Patent ID: 9118396
Filing Date: 2015-08-25
Classification: H04B

Abstract:
1. A wireless communication device configured for reducing transmit leakage in a received signal, comprising: a transceiver chip, comprising: a receiver configured to receive the received signal; a transmitter comprising a local oscillator; a feedback receiver coupled between the transmitter and the receiver, the feedback receiver comprising a feedback low-noise amplifier coupled to a feedback downconverter, the feedback downconverter coupled to a feedback baseband filter, and the feedback baseband filter coupled to a receive analog-to-digital converter, wherein the feedback receiver provides periodic feedback about power levels of the transmitter; and a transmit leakage signal reduction module comprising a notch filter coupled to a first amplifier, wherein the first amplifier provides a feedback signal to the feedback downconverter, wherein the transmit leakage signal reduction module reuses the feedback receiver to tune circuitry to reduce transmit leakage in the received signal, and wherein the notch filter receives the reduced transmit leakage outputted from the receive analog-to-digital converter when the feedback receiver is not providing feedback about power levels of the transmitter.