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This paper proposes a passband lock loop for tunable band-pass-filter (BPF). AC-coupling, swing amplification, peak conversion and low-noise S/H circuit are designed to differentiate several hundred uV of swing difference. All-digital peak-tracking-controller and FSM are also realized for easy verification and low area. The proposed loop was integrated with a BPF cell with 7-bits controls and 30M∼50MHz...
A bandpass amplifier with enhanced image rejection for radio frequency (RF) applications is presented. The proposed amplifier using MOS varactors and active inductors is designed for both 2.4GHz bandpass and 2.8GHz image-rejection notch filtering. With active inductors and MOS varactors, this amplifier needs no passive devices. With 2V supply voltage, the circuit exhibits gain of 20dB and image-rejection...
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