This application note describes the CN-0187 circuit design for measuring peak and RMS power of RF signals from 450 MHz to 6 GHz.
The document details a tested circuit design (CN-0187) intended for high-speed, low-power RF power measurement applications. It measures peak and root-mean-square (RMS) power over a frequency range of 450 MHz to 6 GHz with a dynamic range of approximately 45 dB. The results are converted into differential signals to eliminate noise and digitized by a 12-bit SAR ADC.
The circuit utilizes specific components including the ADL5502 peak factor detector, ADA4891-4 amplifier, AD7266 ADC, and ADP121 regulator. The note provides descriptions of these components' functions within the system, such as the ADL5502's ability to measure true RMS power and capture short peaks, and explains the calibration process required for accurate measurements.
The circuit measures peak and rms power for any RF frequency from 450 MHz to 6 GHz.
The circuit provides a dynamic range of approximately 45 dB.
To initialize the device, the control line must be set to logic high for more than 1 microsecond.