A phase-locked loop circuit for suppressing vco voltage ripple
A technology of voltage ripple and phase-locked loop, applied in the direction of electrical components, automatic power control, etc., can solve the problems of deteriorating phase-locked loop phase noise, VCO control voltage fluctuation, charge injection clock, etc., to reduce charge injection and Effect of clock feedthrough, suppression of VCO voltage ripple, and reduction of VCO voltage ripple
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[0030] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0031] Such as image 3 As shown, a phase-locked loop circuit for suppressing VCO voltage ripple, including: frequency detector, charge pump, automatic frequency band selector, loop filter, voltage controlled oscillator, frequency divider and the first Portal.
[0032] The reference input terminal of the frequency and phase detector is connected to the external reference source, and the feedback input terminal of the frequency and phase detector is connected to the output terminal of the frequency divider to receive the reference signal and the feedback signal respectively, thereby generating a discrete voltage pulse signal.
[0033] The UP input of the charge pump is connected to the UP output of the frequency and phase detector, ...
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