Charge pump circuit for suppressing current mismatch, control method thereof, and phase-locked loop circuit

Abstract

A charge pump circuit for suppressing current mismatch, its control method, and a phase-locked loop circuit, relating to the technical field of communications, comprising: a first control circuit (10), a second control circuit (20) and a first feedback circuit (30) ; The first control circuit is used to input the first current from the first current input node (D1) to the second feedback node (E2); the first feedback circuit is used to connect the first feedback node (E1) and the filter node (Vx) Under the control of the control, the value of the current input to the second feedback node is equal to the value of the first current; the second control circuit is used to ensure that the potential of the third control signal from the third control node (K3) is an effective potential, and from When the potential of the fourth control signal of the fourth control node (K4) is an effective potential, the second current from the second current input node (D2) is input to the output node (Vout), and the value of the first current is equal to The current input to the second feedback node. The charge pump circuit can suppress the current mismatch between the charging current and the discharging current, thereby ensuring the stability of the output voltage of the charge pump.

Description

Technical field [0001] The present application relates to the field of communication technology, and Background technique [0002] Packed loop generally includes the phase / frequency detector, PFD, charge pump (CHARGEPUMP, CP), loop filter (LOOP Filter, LPF), voltage controlled oscillator (VCO) and division Divider. Among them, the charge pump is an important part of the phase-locked loop, which can convert the signal output by the phase identifier to a voltage signal through the loop filter, and control the oscillation frequency of the voltage controlled oscillator by the voltage signal. [0003] In the relevant technique, the charge pump circuit generally includes two sizes of current IUP and current IDn generated by the same bias current mirroring circuit, coupled between the input nodes of the current IUP and the input nodes of the current IDN. The road, and a feedback loop crossing between the two circuit branches, the feedback circuit is used to ensure the stability of the...

AI Technical Summary

Problems solved by technology

[0004] However, in actual implementation, due to factors such as process, voltage and temperature deviation, the current Iup and the current Idn may not be equal, resulting in a current mismatch between the two, which affects the stability of the charge pump output voltage.

Images