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A reusable phase-locked loop low-pass filter

A low-pass filter and phase-locked loop technology, which is applied in the field of reusable phase-locked loop low-pass filters, can solve the problems of increased cost, increased number of off-chip components, and increased system complexity, so as to save costs and solve Difficult to integrate and solve the effect of large area

Active Publication Date: 2013-01-09
上海迦美信芯通讯技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this are that the number of off-chip components increases, the complexity of the system increases, and the cost increases

Method used

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  • A reusable phase-locked loop low-pass filter
  • A reusable phase-locked loop low-pass filter
  • A reusable phase-locked loop low-pass filter

Examples

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Embodiment Construction

[0032] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0033] Such as figure 1 As shown, a kind of reusable phase-locked loop low-pass filter provided by the present invention includes a channel-one circuit 1, a channel-two circuit 2, and a switch circuit 3 connected by circuits; the channel-one circuit 1 and an external channel-charge pump The gating switch 41 of the channel two is connected; the channel two circuit 2 is connected to the gating switch 42 of the channel two charge pump.

[0034] The channel one circuit 1 includes first capacitors C connected in series in sequence 11 , the first selector 11, the first resistor R 11 , the second capacitance C 12 ; The first capacitor C 11 , the second capacitance C 12 ground respectively, the first capacitor C 11 The non-ground terminal of the first selector 11 is connected to the input terminal 1 of the first re...

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Abstract

The invention discloses a reusable phase-locked loop low-pass filter, comprising a channel 1 circuit, a channel 2 circuit and a switching circuit that are in circuit connection; the channel 1 circuit is connected with an outer channel 1 charge pump; and the channel 2 circuit is connected with a channel 2 charge pump. By the reusable phase-locked loop low-pass filter of the invention, the chip space can be saved, thereby solving the problem that the area of the low-pass filter is bigger, not easy for an integration; the cost is saved, and the stability of the loop can be guaranteed.

Description

technical field [0001] The invention relates to a low-pass filter, in particular to a reusable phase-locked loop low-pass filter. Background technique [0002] In the prior art, the frequency synthesizer is often used to provide an accurate reference frequency for the integrated circuit, and the low-pass filter in the frequency synthesizer is used to filter out the high-frequency component of the output voltage of the phase detector, and take a stable average value to control the oscillation the frequency of the device. Generally, in order to obtain better noise suppression, the loop bandwidth of the frequency synthesizer is selected to be relatively small, which leads to relatively large capacitance and resistance of the low-pass filter. If such a large capacitor and resistor are integrated in the chip, it will occupy a huge chip area and greatly increase the cost of the chip. Moreover, due to the process deviation in the production process, the capacitance value and resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/093
Inventor 倪文海张大会徐文华
Owner 上海迦美信芯通讯技术有限公司
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