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Charge pump and associated phase-locked loop and clock and data recovery device

A clock data recovery, charge pump technology, applied in electrical components, conversion equipment without intermediate conversion to AC, automatic power control, etc., can solve the problems of increasing chip area and manufacturing cost, and achieve the effect of reducing chip area.

Inactive Publication Date: 2017-07-21
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two charge pumps increase die area and manufacturing cost

Method used

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  • Charge pump and associated phase-locked loop and clock and data recovery device
  • Charge pump and associated phase-locked loop and clock and data recovery device
  • Charge pump and associated phase-locked loop and clock and data recovery device

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Embodiment Construction

[0026] The following description is a preferred embodiment of the present invention, which is only used to illustrate the technical features of the present invention, but not to limit the scope of the present invention. While certain terms are used throughout the specification and claims to refer to specific elements, those skilled in the art should understand that manufacturers may use different names for the same element. Therefore, the specification and claims do not use the difference in name as the way to distinguish components, but use the difference in function of the components as the basis for the difference. The terms "element", "system" and "apparatus" used in the present invention may be a computer-related entity, where the computer may be hardware, software, or a combination of hardware and software. The terms "comprising" and "including" mentioned in the following description and claims are open terms, so they should be interpreted as "including, but not limited ...

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Abstract

A charge pump includes a current source circuit, a current sink circuit and a switch circuit. The switch circuit is coupled between the current source circuit and the current sink circuit, and is arranged for generating a first current at a first output terminal and generating a second current at a second output terminal according to a first control signal and a second control signal, wherein each of the first current and the second current is generated from the current source circuit and the current sink circuit. Correspondingly, the invention also provides a phase-locked loop and a clock and data recovery device. With the invention, the chip area can be reduced.

Description

technical field [0001] The present invention relates to a charge pump (charge pump, CP) circuit, and more particularly, to a circuit applicable to a phase-locked loop (phase-locked loop, PLL) or a clock data recovery (clock and data recovery, CDR) device charge pump. Background technique [0002] Some phase locked loops (PLLs) are designed with active filters that have a capacitance multiplier effect. However, such a design requires two charge pumps to provide two different currents to the active filter. These two charge pumps increase chip area and manufacturing cost. Contents of the invention [0003] In view of this, one object of the present invention is to provide a charge pump, a phase-locked loop and a clock data recovery device to solve the above problems. [0004] In a first aspect, the present invention provides a charge pump, which includes a source current source circuit, a current sink source circuit and a switch circuit. The switch circuit is coupled betw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/089H03L7/18
CPCH03L7/0891H03L7/18H03L7/0896H03L7/093H02M3/07H03L7/0807H03L7/0895H03L7/099
Inventor 王腾毅
Owner MEDIATEK INC