APPARATUS AND METHODS FOR CALIBRATING RADIO FREQUENCY TRANSMITTERS TO COMPENSATE FOR COMMON MODE LOCAL OSCILLATOR LEAKAGE

Apparatus and methods for calibrating radio frequency transmitters to compensate for common mode local oscillator leakage are provided herein. In certain configurations herein, a transmitter generatesa radio frequency transmit signal based on mixing a baseband input signal with a local oscillator signal. The transmitter is calibrated to compensate for common mode local oscillator leakage. Thus, acommon mode component of the local oscillator signal is reduced or eliminated from the radio frequency transmit signal, which provides a number of benefits, including lower levels of undesired emissions from the transmitter. 本文提供了用于校准射频发射器以补偿共模本地振荡器泄漏的装置和方法。在本文的某些构造中，发射器基于混合基带输入信号和本地振荡器信号产生射频发射信号。校准发射器以补偿共模本地振荡器泄漏。因此，本地振荡器信号的共模分量从射频发送信号中减少或消除，这提供了许多益处，包括来自发射器的较低水平的不希望的发射。