A high-performance micropower switched-capacitor filter

—MOS technology scaling requires the use of lower supply voltages. Analog circuits operating from a low supply and achieving a sufficiently farge dynamic range must be designed if analogidigital interfaces are to be implemented in scaled technologies. This paper describes a high-performance fifth-order low-pass switched-capacitor filter operating from a single 5-V supply. The filter uses a fully differential topology combined with input-to-output class A B amplifier design, dynamic biasing, and switched-capacitor common-mode feedback (CMFB). An experimental prototype fabricated in a 5- p m CMOS technology requires orlly 350 pW of power to meet the PCM channel filter requirements. Typical measured results are a dynamic range of 92 dB, a supply rejection (PSRR) of 40 dB over the entire Nyquist range, and a total harmonic distortion (THD) of – 73 dB for a 2-V rms dlfferentiaf output signal. The chip active area is about 3900 milz.