H03H2210/023 - CPC Classification Index

ClassID:

221099 ⎘

H03H2210/023 - CPC Classification

Classification description:

Indexing scheme relating to details of tunable filters; Variable filter component; Amplifier, e.g. transconductance amplifier Tuning of transconductance via tail current source

Recent Application in this class:

20170264257

2017-09-14

Method for producing a batch of acoustic wave filters

20160094199

2016-03-31

Resonant circuit with variable frequency and impedance

20130342267

2013-12-26

Image rejection for low IF receivers

20110166817

2011-07-07

Method for calibrating frequency of g-C filter and devices using the method

20110025411

2011-02-03

Apparatus and method for tuning a GM-C filter

20080252365

2008-10-16

Apparatus and method for tuning center frequency of a filter

20070229174

2007-10-04

CALIBRATION LOOP, FILTER CIRCUIT AND RELATED METHOD CAPABLE OF AUTOMATICALLY ADJUSTING CENTER FREQUENCY OF A FILTER

20070115070

2007-05-24

Apparatus and method for tuning center frequency of a filter

20050148309

2005-07-07

Automatic tuning apparatus for filter and communication instrument