Test & Measurement

Log video amplifiers cover 0.5-18GHz multi-octave bandwidths

30th April 2015
Siobhan O'Gorman

A line of broadband log video amplifiers, covering multi-octave bandwidths from 0.5 to 18GHz, has been released by Pasternack. The line includes four successive detection log video amplifiers and one detector log video amplifier, which offer a wide input dynamic range, high signal sensitivity, fast recovery times and outstanding temperature stability. 

The devices can be used to measure widely varying signals at high frequencies in applications where rapid and precise tracking is required across the entire frequency band. Signals with high density pulses, narrow pulse widths and large amplitude variations are compressed into an output video voltage response that increases linearly with increasing input power. The amplifiers are suitable for radar and EW systems used for direction finding and power monitoring, as well as laboratory measurement and test equipment and telecomms and data comms systems.

The log video amplifiers utilise GaAs semiconductor technology, while maintaining flatness and accuracy throughout the desired frequency band. The devices can process up to 75dB of dynamic range and have log linearity that ranges from ±1 to ±2.5dBm. Boasting fast recovery times of 40-150ns, the log slope ranges from 20 to 50mV/dB. Designed to meet MIL-STD-202Fenvironmental conditions, the 50Ω hybrid circuit assemblies are enclosed in rugged metal packages with SMA connectors.

“Processing complex RF and microwave signal responses and measuring the results can prove to be very challenging. This selection of log video amplifiers which cover multi-octave microwave frequency bands can support applications which require processing and tracking of widely varying signals into a usable state that’s precise and accurate,” says Tim Galla, Product Manager, Active RF Components, Pasternack.

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