HIDDEN RECEPTION MONITORING DURING A SIGNAL RECEPTION OPERATION

摘要

A radio frequency circuit includes an input terminal configured to receive a reception signal from an antenna; a reception signal path coupled to the input terminal and including a mixer and an analog-to-digital converter (ADC), where the ADC generates a digital signal representing an input signal to the ADC; a test signal generator configured to generate a test signal that is injected into the reception signal path while the reception signal propagates along the reception signal path; a digital signal processor configured to receive the digital signal from a digital portion of the reception signal path, and analyze a frequency response of the digital signal; and a subtractor coupled to the digital portion of the reception signal path, the subtractor configured to remove test frequency components resulting from an injection of the test signal into the reception signal path from the digital signal.