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Frequency generator and gain calibration technique for two-point modulation in a phase-locked loop
Frequency generator and gain calibration technique for two-point modulation in a phase-locked loop
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机译:锁相环中用于两点调制的频率发生器和增益校准技术
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摘要
A frequency generator includes a phase-locked loop (PLL) and a voltage controlled oscillator (VCO), where the VCO is arranged to receive low-pass data via a first input and high-pass data at a second input. The first input is coupled to a first set of varactors in the VCO. The second input is coupled to a second set of varactors in the VCO. A controller sets the input voltage at the first input and directs a charge pump to operate in a tri-state mode that opens the feedback loop of the PLL. The controller applies different voltages via the second input and measures the change in output frequency. A present gain of the VCO is determined from the ratio of the change in frequency and the change in voltage at the second input and is used to calibrate a portable transceiver.
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