area occupancy

#682
20120306549
2012-12-06

SEMICONDUCTOR INTEGRATED CIRCUIT

#683
20120286852
2012-11-15

CHARGE-DISCHARGE DEVICE

#684
20120256610
2012-10-11

Step down current mirror for DC/DC boost converters

#685
20120249114
2012-10-04

Constant current generation circuit and microprocessor including the same

#686
20120228934
2012-09-13

Multi-current source and method for regulating current

#687
20120223688
2012-09-06

High power supply rejection ratio (PSRR) and low dropout regulator

#688
20120217951
2012-08-30

Supply independent current reference generator in CMOS technology

#689
20120200269
2012-08-09

Calibration apparatus and calibration method thereof

#690
20120194264
2012-08-02

Current mirror and current cancellation circuit

#691
20120176198
2012-07-12

Bias generation circuit, power amplifier module, and semiconductor device

#692
20120169422
2012-07-05

Amplifier with non-linear current mirror

#693
20120161876
2012-06-28

Accurate bias tracking for process variation and supply modulation

#694
20120161741
2012-06-28

Current generator for temperature compensation

#695
20120132965
2012-05-31

Photoelectric conversion device and electronic device having the same

#696
20120105046
2012-05-03

CURRENT MIRROR USING AMBIPOLAR DEVICES

#697
20120098506
2012-04-26

Low noise current buffer circuit and I-V converter

#698
20120086503
2012-04-12

Constant current circuit and semiconductor integrated circuit

#699
20120081174
2012-04-05

Switched current mirror with good matching

#700
20120077551
2012-03-29

High-voltage tolerant voltage regulator

#701
20120075007
2012-03-29

Reference current generating circuit, reference voltage generating circuit, and temperature detection circuit

#702
20120049927
2012-03-01

Methods, sub-systems and systems that reduce a mismatch error associated with an analog circuit

#703
20120049921
2012-03-01

Offset cancellation current mirror and operating method thereof

#704
20120049817
2012-03-01

Current generator circuit and method for reduced power consumption and fast response

#705
20120038418
2012-02-16

dB-linear voltage-to-current converter

#706
20120038343
2012-02-16

Constant current source and solid imaging apparatus using the same

#707
20120025737
2012-02-02

Current driving circuit

#708
20120013389
2012-01-19

Capacitively coupled switched current source

#709
20120001613
2012-01-05

High-bandwidth linear current mirror

#710
20110309808
2011-12-22

BIAS-STARVING CIRCUIT WITH PRECISION MONITORING LOOP FOR VOLTAGE REGULATORS WITH ENHANCED STABILITY

#711
20110304387
2011-12-15

Current mirror circuit

#712
20110304362
2011-12-15

Current-source circuit

#713
20110279174
2011-11-17

Impedance transformation with transistor circuits

#714
20110273231
2011-11-10

SEMICONDUCTOR INTEGRATED CIRCUIT

#715
20110260796
2011-10-27

Bias circuit, power amplifier, and current mirror circuit

#716
20110199070
2011-08-18

Current mirror arrangement and method for switching on a current

#717
20110193613
2011-08-11

Switchable current source circuit and method

#718
20110163795
2011-07-07

SEMICONDUCTOR CIRCUIT AND COMPUTER SYSTEM

#719
20110121888
2011-05-26

LEAKAGE CURRENT COMPENSATION

#720
20110121809
2011-05-26

Voltage reference circuit

#721
20110115452
2011-05-19

Output driver circuits for voltage regulators

#722
20110084682
2011-04-14

Programmable current mirror

#723
20110068764
2011-03-24

Semiconductor circuits capable of mitigating unwanted effects caused by input signal variations

#724
20110018621
2011-01-27

CURRENT MIRROR CIRCUIT

#725
20100327844
2010-12-30

CURRENT MIRROR, DEVICES INCLUDING SAME, AND METHODS OF OPERATION THEREOF

#726
20100327843
2010-12-30

Wide-swing cascode current mirror

#727
20100321223
2010-12-23

Current mirror circuit and digital-to-analog conversion circuit

#728
20100308906
2010-12-09

Impedance transformation with transistor circuits

#729
20100289563
2010-11-18

Method and mechanism to reduce current variation in a current reference branch circuit

#730
20100289462
2010-11-18

Calibration apparatus and calibration method thereof

#731
20100259317
2010-10-14

HIGH-OUTPUT-IMPEDANCE CURRENT MIRROR

#732
20100231289
2010-09-16

CMOS bias circuit

#733
20100201671
2010-08-12

METHODS AND APPARATUS FOR PRODUCING PRECISION CURRENT OVER A WIDE DYNAMIC RANGE

#734
20100194443
2010-08-05

dB-linear voltage-to-current converter

#735
20100176786
2010-07-15

CONSTANT CURRENT CIRCUIT

#736
20100156389
2010-06-24

Reducing the effect of bulk leakage currents

#737
20100148870
2010-06-17

Adaptive feedback cascode

#738
20100140456
2010-06-10

Semiconductor device including a current mirror circuit

#739
20100127765
2010-05-27

Device for providing substantially constant current in response to varying voltage

#740
20100120383
2010-05-13

Differential output circuit and communication device

#741
20100117619
2010-05-13

Current-mirror circuit

#742
20100109763
2010-05-06

STANDARD VOLTAGE GENERATION CIRCUIT

#743
20100102874
2010-04-29

Semiconductor device

#744
20100052775
2010-03-04

Voltage supply with low power and leakage current

#745
20100052646
2010-03-04

Current mirror with immunity for the variation of threshold voltage and the generation method thereof

#746
20100052645
2010-03-04

Reference current generator circuit for low-voltage applications

#747
20100026365
2010-02-04

Robust current mirror with improved input voltage headroom

#748
20100019806
2010-01-28

Stacked cascode current source

#749
20090295465
2009-12-03

All NPN-transistor PTAT current source

#750
20090278603
2009-11-12

ALL N-TYPE TRANSISTOR HIGH-SIDE CURRENT MIRROR

#751
20090268538
2009-10-29

Current sensing circuit and semiconductor memory device including the same

#752
20090261866
2009-10-22

Voltage divider circuit

#753
20090230879
2009-09-17

Driver circuit, method for operating and use of a current mirror of a driver circuit

#754
20090201080
2009-08-13

Current mirror circuit and digital-to-analog conversion circuit

#755
20090195236
2009-08-06

Semiconductor circuits capable of mitigating unwanted effects caused by input signal variations

#756
20090189647
2009-07-30

Bias current generator for multiple supply voltage circuit

#757
20090184755
2009-07-23

Current control apparatus applied to transistor

#758
20090184696
2009-07-23

Voltage source for gate oxide protection

#759
20090167263
2009-07-02

Current limiting circuit and voltage regulator using the same

#760
20090160557
2009-06-25

SELF-BIASED CASCODE CURRENT MIRROR

#761
20090160539
2009-06-25

Voltage reference circuit

#762
20090160420
2009-06-25

Differential current mirror circuit

#763
20090153126
2009-06-18

Current mirror circuit

#764
20090146733
2009-06-11

Semiconductor integrated circuit

#765
20090128231
2009-05-21

CIRCUITS FOR GENERATING REFERENCE CURRENT AND BIAS VOLTAGES, AND BIAS CIRCUIT USING THE SAME

#766
20090121750
2009-05-14

Constant current drive device

#767
20090115502
2009-05-07

Reference current circuit, reference voltage circuit, and startup circuit

#768
20090085550
2009-04-02

Circuit including first and second transistors coupled between an outpout terminal and a power supply

#769
20090066313
2009-03-12

Reference voltage circuit compensated for temprature non-linearity

#770
20090051416
2009-02-26

Apparatus, electronic component and method for generating reference voltage

#771
20090045869
2009-02-19

Semiconductor circuit and controlling method thereof

#772
20090045793
2009-02-19

Stabilizing methods for current source

#773
20090033311
2009-02-05

Current Source with Power Supply Voltage Variation Compensation

#774
20090027372
2009-01-29

Photoelectric conversion device and electronic device having the same

#775
20090001959
2009-01-01

Current mirror circuit having drain-source voltage clamp

#776
20080297234
2008-12-04

Current mirror bias trimming technique

#777
20080284501
2008-11-20

REFERENCE BIAS CIRCUIT FOR COMPENSATING FOR PROCESS VARIATION

#778
20080265853
2008-10-30

Linear voltage regulating circuit with undershoot minimization and method thereof

#779
20080258779
2008-10-23

Semiconductor integrated circuit

#780
20080258778
2008-10-23

CURRENT MIRROR CIRCUIT

#781
20080238401
2008-10-02

Method and apparatus for adjusting a reference

#782
20080238384
2008-10-02

Current source circuit and method of outputting current

#783
20080231386
2008-09-25

Oscillation circuit having current scaling relationship and the method for using the same

#784
20080231249
2008-09-25

Integrated circuit current reference

#785
20080224737
2008-09-18

Current mirror circuit

#786
20080218253
2008-09-11

Low power voltage reference

#787
20080197829
2008-08-21

Semiconductor Device and Voltage Regulator Using the Semiconductor Device

#788
20080191793
2008-08-14

Ratioed feedback body voltage bias generator

#789
20080191680
2008-08-14

Bias circuit

#790
20080186101
2008-08-07

Biasing scheme for low-voltage MOS cascode current mirrors

#791
20080157861
2008-07-03

STANDARD VOLTAGE GENERATION CIRCUIT

#792
20080136392
2008-06-12

Method and apparatus for trimming current limit and frequency to maintain a constant maximum power

#793
20080106247
2008-05-08

Trimmed current mirror

#794
20080079481
2008-04-03

Semiconductor device with current mirror circuit having two transistors of identical characteristics

#795
20080074174
2008-03-27

Current mirror circuit having drain-source voltage clamp

#796
20080072181
2008-03-20

Ratioed feedback body voltage bias generator

#797
20080068072
2008-03-20

Ratioed feedback body voltage bias generator

#798
20080067991
2008-03-20

Current generating apparatus and feedback-controlled system utilizing the current generating apparatus

#799
20080048771
2008-02-28

Constant current circuit

#800
20080048738
2008-02-28

Voltage/current converter circuit and method for providing a ramp current

#801
20080042741
2008-02-21

Light emitting device and current mirror thereof

#802
20080042734
2008-02-21

Voltage-controlled current source and frequency scanner using the same

#803
20080036442
2008-02-14

Constant-current circuit and system power source using this constant-current circuit

#804
20080024105
2008-01-31

Method and apparatus for adjusting a reference

#805
20080018320
2008-01-24

Current balance arrangement

#806
20080018315
2008-01-24

Constant current supply circuit capable of being trimmed

#807
20080012630
2008-01-17

Semiconductor device including current mirror circuit

#808
20080007325
2008-01-10

Current source circuit

#809
20080001672
2008-01-03

Auto-range current mirror circuit

#810
20070296487
2007-12-27

Voltage generation circuit and method thereof

#811
20070290740
2007-12-20

Current Mirror Arrangement

#812
20070285171
2007-12-13

High-speed CMOS current mirror

#813
20070285153
2007-12-13

SEMICONDUCTOR DEVICE WITH LEAKAGE CURRENT COMPENSATING CIRCUIT

#814
20070279114
2007-12-06

Controllable current source for a phase locked loop

#815
20070273434
2007-11-29

Receiver start-up compensation circuit

#816
20070268008
2007-11-22

Linear voltage regulator and method of limiting the current in such a regulator

#817
20070252213
2007-11-01

Semiconductor device including a current mirror circuit

#818
20070247230
2007-10-25

Gate leakage insensitive current mirror circuit

#819
20070247215
2007-10-25

Reference voltage source and current source circuits

#820
20070241822
2007-10-18

Chain-chopping current mirror and method for stabilizing output currents

#821
20070241738
2007-10-18

Start up circuit apparatus and method

#822
20070241737
2007-10-18

Current source apparatus for reducing interference with noise

#823
20070229166
2007-10-04

Buffered cascode current mirror

#824
20070229150
2007-10-04

Low-voltage regulated current source

#825
20070216484
2007-09-20

DC current regulator insensitive to conducted EMI

#826
20070216447
2007-09-20

Current comparator using wide swing current mirrors

#827
20070210858
2007-09-13

Circuit and method for fast switching of a current mirror with large MOSFET size

#828
20070210726
2007-09-13

Current limiting circuit

#829
20070200545
2007-08-30

High impedance current mirror with feedback

#830
20070194838
2007-08-23

Current mirror with improved output impedance at low power supplies

#831
20070194837
2007-08-23

OLED PANEL AND RELATED CURRENT MIRRORS FOR DRIVING THE SAME

#832
20070176590
2007-08-02

Reference voltage circuit driven by non-linear current mirror circuit

#833
20070164722
2007-07-19

Low power beta multiplier start-up circuit and method

#834
20070146061
2007-06-28

CMOS REFERENCE VOLTAGE SOURCE

#835
20070109040
2007-05-17

Stacked CMOS current mirror using MOSFETs having different threshold voltages

#836
20070109039
2007-05-17

Reference circuit capable of supplying low voltage precisely

#837
20070108957
2007-05-17

Constant-current circuit and system power source using this constant-current circuit

#838
20070096797
2007-05-03

Method to avoid device stressing

#839
20070096713
2007-05-03

Digital current source

#840
20070075766
2007-04-05

CMOS reference current source

#841
20070075688
2007-04-05

Differential input/differential output converter circuit

#842
20070069711
2007-03-29

Diode stack high voltage regulator

#843
20070063687
2007-03-22

Circuit and method for bias voltage generation

#844
20070057730
2007-03-15

Margin tracking cascode current mirror system and method

#845
20070057717
2007-03-15

Circuits for generating reference current and bias voltages, and bias circuit using the same

#846
20070052480
2007-03-08

Circuit which can be programmed using a resistor and which has a reference current source

#847
20070046364
2007-03-01

Constant current circuit operating independent of temperature

#848
20070019487
2007-01-25

Reference current generator

#849
20070007934
2007-01-11

MOSFET triggered current boosting technique for power devices

#850
20060290418
2006-12-28

Wide-band wide-swing CMOS gain enhancement technique and method therefor

#851
20060290416
2006-12-28

Low-leakage current sources and active circuits

#852
20060279970
2006-12-14

Switching power converter controller

#853
20060279269
2006-12-14

Voltage-regulator and power supply having current sharing circuit

#854
20060273773
2006-12-07

Method and apparatus for trimming current limit and frequency to maintain a constant maximum power

#855
20060268629
2006-11-30

Reference voltage generator

#856
20060267676
2006-11-30

Voltage supply with low power and leakage current

#857
20060267675
2006-11-30

PMOS current mirror with cascaded PMOS transistors and zero voltage gate threshold transistor

#858
20060261863
2006-11-23

Circuit for generating identical output currents

#859
20060255787
2006-11-16

Voltage controlled current source device

#860
20060232340
2006-10-19

Current mirror with low headroom requirement

#861
20060226893
2006-10-12

Bias circuit for high-swing cascode current mirrors

#862
20060226892
2006-10-12

Circuit for generating a reference current

#863
20060197517
2006-09-07

Power supply circuit

#864
20060192611
2006-08-31

Body-biased enhanced precision current mirror

#865
20060181338
2006-08-17

Stacked CMOS current mirror using MOSFETs having different threshold voltages

#866
20060176041
2006-08-10

Temperature independent low reference voltage source

#867
20060170490
2006-08-03

Fast dynamic low-voltage current mirror with compensated error

#868
20060170489
2006-08-03

Fast dynamic low-voltage current mirror with compensated error

#869
20060170488
2006-08-03

Reference voltage generation circuit

#870
20060145753
2006-07-06

System for setting an electrical circuit parameter at a predetermined value

#871
20060145751
2006-07-06

Analog MOS circuits having reduced voltage stress

#872
20060145679
2006-07-06

Voltage regulator having positive temperature coefficient for self-compensation and related method of regulating voltage

#873
20060139088
2006-06-29

Biasing scheme for low supply headroom applications

#874
20060132239
2006-06-22

Input tracking current mirror for a differential amplifier system

#875
20060132225
2006-06-22

Standard voltage generation circuit

#876
20060125566
2006-06-15

Current mirror with low static current and transconductance amplifier thereof

#877
20060125547
2006-06-15

Adjustable and programmable temperature coefficient-proportional to absolute temperature (APTC-PTAT) circuit

#878
20060125463
2006-06-15

Voltage-controlled current source

#879
20060125460
2006-06-15

Reference current generator

#880
20060119496
2006-06-08

Method for implementation of a low noise, high accuracy current mirror for audio applications

#881
20060119423
2006-06-08

Bias control system for a power amplifier

#882
20060119422
2006-06-08

Semiconductor device including current control circuit of reference current source

#883
20060114055
2006-06-01

Cascode current mirror circuit operable at high speed

#884
20060113982
2006-06-01

Regulated current mirror

#885
20060103454
2006-05-18

Temperature compensated FET constant current source

#886
20060103453
2006-05-18

Voltage down converter

#887
20060097774
2006-05-11

Semiconductor device with leakage current compensating circuit

#888
20060091940
2006-05-04

CMOS current mirror circuit and reference current/voltage circuit

#889
20060087367
2006-04-27

Current source circuit

#890
20060066361
2006-03-30

Apparatus and method for voltage conversion

#891
20060061413
2006-03-23

Voltage reference generator with flexible control of voltage

#892
20060056254
2006-03-16

Electric circuit for providing a selection signal

#893
20060055465
2006-03-16

Low voltage output current mirror method and apparatus thereof

#894
20060055454
2006-03-16

Dynamic transconductance boosting technique for current mirrors

#895
20060038618
2006-02-23

Precision current mirror and method for voltage to current conversion in low voltage applications

#896
20060033557
2006-02-16

Reference circuit

#897
20060033481
2006-02-16

Active dropout optimization for current mode LDOs

#898
20060022659
2006-02-02

Method and apparatus for trimming current limit and frequency to maintain a constant maximum power

#899
20060017495
2006-01-26

Symmetrically matched voltage mirror and applications therefor

#900
20060012441
2006-01-19

Phase-locked loop with conditioned charge pump output