Invention Grant
US08681838B2 Electronic device with VCO pulling compensation circuit for an input baseband signal and associated methods 有权
具有VCO拉电阻的电子装置用于输入基带信号和相关方法

Electronic device with VCO pulling compensation circuit for an input baseband signal and associated methods
Abstract:
An electronic device includes a transmitter with a baseband input for a baseband signal, a mixer downstream from the baseband input, and a phase-locked loop (PLL) having a voltage controlled oscillator (VCO) and a phase detector coupled thereto, the VCO coupled to the mixer. A power amplifier is downstream from the mixer, and generates at least one aggressing signal that would otherwise generate an output pull of the VCO, causing transmit distortion on a transmit signal. A receiver is coupled to the power amplifier and has a sense input configured to receive the transmit signal. A VCO pulling compensation circuit is coupled to the baseband input and is configured to compensate the at least one baseband signal for the transmit distortion based upon the sensed transmit signal.
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