Abstract: A voltage to current converter, voltage multiplier and mixer circuit. At least two differential output, common source, pairs of matched field effect transistors have cross connected drains. Those transistors which do not have their drains connected together have their gates connected together to form a first pair of voltage input nodes. The two cross connections form output nodes providing differential output currents. A pair of impedance transformation, low output impedance, buffer amplifiers have bipolar transistor output stages and a high input field effect transistor input stage. The outputs of the output stages are each respectively connected to a different one of the common sources of the differential connected pairs. The input nodes of the input stages form a second pair of voltage input nodes.

Abstract: A four quadrant, analog multiplier circuit useful for MOS implementation of feedback/feedforward neural networks. The multiplier circuit uses only one op-amp and one pair of input MOS FETs. It becomes a multiplier/summer by the addition of only one additional pair of input FETs for each additional product to be summed and achieves the vector scalar product of 2 n-tuple vector inputs using only 2(n+1) MOS transistors.