Ideal for clock generation, microwave radio and test equipment applications, Hittite's new GaAs MMIC active x 2 frequency multiplier chip will enable designers to achieve continuous output frequency coverage from 22 to 46 GHz. This new device also provides excellent fundamental and subharmonic suppression in point-to-point radio, military and space, and VSAT.

The HMC598 active x2 frequency multiplier is fabricated using GaAs PHEMT technology and is offered in bare die form. The device comprises an input amplifier, a low-conversion loss, frequency doubler and an output buffer amplifier. When driven with a +5-dBm input signal, this frequency multiplier provides +15-dBm typical output power over the range of 22 to 46 GHz. Fo and 3Fo isolation are -25 dBc and -15 dBc, respectively at 30 GHz. The high output power capability of the HMC598 also enables designers to drive, directly, many of Hittite's double-balanced and I/Q MMIC mixer products.

The HMC598 active x2 frequency multiplier may be used to develop clock-generation circuits implementing OC-768 and STM-256 optical standards. It is also well suited for use in LO multiplier chains for point-to-point and millimeter-wave radios. The device requires no external components, other than standard bias decoupling capacitors. However, such a design will yield a reduced parts count compared with traditional design approaches.

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