A high speed 880 channel digital interpolator network

A high speed 800 channel digital interpolator network has been designed. The interpolator network accepts data from the demultiplexer onboard a satellite which separates 800 telephone channels from ground stations in an FDMA format into individual channels in a TDM format at 45 ksamples/sec/ch. The interpolator then changes the sampling rate of the data input to 64 ksamples/sec/ch so that the demodulator onboard the satellite can correctly demodulate all of the 800 channels with a requirement of two samples/symbol data rate. An interpolator network has been implemented using 0.8 micron CMOS technology and is suitable for real time processing.