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Применения > > Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System

Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System (cn0178)

This circuit uses the ADL5902 TruPwr™ detector to measure the rms signal strength of RF signals with varying crest factors (peak-to-average ratio) over a dynamic range of approximately 65 dB and operates at frequencies from 50 MHz up to 9 GHz.


The measurement result is provided as serial data at the output of a 12-bit ADC (AD7466). A simple 4-point system calibration at ambient temperature is performed in the digital domain.

The interface between the RF detector and the ADC is straightforward, consisting of two signal scaling resistors and no active components. In addition, the ADL5902 internal 2.3 V reference voltage provides the supply and reference voltage for the micropower ADC. The AD7466 has no pipeline delay and is operated as a read-only SAR ADC.


The overall circuit achieves temperature stability of approximately ±0.5 dB.


Data is shown for the two devices operating over a −40°C to +85°C temperature range.



Figure 1. Software-Calibrated RF Power Measurement System

Возможности

  • Wideband frequency range from 50MHz to 9GHz
  • 65 dB dynamic range
  • Calculates crest factor, RMS, and peak signal levels

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Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System  cn0178

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