A phase detector for a multi-channel PSK receiver is provided with a plurality of phase channels. Each of the phase channels has its own comparator coupled to an electronic switch for producing signals which are the products of the analog data inputs on the phase channels. The outputs from the electronic switches are connected to positive and negative summing circuits and the output of the positive and negative summing circuits are connected to the positive and negative inputs of a differential amplifier which produce a sum of the difference of the absolute value of the analog data inputs which is employed as an error voltage signal to control the frequency of a voltage controlled oscillator in a multi-channel PSK receiver. By eliminating convention analog multipliers in the phase detector, the phase detector is capable of generating error voltage signals from analog data input signals having data rates as high as 5 gigabytes per second.
