Title :
A CMOS subscriber line audio processing circuit including adaptive balance
Author :
Poole, S.J. ; Surace, G. ; Singh, B. ; Dyer, N.P.
Author_Institution :
Plessey Co. plc., Swindon, UK
Abstract :
The design of a CMOS subscriber-line audio processing circuit including self-adaptive trans-hybrid balance has been described. Its transmission performance has been shown to exceed CCITT specifications with up to 12 dB of transmit gain and receive loss. This has been achieved using a single 5-V power supply while maintaining simple analog interfaces to a subscriber line interface circuit. This circuit will enable the design of programmable and flexible line cards, superior transmission performance over those realized with more conventional components.<>
Keywords :
CMOS integrated circuits; audio signals; signal processing equipment; subscriber loops; telephone equipment; 12 dB; CMOS circuit; adaptive balance; design; receive loss; subscriber line audio processing circuit; transmission performance; transmit gain; Adaptive filters; CMOS process; CMOS technology; Circuits; Digital filters; Dynamic range; Filtering; Manufacturing; Phase change materials; Propagation losses;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo, Finland
DOI :
10.1109/ISCAS.1988.15316
