A 0.9-p CMOS VLSI device was designed and developed to perform as an adaptive transversal equalizer for digital radio. The device contains an 1 l-tap multiply-add structure complete with control hardware for 12-bit coefficients. Void of any pipelining, the device is guaranteed for 27-MHz operation, and has demonstrated speeds in excess of 40 MHz. Physical and electrical characteristics of the device are described, along with its application to digital radio.A digital radio modem has been designed by AT&T using the VLSI device and is now being manufactured for a 64-QAM 4-GHz radio system. Important modem characteristics are presented, including S/N performance, dispersive fade performance, and modem acquisition.
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