Low-power-consumption high-switching-rate charge pump circuit

Abstract

The invention discloses a low-power-consumption and high-switching-rate charge pump circuit, which utilizes a structure similar to a current source, so that the current of a charge pump can be self-supplied without being provided by other modules, one branch is cut off by using a capacitor, and the function of the charge pump circuit can be maintained while no static current exists; and therefore,when the phase-locked loop is locked, except that the amplifier has a little power consumption, other parts of the charge pump circuit do not have power consumption or have extremely low power consumption. In order to reduce the leakage power consumption when the switch is closed, the threshold value of the switch tube is changed by changing the substrate voltage, and the substrate of the switchtube is connected to the potential opposite to that of the source electrode when the switch tube is closed, so that the conduction threshold value of the switch tube is increased, and the leakage current is reduced; and in addition, the circuit provided by the invention can realize current self-sufficiency, and the current can be adjusted by adjusting the size of the MOS transistor.

Description

technical field [0001] The invention relates to the technical field of phase-locked loops, in particular to a charge pump circuit with low power consumption and high switching rate. Background technique [0002] The charge pump circuit is a circuit analog interface that connects the internal digital circuit part and the analog circuit part of the digital-analog hybrid phase-locked loop, and converts the phase difference pulse output by the frequency and phase detector into the charging and discharging current of the low-tube filter. It plays an important role in the application of conversion, motor drive and storage circuits. [0003] Some charge pump circuits with high switching rates proposed in the prior art require an external bias current, that is, different branches need to be always on, but the function of the branch is only to provide a certain operating point and the output current of the charge pump, so It will make the circuit a lot of unnecessary power consumpti...

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Problems solved by technology

[0003] Some charge pump circuits with high switching rates proposed in the prior art require an external bias current, that is, different branches need to be always on, but the function of the branch is only to provide a certain operating point and the output current of the charge pump, so It will make the circuit a lot of unnecessary power consumption, especially when the required current is large and the phase-locked loop is not locked, the overall power consumption of the circuit is three times the actual useful power consumption, and when the phase-locked loop is locked He also has a constant branch that consumes current

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