A Single Chip 5 Volt 2400 Bps Modem

A single-chip 2400 bps modem which has been implemented in a 3.6 μm Si gate CMOS process will be described. An analog front end (AFE) and digital signal processor (DSP) are included on the IC. The transmit-side and part of the receive-side signal processing are performed in the analog domain. The DSP is dedicated to receive signal processing - timing recovery, adaptive equalization, carrier recovery/demodulation and decoding. The chip operates off a single 5 V supply, occupies 68.8 mm² and dissipates 120 mW. The design and performance of the IC will be presented.