Method And System For A Wideband CMOS RMS Power Detection Scheme

A system comprising:

• a) a first circuit comprising a first metal oxide semiconductor (MOS) transistor having a gate for receiving a radio frequency (RF) signal and having a drain for outputting a first current that is proportional to a square of a voltage of the RF signal in response to receiving the RF signal;
• and
• b) a second circuit connected to the first circuit, the second circuit comprising a second MOS transistor having a source for receiving the first current from the first circuit,
• wherein the second circuit outputs a voltage proportional to a power of the RF signal received by the first circuit, the output voltage being a function of the first current and a channel resistance of the second MOS transistor.

A method of detecting the power of an RF signal, comprising:

• a) generating a first current proportional to a square of a voltage of the RF signal in response to receiving the RF signal at a gate of a metal oxide semiconductor (MOS) transistor of a first circuit;
• b) generating a second current in a second circuit, the second current being proportional to the square of the voltage of the RF signal;
• c) receiving the second current at a source of a second MOS transistor;
• and
• d) outputting a second voltage from the second circuit, the second voltage being proportional to a power of the RF signal received by the first circuit and being a function of the second current and a channel resistance of the second MOS transistor.