Loop filtering method, loop filter and phase-locked loop

A loop filter and loop filter technology, applied in the direction of electrical components, automatic power control, etc., can solve problems such as increased power consumption overhead and phase-locked loop circuit complexity.

Active Publication Date: 2018-05-25
LOONGSON TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The main purpose of the present invention is to provide a loop filtering method, a loop filter, and a phase-locked loop to solve the problem of suppressing the stray noise of the phase-locked loop in the prior art and easily causing the circuit complexity and power consumption of the phase-locked loop raised questions

Method used

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  • Loop filtering method, loop filter and phase-locked loop
  • Loop filtering method, loop filter and phase-locked loop
  • Loop filtering method, loop filter and phase-locked loop

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Embodiment 1

[0043] According to the embodiments of the present invention, a method embodiment that can be used to implement the device embodiments of the present application can be provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be implemented in a group of computer-executable instructions. It is executed in a computer system, and although a logical sequence is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than here.

[0044] According to an embodiment of the present invention, a filtering method is provided. The following specifically introduces the phase-locked loop control method provided by the embodiment of the present invention:

[0045] Figure 4 Is a flowchart of a filtering method according to an embodiment of the present invention, such as Figure 4 As shown, the filtering method mainly includes the following steps S401 to S405:

[0046] S401: Provide an energy storage group, ...

Embodiment 2

[0058] The embodiment of the present invention also provides a loop filter, which is mainly used to implement any of the loop filtering methods provided in the above-mentioned content of the embodiment of the present invention. The following describes the loop filter provided in the embodiment of the present invention. The filter is specifically introduced:

[0059] Figure 5 Is a schematic diagram of a loop filter according to an embodiment of the present invention, such as Figure 5 As shown, the loop filter provided by the embodiment of the present invention mainly includes an energy storage group, a first switch array, a second switch array, and a second energy storage device, where:

[0060] The energy storage group includes m first energy storage devices, Figure 5 The four first energy storage devices are schematically shown in C11, C12, C13, and C14 in sequence. The first end of each first energy storage device is used to receive charge, and the second end is used for ground...

Embodiment 3

[0095] According to the embodiment of the present invention, a phase-locked loop is also provided. The following specifically introduces the phase-locked loop provided by the embodiment of the present invention:

[0096] Figure 7 Is a structural diagram of a phase-locked loop according to an embodiment of the present invention, such as Figure 7 As shown, the phase-locked loop of this embodiment mainly includes: Voltage Controlled Oscillator (VCO), Charge Pumping (CP) and Loop Filter (LPF), in which:

[0097] The charge pump is used to sequentially provide charge to the m first energy storage devices in the loop filter, that is, to cyclically generate a voltage signal on the loop filter, where the charge pump filters in the loop in each cycle. M voltage signals are sequentially generated on the device, m≥4, and m is an integer.

[0098] Specifically, the charge pump mainly outputs electric charge to the energy storage device of the loop filter. The energy storage device accumulates ...

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PUM

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Abstract

The invention discloses a loop filtering method, a loop filter and a phase-locked loop, which solves the problem in the prior art that suppressing the stray noise of the phase-locked loop is likely to cause the circuit complexity and power consumption of the phase-locked loop to increase question. The method includes: providing an energy storage group, the energy storage group including m first energy storage devices, wherein m is greater than or equal to 4, and m is an integer; sequentially performing m first energy storage devices within one filtering period The charging is completed, and the filter period is the time interval between two adjacent charges of a first energy storage device; from the current charging of the first energy storage device to the start of charging again, the first energy storage device that is currently charged and the first energy storage device that is currently charged are controlled. Charge sharing is performed among other first energy storage devices in the energy storage group except the currently charged first energy storage device to generate a filter voltage.

Description

Technical field [0001] The invention relates to the field of circuit design, in particular to a loop filter method, a loop filter and a phase-locked loop. Background technique [0002] The development of modern science and technology has put forward higher and higher requirements for signal sources, requiring signal sources to have frequency bandwidth, high frequency resolution, high frequency stability, low phase noise and spurs, and programmable control. Frequency synthesis technology is the main technology to generate a large number of high-precision frequency signals. Phase Locked Loop (PLL) is a circuit that performs frequency synthesis and outputs a relatively stable frequency. At present, phase-locked loops are implemented through phase locking. Circuits with stable power output have been widely used in communications, radars, instrumentation, high-speed computers and navigation equipment. The phase locked loop is generally composed of a phase detector, a charge pump, a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/093H03L7/099
Inventor 杨丽琼王岳
Owner LOONGSON TECH CORP
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