Abstract
A CMOS power detector is proposed for power monitoring of transceivers in mm-Wave beamforming systems. The power detector outputs a voltage in a log-linear relationship with respect to the RF input power. To improve voltage response at low RF input power, the transistor is designed to operate in the sub-threshold region. The proposed power detector has a linear output voltage response characteristic with a slope of −20 mV/dB for RF input signal power in the range of −15 dBm to 11 dBm. For frequencies above 10 GHz, the log-linearity dynamic range of the power detector is 26 dB, with a log-linearity error within ± 1 dB in this range. The proposed power detector can be used to monitor the output signal strength of the transmit/receive channel in the mm-Wave beamforming system.
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