Abstract
A highly reconfigurable charge-domain switched-gm-C complex bandpass filter (CBPF) topology that utilises a semi-passive charge-sharing technique is proposed. It uses only switches, capacitors, digital circuitry for three-phase non-overlapping clock generation and efficient gm-stages. Simulated in a 65 nm CMOS, a first-order CBPF operating at 1 GS/s sampling rate demonstrates flexible tunability of the centre frequency and bandwidth with a highly passive/digital implementation. The presented filter architecture features excellent power efficiency and compatibility with process scaling.
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