Title :
CMOS analog front-end for conversational video phone modem
Author :
Solomon, C.W. ; Ozcolak, L. ; Sellani, G. ; Brisco, W.E.
Abstract :
A description is given of an analog front-end chip relating to a video phone for transmission of audio signals and freeze-frame video images over voice-grade telephone lines. The device is implemented in a 3-μm CMOS process, utilizes switched-capacitor circuit technology and contains major functional blocks, such as a synchronous demodulator, transmit/receive filters, baseband and interpolating filters, an 8-bit digital-to-analog converter, a programmable gain amplifier, and clock and carrier recovery circuits. The chip occupies 27000 mil2 and dissipates 100 mW. System and circuit aspects of the design are discussed
Keywords :
CMOS integrated circuits; modems; switched capacitor networks; videotelephony; 100 mW; 3 micron; CMOS analog front-end; audio signals; carrier recovery circuits; conversational video phone modem; digital-to-analog converter; freeze-frame video images; interpolating filters; programmable gain amplifier; switched-capacitor circuit technology; synchronous demodulator; transmit/receive filters; voice-grade telephone lines;
Conference_Titel :
Custom Integrated Circuits Conference, 1989., Proceedings of the IEEE 1989
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/CICC.1989.56706
