MMIC broadband passive frequency doubler from 7- to 11-GHz

MMIC broadband passive frequency doubler from 7- to 11-GHz

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By Jean-Pierre Joosting

The doubler covers an input frequency of 7 GHz to 11 GHz input frequency (C-, and X-band input; Ku- and K-band output). This doubler’s low conversion loss and excellent Fo isolation make it ideal for use in military radar, SMDS, SATCOM, VSAT, and LO chains for point-to-point microwave/millimeter-wave radio in cellular backhaul applications.

The GaAs MMIC CMD226N3 is a x2 passive frequency multiplier that offers broadband performance and is housed in a QFN-style package. With a drive level of +15 dBm, this frequency doubler offers 9.0 dBm of conversion loss at 18 GHz and Fo Isolation in reference to an input level of 44 dB. The 3Fo and 4Fo isolation are at least 48 dBc and 50 dBc, respectively.

Extremely temperature stable, the conversion gain varies less than 2 dB from nominal across the entire frequency band of operation, and is also very stable under varying drive conditions. The passive design exhibits excellent phase noise performance, without the need for biasing circuitry. It also incorporates a 50 ohm matched design on chip–removing the necessity to RF port match this device.

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