In a recent blog post on omzlo.com, [Alain] explains how they found a bug in the Arduino SAMD21 analogRead() code which causes the output to be offset by between 25 mV and 57 mV. For a 12-bit ADC ...
The circuit will output about 0dBm into 50 ohms. The power detector is an Analog ... from very low frequencies to 500MHz. [Brett] uses a Python program to process the data from the Arduino.
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