The MRFIC2101 is a high linearity transmit mixer and exciter designed primarily for Digital Cellular radio systems. The mixer is double-balanced for excellent LO and spurious rejection. An on-board LO buffer is provided to reduce LO power requirements and eliminate the need for an external LO balun. A power down control is provided to minimize current drain with minimum recovery/turn-on time. The design utilizes Motorola's advanced MOSAIC 3 silicon bipolar RF process to yield superior performance in a cost effective monolithic device.