Hittite Microwave Corp. has released a broadband SMT-packaged gallium arsenide (GaAs) MMIC single-pole, double-throw (SPDT) switch and a SMT-packaged GaAs MMIC voltage variable attenuator(VVA). Both are designed for fiber-optic, wideband telecom, test and measurement, microwave radio and military applications from DC to 20.0 GHz. The HMC547LP3 is a GaAs MMIC non-reflective SPDT switch in a low-cost leadless QFN 3 mm x 3 mm surface-mount package. Operating from DC to 20 GHz, this switch offers isolation as high as 50 dB and insertion loss as low as 1.5 dB. The HMC547LP3 is controlled by two complementary negative voltage logic lines and requires no DC bias supply. A high input IP3 of +48 dBm and a fast switching speed of 6 ns allow this switch to be used in numerous applications. An RoHS-compliant version of the switch is available as the HMC547LP3E.

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The HMC346LC3B is an absorptive GaAs MMIC VVAin a Pb-free RoHS-compliant 3 mm x 3 mm leadless surface-mount package and is rated from DC to 18 GHz. With up to 30 dB of attenuation range, this VVA is matched to 50 Ohms at all attenuation levels and offers a low phase shift vs. attenuation characteristic. The on-chip reference attenuator is designed to be used with an external op-amp for applications where a single control voltage of 0 to -3 V is desired.

Samples of these wideband control devices and evaluation PC boards are available from stock and can be ordered on line.