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Log Detectors

Log detectors convert RF or microwave input level into a logarithmic output voltage across a wide dynamic range. They are used for received-signal indication, power leveling, AGC feedback and RF monitoring paths.

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Log detector module for RF level measurement

FAQ

How should RF P1dB and two-tone intermodulation tests differ?

P1dB is a single-tone gain-compression sweep, while two-tone IMD measures nonlinear mixing products with stated tone spacing, per-tone power and system residual checks; the results answer different questions.

What is an RF measurement reference plane, and when is fixture de-embedding required?

The measurement reference plane is the electrical boundary where a corrected value is claimed; de-embedding is needed only when a characterized fixture network must be removed to report at a different DUT plane.

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Log detectors

Log detectors translate changes in RF or microwave input level into a compressed output response, usually expressed as voltage per dB. This makes them useful when the system must observe a large signal range without switching between multiple detector paths.

Wide-range RF level indication

Key data includes frequency range, input level range, usable dynamic range, log slope, intercept, linearity error, output settling time, video bandwidth, input match and temperature drift. These values affect RSSI-style outputs, power leveling, AGC loops, receiver monitoring and test fixtures that need repeatable level information over a broad range.