Title :
A low-power BiCMOS switched-capacitor filter for audio codec applications
Author :
Baschirotto, A. ; Brasca, G. ; Montecchi, F. ; Stefani, F.
Author_Institution :
Dipt. di Elettronica, Pavia Univ., Italy
fDate :
7/1/1997 12:00:00 AM
Abstract :
A fully integrated fourth-order filter embedded in a complete 16-b oversampled D/A converter to be used in an audio stereo codec is presented. The possible noise and distortion sources have been accurately evaluated in the design and their contributions have been properly limited. This allows the reduction of the power consumption while satisfying the application requirements. The filter is realized in 0.7-μm BiCMOS technology with an active area of about 1.3 mm2 . A total harmonic distortion (THD) of -75 dB for a full scale input signal and an SNR of 96 dB have been achieved. The power consumption of the filter has been maintained within about 40 mW from a single 5-V supply voltage
Keywords :
BiCMOS analogue integrated circuits; Hi-Fi equipment; codecs; digital-analogue conversion; harmonic distortion; integrated circuit noise; low-pass filters; switched capacitor filters; 0.7 micron; 16 bit; 40 mW; 5 V; 96 dB; BiCMOS switched-capacitor filter; audio codec applications; distortion sources; fourth-order filter; low-power BiCMOS SC filter; noise sources; oversampled D/A converter; power consumption reduction; stereo codec; Band pass filters; BiCMOS integrated circuits; Codecs; Energy consumption; Finite impulse response filter; Frequency; Low pass filters; Power harmonic filters; Signal processing; Total harmonic distortion;
Journal_Title :
Solid-State Circuits, IEEE Journal of
