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Phase frequency discriminator

A phase-frequency discriminator technology, which is applied to frequency measurement devices, mutually independent oscillating circuits, electrical components, etc., can solve problems such as phase-frequency discriminator errors, and achieve reduced chip area, simplified structure, and a small number of tubes Effect

Inactive Publication Date: 2008-01-09
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the generation of the delay will likely make the phase-frequency discriminator erroneous

Method used

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specific Embodiment approach 1

[0041] As shown in Figure 2, a phase frequency discriminator includes a first edge trigger module 3, a second edge trigger module 4, a first preset module 5, a second preset module 6, a first output node 1, a second output Node 2 and output signal comparison module 7 . The output terminal of the first preset module 5 is electrically connected to the first output node 1, and is used to preset the first output node 1 after receiving the reset signal rst; the output terminal of the second preset module 6 is connected to the second output node 2 is electrically connected to preset the second output node 2 after receiving the reset signal rst. The input terminal of the first edge trigger module 3 is connected to the first input signal a, and the output terminal is electrically connected to the first output node 1, for falling after the first output node 1 is preset and the input first input signal a The first output signal out1 is generated at edge time; the input terminal of the ...

specific Embodiment approach 2

[0053] As shown in Figure 2, a phase frequency discriminator includes a first edge trigger module 3, a second edge trigger module 4, a first preset module 5, a second preset module 6, a first output node 1, a second output Node 2 and output signal comparison module 7 . The output terminal of the first preset module 5 is electrically connected to the first output node 1, and is used to preset the first output node 1 after receiving the reset signal rst; the output terminal of the second preset module 6 is connected to the second output node 2 is electrically connected to preset the second output node 2 after receiving the reset signal rst. The input terminal of the first edge trigger module 3 is connected to the first input signal a, and the output terminal is electrically connected to the first output node 1, for rising after the first output node 1 is preset and the input first input signal a The first output signal out1 is generated at edge time; the input terminal of the s...

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Abstract

The invention discloses a phase frequency identifier, its first and second preset modules comprise a PMOS tube and an NMOS tube each, sources of the two PMOS tubes are connected with high logic level, sources of the two NMOS tubes are connected with low level, grids of the two PMOS or NMOS tubes are connected with reset signal, drains of the two MOS tubes connected with reset signal are connected with grids of the other two MOS tubes, drains of the two MOS tubes unconnected with reset signal are connected with first and second output nodes, respectively. And it can preset output nodes without delay of multiple transmission gates. And it completes preset bit while reset and raises working rate.

Description

technical field [0001] The invention relates to a circuit for comparing the phase frequencies of two mutually independent oscillation signals, in particular to a phase frequency discriminator. Background technique [0002] Generally speaking, a Phase Frequency Discriminator (PFD for short) can provide an output signal according to the phase or frequency relationship between two input signals. For example, in a phase-locked circuit, the phase-frequency discriminator can be used to compare a reference signal (Vref) with a signal output from a voltage-controlled oscillator (VCO) to detect the difference between the two signals. The phase difference or frequency difference is used to provide an output signal related to the phase difference or the frequency difference, and the frequency of the voltage-controlled oscillator can be changed according to the output signal. In this way, the signal output from the voltage-controlled oscillator can gradually be in phase or at the same ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02H03D13/00
Inventor 王龙李崇仁
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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