Title :
PCM telephony: reduced architecture for a D/A converter and filter combination
Author :
Senderowicz, Daniel ; Nicollini, Germano ; Confalonieri, Pierangelo ; Crippa, Carlo ; Dallavalle, Carlo
Author_Institution :
SynchroDesign Inc., Berkeley, CA, USA
fDate :
8/1/1990 12:00:00 AM
Abstract :
Large dynamic range and high power-supply rejection ratio (PSRR) are achieved in a pulse-code-modulation (PCM) decoder by using differential circuit techniques and by reducing the number of operational amplifiers on the interpolation filter to four (including the output buffer). This reduction is achieved by: (1) exploiting the sin x/x distortion and using a simple integrating configuration in the digital-to-analog converter; and (2) properly manipulating the signal flowgraph of the filter
Keywords :
CMOS integrated circuits; codecs; decoding; digital-analogue conversion; pulse-code modulation; switched capacitor filters; telephone station equipment; D/A converter; DAC/filter combination; PCM telephony; codec chip; decoder; differential circuit techniques; digital-to-analog converter; dynamic range; high power-supply rejection ratio; integrating configuration; interpolation filter; op amps-reduction; operational amplifiers; pulse-code-modulation; reduced architecture; signal flowgraph; Decoding; Differential amplifiers; Dynamic range; Filters; High power amplifiers; Operational amplifiers; Phase change materials; Pulse amplifiers; Pulse circuits; Telephony;
Journal_Title :
Solid-State Circuits, IEEE Journal of
