ANALOG FRONT END OF AN ECBM TRANSCEIVER FOR ISDN

The analog front end of an echo cancellation burst mode (ECBM) transceiver operating from a single 5-V supply is described. The chip performs pulse shaping and line driving in the transmit section and hybrid function, equalization, A/D and D/A conversion, automatic gain control, threshold detection for PLL, and wake-up in the receive section. The chip dissipates about 160 mW in the normal operation mode and 5 mW in the power-down mode. The die area is 50000 mil2 in a 2-μm, double-poly, single-metal CMOS technology. © 1990 IEEE