A millimeter-wave multifunction HEMT mixer

A monolithic chip with a single 80 μm HEMT device, 1.25×3.0 mm ² in size, has been tested as both a fundamental and a subharmonic mixer. With input filter networks for K- and Q-bands providing two separate radio frequency/local oscillator (RF/LO) channels to the gate, the chip produces an IF signal from DC to 4 GHz at the drain. The mixer...