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Circuit and method for reducing phase noise of charge pump phase-locked loop

A phase noise, charge pump technology, applied in the direction of electrical components, automatic power control, etc., to achieve the effect of reducing output phase noise

Pending Publication Date: 2020-06-16
深圳芯行科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of technology, the traditional phase-locked loop technology can no longer meet the needs of today's society, so the application technology of the charge pump phase-locked loop has emerged

Method used

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  • Circuit and method for reducing phase noise of charge pump phase-locked loop
  • Circuit and method for reducing phase noise of charge pump phase-locked loop
  • Circuit and method for reducing phase noise of charge pump phase-locked loop

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Embodiment Construction

[0039] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. The following embodiments are used to illustrate the present invention, but not to limit the scope of the present invention.

[0040] refer to figure 2 As shown, the embodiment of the present invention provides a circuit for reducing phase noise of a charge pump phase-locked loop, including a charge pump, and the charge pump includes a bias circuit, a charging circuit, a discharging circuit, a charging switch, a discharging switch and a noise reduction circuit , the noise reduction circuit is respectively connected with the bias circuit, the charging circuit and the discharge circuit, and the noise reduction circuit is used to filter out the noise generated by the bias circuit.

[0041] Specifically, the relevant structure of the charge...

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Abstract

The invention discloses a circuit and a method for reducing phase noise of a charge pump phase-locked loop. The circuit comprises a charge pump, the charge pump comprises a bias circuit, a charging circuit, a discharging circuit, a charging switch, a discharging switch and a noise reduction circuit, the noise reduction circuit is connected with the bias circuit, the charging circuit and the discharging circuit, and the noise reduction circuit is used for filtering noise generated by the bias circuit; and the circuit and the method have the advantages that when the charging circuit and the discharging circuit work, a connecting line between the biasing circuit and the charging or discharging circuit is cut off through the arranged noise reduction circuit, noise generated by the biasing circuit cannot be transmitted, the noise generated by the biasing circuit is filtered out, and therefore the purpose of reducing output phase noise of the phase-locked loop is achieved.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a circuit and a method for reducing the phase noise of a phase-locked loop of a charge pump. Background technique [0002] With the continuous development of technology, the traditional phase-locked loop technology can no longer meet the needs of today's society, so the application technology of the charge pump phase-locked loop has emerged. [0003] However, in the prior art, the charge pump in the charge pump phase-locked loop has a specific structure such as figure 1 As shown, the output signal of the frequency and phase detector is converted into charging and discharging current signals. The charge and discharge currents are sourced from the bias circuit, and the noise from the bias circuit passes through the loop filter and the voltage-controlled oscillator to form part of the phase noise of the phase-locked loop's output. Contents of the invention [0004] The ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099H03L7/085
CPCH03L7/099H03L7/085
Inventor 万晓船
Owner 深圳芯行科技有限公司