RECEIVER INCLUDING AN OSCILLATION CIRCUIT FOR GENERATING AN IMAGE REJECTION CALIBRATION TONE

摘要

A receiver circuit includes an oscillator circuit (100) configured to generate a calibration tone (75) and a phase locked loop (PLL) reference signal (72). An output frequency of the VCO (172) may be divided by respective amounts to derive a desired calibration tone frequency and a desired PLL reference signal frequency. In addition to the oscillator circuit, the receiver circuit may further include a phase locked circuit (60) configured to generate a PLL output signal (61) that is phase locked in relation to the PLL reference signal (72). During a calibration mode, a quadrature generator (26) may be used to generate quadrature mixer local oscillator signals dependent upon the PLL output signal (61), and an in-phase/quadrature mixer (25) may be used to mix the calibration tone (65) with the quadrature mixer LO signals.