The offset system for the phase jump in the loop gain changes in the fractional frequency division type frequency synthesizer

摘要

A phase detector, a variable current charge pump, a loop filter to provide tuning signals, for providing a VCO output signal, fractional division frequency synthesizer having a cancellation system for the phase discontinuity caused by the loop gain changes, tuning may include a divider for the voltage controlled oscillator controlled by a signal (VCO), resulting in the divided VCO signal, and a modulator for generating a modulated signal for a fractional frequency divider is, and a second input for receiving a first input for receiving a reference signal that oscillates at a reference frequency, the divided signal, the phase detector and a phase detector, a charge pump , and is constructed by comparing the phase of the input of the second phase of the first input, to turn on / off the current of the charge pump, cancellation system, additional inputs as defined by the current value of the variable charge pump and characterized in that it is implemented within the modulator which has a.