A CMOS Low-Power Widely Frequency Tunable Pre-Conditioning Stage for PSD Sensor Applications

摘要

This paper presents a CMOS digitally programmable band-pass filter with independently controlled parameters, to be employed as a highly reconfigurable preconditioning stage in a general purpose phase sensitive detection (PSD) on-chip instrument to support CMOS impedance and MEM μ-resonator-based sensors. Frequency tuning range with a linear dependence over four decades up to 1 MHz is achieved, with reduced area and power consumption lower than 0.4 mW, while preserving stable band-pass response with a quality factor Q of 10 and a 20 dB gain.