A 100MHz 4mW Four-Quadrant BiCMOS Analogue Multiplier

An analogue four-quadrant multiplier based on a simple, highly linear and fast BiCMOS transconductor using MOS transistors operating in the triode region and vertical npn bipolar is presented. The four quadrant operation is obtained by cross-coupling in a Gilbert-cell fashion two transconductors and using a third stage to modulate the transconductance of the former two. A chip prototype has been designed to obtain high linearity on both inputs and high speed of operation up to a 3V supply voltage and 4mW dissipated power. It has been integrated in a 1.2¿m BiCMOS process.