Radio-frequency Power Detector with Offset and Temperature Compensation

A power detector configured to measure a power of a radio-frequency signal, comprising:

• a rectifier configured to receive the radio-frequency signal;
• a comparator having a first input coupled to the rectifier over a first signal line and having a second output coupled to the rectifier over a second signal line, the rectifier being configured to output a first voltage on the first signal line and a second voltage on the second signal line;
• and
• a digital-to-analog converter (DAC) on the second signal line, the DAC being configured to
• add a first offset voltage to the second voltage at a first time, and
• add a second offset voltage to the second voltage at a second time, the second offset voltage being different than the first offset voltage.

A power detector configured to measure a power of a signal, comprising:

• a rectifier configured to receive the signal;
• a first signal line coupled to a first output of the rectifier;
• a second signal line coupled to a second output of the rectifier;
• a comparator having a first input coupled to the first signal line and having a second input coupled to the second signal line;
• a digital-to-analog converter (DAC) on the second signal line;
• a reference generator on the second signal line between the DAC and the second input of the comparator;
• a multiplexer on the second signal line between the reference generator and the second input of the comparator;
• digital logic operably coupled to the comparator and the multiplexer and configured to output a digital code indicative of the measured power;
• and
• a low pass filter on the first signal line.