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CHARGE PUMP and Phase-locked loop

A charge pump and electrode technology, applied in electrical components, conversion equipment without intermediate conversion to AC, automatic power control, etc., can solve problems such as charge pump function and noise deterioration, narrow control voltage range, etc.

Active Publication Date: 2019-07-12
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a larger drain-source voltage means that the control voltage for the subsequent VCO has a narrower range
This narrow headroom problem can be made worse if the charge pump is used in low voltage applications (i.e. low supply voltage) and the charge pump functionality and noise can be degraded

Method used

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  • CHARGE PUMP and Phase-locked loop
  • CHARGE PUMP and Phase-locked loop
  • CHARGE PUMP and Phase-locked loop

Examples

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Embodiment Construction

[0021] Certain terms are used throughout the following description and claims to refer to particular system components. As will be understood by those skilled in the art, manufacturers may refer to components by different names. This document does not intend to distinguish between components that have different names but have the same function. In the following discussion and claims, the terms "comprises" and "comprises" are used in an open-ended fashion and therefore should be construed to mean "including but not limited to...". The term "coupled" is intended to mean an indirect or direct electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

[0022] figure 1 is a schematic diagram illustrating a charge pump 100 according to one embodiment of the present invention. like figure 1 As shown, the charge pump 100 i...

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PUM

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Abstract

The present invention provides a phase-locked loop and a charge pump including a pull-up circuit for selectively providing charges to an output terminal of the charge pump, and the pull-up circuit comprises a first transistor, a first capacitor and a switched-capacitor circuit, wherein the first capacitor is coupled to an electrode of the first transistor, and the switched-capacitor circuit is coupled between a supply voltage and another electrode of the first transistor. The switched-capacitor circuit is configured to boost a voltage of the other electrode of the first transistor to charge the first capacitor via the first transistor, and then the first capacitor and the output terminal of the charge pump are under a charge distribution operation. Through use of the technical solution ofthe present invention, the voltage of the output terminal of the charge pump can have a large range.

Description

technical field [0001] The present invention relates generally to charge pumps, and more particularly to charge pumps and phase locked loops with level shifting mechanisms. Background technique [0002] A conventional charge pump usually includes two current sources for charging and discharging an output node to generate an appropriate control voltage for a subsequent voltage-controlled oscillator (VCO) to generate an output clock signal. The two current sources are generally realized by P-type transistors and N-type transistors respectively, and the drain-to-source voltage of the P-type transistors or N-type transistors is usually designed to be larger to have lower noise. However, a larger drain-source voltage means that the control voltage for the subsequent VCO has a narrower range. This narrow headroom problem may become worse if the charge pump is used in low voltage applications (ie low supply voltage), and the function and noise of the charge pump may be degraded. ...

Claims

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Application Information

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IPC IPC(8): H02M3/07H03L7/085
CPCH02M3/07H03L7/085H03L7/0895H03L7/099H03L7/0896
Inventor 薛育理沈致贤洪兆庆黄柏钧
Owner MEDIATEK INC
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