HMMC-1002

The HMMC-1002 is designed to be used as a gain control block in an AGC assembly. Because of its wide dynamic range and return loss performance, the HMMC-1002 may also be used as a broadband pulse modulator or single-pole single-throw, nonreflective switch.

The HMMC-1002 is a monolithic, voltage variable, GaAs IC attenuator that operates from DC to 50ÊGHz. It is fabricated using MWTC's MMICB process which features an MBE epitaxial layer, backside ground vias, and FET gate lengths of approximately 0.4Êmm. The variable resistive elements of the device are two 750 mm wide series FETs and four 200 mm wide shunt FETs. The distributed topology of the HMMC-1002 minimizes the parasitic effects of its series and shunt FETs, allowing it to exhibit a wide dynamic range across its full bandwidth. An on-chip DC reference circuit may be used to maintain optimum VSWR for any attenuation setting or to improve the attenuation versus voltage linearity of the attenuator circuit.