Abstract
A 5 kHz linear-phase lowpass filter is implemented in a 2-/spl mu/m BiCMOS technology as a combination of sigma-delta front-end, a digital shift register, a switched capacitor (SC) summer circuit with 50 input capacitors, and an SC biquad running at a 1 MHz clock. The measured group delay variation in the passband is less than 1 /spl mu/s and the measured total harmonic distortion (THD) is -80 dB for an input sine wave amplitude of 0.7 V at 1 kHz. The circuit consumes 80 mW from /spl plusmn/5 V supply and measures 8.12 mm/sup 2/ without pads.
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