Monolithic payload IF switch

A crosspoint switch architecture. The inventive architecture includes a monolithic substrate on which a plurality (N) of electrical inputs are provided. In addition, a plurality (M) of electrical outputs are provided on the substrate. A switch is disposed on the substrate for selectively interconnecting the inputs to the outputs and a control circuit is disposed on the substrate for controlling the switch. The switch comprises M, N to , multiplexers, each multiplexer being adapted to receive each of the N electrical inputs. In the illustrative embodiment, each of the N inputs to each of the multiplexers is received through a respective one of N switchable amplifiers. The output of each amplifier is provided to a respective one of N switchable isolation buffers. The outputs of the buffers are summed and buffered to provide the output of each multiplexer. The control circuit selects which input is to be passed through to the output of a given multiplexer. In the illustrative embodiment, the control circuit includes a serial in, parallel out shift register and decode logic circuitry.