Charge pump construction for phase lock loop circuit
A charge pump and phase-locked loop technology, applied in the field of phase-locked loop circuit charge pump structure, can solve the problems of loss of lock, phase-locked loop output signal jitter, phase-locked loop noise, etc., to achieve small errors, reduce the degree of mismatch, The effect of eliminating the influence of parasitic capacitance
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[0027] Such as Figure 4 As shown, the present invention discloses a charge pump structure for a phase-locked loop circuit, which includes two identical single-ended variable differential signal buffer units to generate two complementary differential signals from the Up and Down signals, and Their gate delay and connection delay are the same, and a symmetrical and balanced charge pump. The switch tube of the charge pump is controlled by the differential signal of the buffer unit. The Up and Down signals generated by the phase discriminator unit of the frequency discriminator are first passed through the differential signal. The generating unit generates two pairs of differential signals S1, S3 and S2, S4, and then controls the switch tube of the charge pump unit.
[0028] Figure 5 It is a specific circuit block diagram of the differential signal generating unit of the phase-locked loop circuit of the present invention, which includes a circuit composed of two sets of the same gat...
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