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LTC5597 RF Detector Demonstration Circuit

The LTC5597, from Analog Devices, is a high accuracy RMS power detector that provides a very wide RF input bandwidth, from 100MHz up to 70GHz. This makes the device suitable for a wide range of RF and microwave applications, such as point-to-point microwave links, instrumentation and power control applications.

The DC output voltage of the detector is an accurate representation of the average signal power applied to the RF input. The response is linear-in-dB with 28.5mV/dB logarithmic slope over a 35dB dynamic range with typically better than ±1dB accuracy. The detector is particularly suited for measurement of waveforms with crest factor (CF) as high as 12dB, and waveforms that exhibit a significant variation of the crest factor during measurement.

To achieve higher accuracy and lower output ripple, the averaging bandwidth can be externally adjusted by a capacitor connected between the FLTR and OUT pins. The enable interface switches the device between active measurement mode and a low power shutdown mode.

Key Features and Benefits

• RMS detection up to 70GHz: Waveform insensitive measurement; no other device in market operating up to 70GHz
• -37dBm sensitivity; ability to measure signals down to -37dBm, About 10dB better than any Schottky device; can save an (expensive) amplifier in the signal path
• +/-2dB flat frequency response up to 60GHz, Enables accurate measurement of very broadband signals, minimizes need for calibration (single frequency may be sufficient)

Applications

• Instrumentation: 5G (cell phone) testers (DIN Acorn), signal generators, power meters
• Communications: Satellite communications (particularly Q-band and V-band), Pt-pt links, 5G radios
• Aerospace and Defense: Microwave radios