Tunable duplexing circuit

Filter auto-calibration using multi-clock generator

Signal processing apparatus, signal processing method and communication apparatus

Filter auto-calibration using multi-clock generator

In-situ RC-calibration scheme for active RC filter

Automatic cutoff frequency adjusting circuit and portable digital assistant

Method for tuning a RF front-end circuit using an on-chip negative transconductance circuit to make an oscillator

Apparatus and methods for reducing noise in oscillating signals

Phase locked loop-based tuning adjustable filter

Receiver with tuner front end using tracking filters and calibration

Adaptive radio transceiver with offset PLL with subsampling mixers

Boosted-bias tunable filter with dynamic calibration

Self-aligning resonator filter circuits

Apparatus and method for tuning center frequency of a filter

Boosted-bias tunable filter with dynamic calibration

Tunable filter apparatus, systems, and methods

Apparatus and method for tuning center frequency of a filter

Receiver IQ imbalance calibration

Boosted-bias tunable filter with dynamic calibration

Self-aligning resonator filter circuit and wideband tuner circuit incorporating same

Radio-controlled timepiece

Programmable filter

Systems and methods for automated resonant circuit tuning

Adaptive radio transceiver with offset PLL with subsampling mixers