RADIO-FREQUENCY POWER DETECTOR WITH NON-LINEARITY CANCELLATION

Wireless circuitry can include a radio-frequency amplifier and a power detection circuit (70) coupled to an output of the radio-frequency amplifier. The power detection circuit (70) can include an input transistor (110), a biasing circuit (156, 158, 160) configured to output a bias voltage for the input transistor (110) and configured to track temperature and voltage variations, and a non-linearity cancellation component (150) configured to generate a current that at least partially cancels a non-linear current associated with the input transistor (110). The input transistor (110) may be an n-type transistor, and the non-linearity cancellation component (150) may be a p-type metal-oxide-semiconductor capacitor. The biasing circuit (156, 158, 160) can include n-type and p-type diode-connected bias transistors.