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Charge pump circuit

A charge pump and circuit technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of phase-locked loop locking time limitation, etc., to achieve the effect of changing the loop bandwidth and speeding up the locking time

Inactive Publication Date: 2015-09-30
南京星霸科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional charge pump circuit usually only has one working current, so that the locking time of the phase-locked loop is limited

Method used

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  • Charge pump circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] see figure 1 , A preferred embodiment of the charge pump circuit of the present application includes a control circuit and a switch circuit.

[0015] The control circuit includes an AND gate AND, an OR gate OR, a first buffer BUF1 connected to the AND gate AND and a second buffer BUF2 connected to the OR gate OR, and the two input terminals UP and DW are respectively connected to The input terminal of the AND gate AND and the OR gate OR, the output terminal of the AND gate AND is grounded through a capacitor C1, and outputs a signal DW_1 to the input terminal of the first buffer BUF1, and the output terminal of the first buffer BUF1 outputs A signal DW_2, and grounded through a capacitor C2; the output end of the OR gate OR is grounded through a capacitor C3, and outputs a signal UP_1 to the input end of the second buffer BUF2, and the output end of the second buffer BUF2 outputs a The signal UP_2 is grounded through a capacitor C4.

[0016] The switch circuit include...

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PUM

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Abstract

A charge pump circuit comprises a switching circuit for supplying charging and discharging current and a control circuit for controlling the switching circuit, wherein the switching circuit comprises a first switch for controlling the charging speed, and the control circuit generates a signal for controlling the first switch according to pulse width of an input signal. The circuit accelerates the locking of a phase-locked loop.

Description

technical field [0001] The present application relates to a control circuit, especially a charge pump circuit capable of automatically adjusting the charging and discharging current according to the pulse width of the signal. Background technique [0002] Whether it is a phase-locked loop or a delay phase-locked loop, the phase difference between its own output signal and the input signal needs to be identified by a phase frequency detector, and then the phase difference is integrated by a charge pump, and the integrated The result is reflected in the control voltage in the form of voltage variation, and then the control voltage is used to control the voltage-controlled oscillator or the voltage-controlled delay line until the phase between the two is synchronized. The traditional charge pump circuit usually has only one working current, so that the locking time of the phase-locked loop is limited. Contents of the invention [0003] In view of the above, it is necessary t...

Claims

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Application Information

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IPC IPC(8): H02M3/07
Inventor 何利伟
Owner 南京星霸科技有限公司