Ultra-wideband 3 to 20-GHz mixer supports DC to 6 GHz IF

August 15, 2017 //By Graham Prophet
Ultra-wideband 3 to 20-GHz mixer supports DC to 6 GHz IF
LTC5552 is a double balanced mixer for up- or down-conversion that features wideband matching from 3 GHz to 20 GHz and needs only 0-dBm LO (local oscillator) drive, in a 3 x 2 mm package. In upconversion applications its DC capable differential IF port enables the LO to be close in frequency to the RF.

The mixer’s low LO to RF leakage of less than –25 dBm simplifies external filtering. The mixer delivers linearity of 20.1 dBm IIP3 at 14 GHz, and 18.3 dBm at 17 GHz. The device integrates a broadband LO buffer, requiring only 0 dBm drive and effectively eliminating an external high power LO amplifier circuit. Conversion loss is specified at 10.8dB at 17GHz. It integrates a wideband balun transformer in its RF port, allowing single-ended 50Ω matched operation over its frequency range. All these features result in minimum external components, simplified design and a very small solution size.


The LTC5552’s wide bandwidth and performance is suited to a broad range of applications, including 5G broadband wireless access, microwave backhaul, satellite broadband radios, radar systems, active antenna arrays, X, Ku and Ka band transceivers, RF test equipment, spectrum analysis and satellite communications. The device comes in a 12-lead, 3 x 2 mm plastic QFN package, rated from –40°C to 105°C case temperature to support extended environmental operating temperatures. The mixer is powered from a single 3.3V supply and typically consumes 132 mA supply current. LTC5552 can be shut down via an enable pin. When deactivated, the device draws 100 μA maximum standby current. The enable pin can also be driven directly to turn the device on and off rapidly in less than 0.2 μsec, supporting time-division duplex (TDD) or burst mode type transmitters and receivers. The LTC5552 is priced starting at $22.00 (1,000)


Linear Technology/Analog Devices; www.linear.com/product/LTC5552


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