Receiver calibration with LO signal from inactive receiver

摘要

Techniques for calibrating a receiver based on a local oscillator (LO) signal from another receiver are disclosed. In an exemplary design, an apparatus (e.g., a wireless device or an integrated circuit) includes first and second local oscillator (LO) generators. The first LO generator generates a first LO signal used by a first receiver for frequency downconversion. The second LO generator generates a second LO signal used by a second receiver for frequency downconversion in a first operating mode. The second LO signal is used to generate a test signal for the first receiver in a second operating mode. The second LO signal may be provided as the test signal or may be amplitude modulated with a modulating signal to generate the test signal. The test signal may be used to calibrate residual sideband (RSB), second order input intercept point (IIP2), receive path gain, etc.

主权项

1. An apparatus comprising:
a first local oscillator (LO) generator configurable to generate a first LO signal used by a first receiver for frequency downconversion; and a second LO generator configurable to generate a second LO signal used by a second receiver for frequency downconversion in a first operating mode and used to generate a test signal for the first receiver in a second operating mode, the test signal coupled to the first receiver exclusive of an antenna.