Charge pump circuit for low current mismatching and low current change

A technology of current circuit and charge pump, which is applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of ignoring current dynamic mismatch and current change, and achieve the effect of reducing nonlinearity

Inactive Publication Date: 2011-09-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of the above technologies effectively reduces the mismatch of the charging and discharging currents caused by the change of the output volt

Method used

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  • Charge pump circuit for low current mismatching and low current change
  • Charge pump circuit for low current mismatching and low current change
  • Charge pump circuit for low current mismatching and low current change

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] figure 1 The circuit diagram of the novel charge pump with low current mismatch and current variation provided for the present invention. The structure consists of two operational amplifiers A V1 and A V2 , Generate and output voltage V out Proportional to the charge pump current branch, generating and output voltage V out inversely proportional to the charge pump current branch. V out proportional to the charge pump current branch with the V out The inversely proportional charge pump current branch is connected through the output, and the total charging current at the output is given by I up1 + I up2 Composed of, the total discharge current consists of I dn1 + I dn2 composition.

[0021] figure 2 The novel charge pump provided by the present invention has a charge pump reference current bias circuit with a positive output voltage...

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Abstract

The invention belongs to the technical field of clocks and in particular discloses a charge pump circuit structure which is based on a standard complementary metal oxide semiconductor (CMOS) process, has low current mismatching and low current change and is applicable to a charge pump type phase locked loop. The charge pump circuit consists of a current biasing circuit, a reference current circuit, an output current circuit and an amplifier. A negative feedback loop is formed by utilizing the amplifier so as to reduce mismatching of charging current and discharging current due to the voltage change at an output end; and when the voltage at the output end changes, the total change of the charging current and the discharging current is reduced by adding current with a positive output voltage coefficient and current with a negative output voltage coefficient. The charge pump circuit can effectively reduce the mismatching of the charging current and the discharging current and the current change. Meanwhile, the circuit has high speed, low power consumption and low noise.

Description

technical field [0001] The invention belongs to the technical field of clocks, and in particular relates to a charge pump circuit suitable for a charge pump phase-locked loop circuit based on a standard CMOS process. Background technique [0002] Clock is one of the most widely used modules, and its performance will directly affect the final performance index of the system. High-performance charge-pump clock circuits have always been a research hotspot in integrated circuits. The current mismatch of the charge pump circuit directly affects the phase noise of the clock circuit and the magnitude of spurs. In the case where the phase-locked loop is not locked, its main function is to convert the phase difference in the system into a current output, and then through the low The pass filter generates the output voltage to adjust the output frequency of the voltage-controlled oscillator; in the case of phase-locked loop locking, its main function is to stabilize the voltage-contro...

Claims

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Application Information

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IPC IPC(8): H02M3/07
Inventor 梅年松黄煜梅付健
Owner FUDAN UNIV
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