Title :
Mixed analog/digital, FIR/IIR realization of a linear-phase lowpass filter
Author_Institution :
Integrated Syst. Lab., Swiss Federal Inst. of Technol., Zurich, Switzerland
fDate :
9/1/1996 12:00:00 AM
Abstract :
A 5 kHz linear-phase lowpass filter is implemented in a 2-μm 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 μs 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 ±5 V supply and measures 8.12 mm2 without pads
Keywords :
BiCMOS integrated circuits; FIR filters; IIR filters; delay circuits; low-pass filters; mixed analogue-digital integrated circuits; -5 V; 1 MHz; 2 micron; 5 V; 5 kHz; 80 mW; BiCMOS technology; FIR/IIR realization; SC biquad; SC summer circuit; THD; digital shift register; group delay variation; linear-phase lowpass filter; mixed analog/digital realization; sigma-delta front-end; switched capacitor summer circuit; total harmonic distortion; Adders; BiCMOS integrated circuits; Delta-sigma modulation; Digital filters; Distortion measurement; Finite impulse response filter; IIR filters; Shift registers; Switched capacitor circuits; Switching circuits;
Journal_Title :
Solid-State Circuits, IEEE Journal of
