A current-mode analog multiplier using a negative resistance transconductance technique

A current-mode multiplier based on a negative resistance transconductance circuit is proposed as the input stage for the Gilbert transconductance multiplier circuit. Compared with the input stage of the standard Gilbert multiplier which is based on an emitter degenerated long-tail pair, the negative resistance transconductance cell provides better linearity, accuracy and noise performance. Also the gain of the overall circuit is significantly higher. (6 pages)