Broadband passive frequency doubler offers excellent fundamental isolation

Custom MMIC has announced a new edition to their growing line of high performance MMIC doublers, the CMD226N3 broadband frequency doubler. The doubler covers an input frequency of 7GHz to 11GHz input frequency (C-, X, input; Ku-, and K-band output). This doubler’s low conversion loss and excellent Fo isolation make it ideal for use in defence radar, SMDS, SATCOM, VSAT, and LO chains for point-to-point microwave/millimeter-wave radio in cellular backhaul applications. The device is a x2 passive frequency multiplier that offers broadband performance and is housed in a QFN-style package. With a drive level of +15dBm, this frequency doubler offers 9dBm of conversion loss at 18GHz and Fo Isolation in reference to an input level of 44dB. The 3Fo and 4Fo isolation are at least 48dBc and 50dBc, respectively. Extremely temperature stable, the conversion gain varies less than 2dB from nominal across the entire frequency band of operation, and is also very stable under varying drive conditions. The device’s passive design exhibits excellent phase noise performance, without the need for biasing circuitry. It also incorporates a 50ohm matched design on chip--removing the necessity to RF port match this device.