Charge-domain switched-g sub(m)-C CBPF using semi-passive charge-sharing technique

A highly reconfigurable charge-domain switched-g sub(m)-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 g sub(m)-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.