Trifferential amplifier and trifferential amplifier system

A multi-fferential amplifier system includes an amplifier having a plurality of amplifier inputs and a plurality of amplifier outputs; a plurality of input terminals for receiving a plurality of inputs and being interconnected with the amplifier inputs through a plurality of input impedances, respectively, and a feedback network including a plurality of summing circuits for combining the plurality of amplifier outputs in a plurality of different sets of groups each group numbering one fewer than the plurality, respectively, and feeding back the sum of each group of amplifier outputs to the remaining amplifier input for maintaining the difference between any group of amplifier outputs proportional to the difference of a corresponding group of inputs at the terminals and maintaining the average value of the amplifier outputs constant and unrelated to the inputs at the terminal. Also disclosed is a multi-fferential amplifier including a plurality of differential input/output circuits responsive to a plurality of input signals and providing a plurality of output signals; each input signal is shared between a different set of differential input/output circuits in a plurality of different sets of groups, each group numbering one fewer than the plurality; each differential input/output circuit receives one input signal at its positive input and the other input signal at its negative input.