I-type phase-locked loop with low reference spur and rapid locking

A fast locking, phase-locked loop technology, applied in the direction of electrical components, power automatic control, etc., can solve the problem of not being able to quickly adjust the VCO oscillation frequency, prolong the loop locking time, etc., to optimize the reference spurious performance and speed up the loop The effect of locking speed and reducing interference

Active Publication Date: 2018-03-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit is simple, but when the initial oscillation frequency of the oscillator differs greatly from the frequency of the input reference signal, its output value still cannot quickly adjust the VCO oscillation frequency, resulting in a "locked landslide" effect and prolonging the loop lock time

Method used

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  • I-type phase-locked loop with low reference spur and rapid locking
  • I-type phase-locked loop with low reference spur and rapid locking
  • I-type phase-locked loop with low reference spur and rapid locking

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] image 3 A low-reference spurious fast-locked I-type phase-locked loop circuit provided for the embodiment of the present invention, such as image 3 As shown, it mainly includes: phase detector with saturation, loop filter (LoopFilter), voltage-controlled oscillator (Voltage-Controlled Oscillator), frequency divider (Frequency Divider), sample and hold circuit (Sampling-Hold), Locked Detector (Locked Detector) and switch S1 and switch S2. ...

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Abstract

The present invention discloses an I-type phase-locked loop with low reference spur and rapid locking. The I-type phase-locked loop with low reference spur and rapid locking comprises a phase frequency detector with saturation, a lock detector, a sampling-hold, a voltage-controlled oscillator, a frequency divider circuit, a loop filter and a control switch. The I-type phase-locked loop with low reference spur and rapid locking adds the sampling-hold to allow the circuit of the I-type phase-locked loop to greatly reduce reference spur of output signals to greatly reduce interference of adjacentchannels of a wireless communication transceiver system; and moreover, the I-type phase-locked loop with low reference spur and rapid locking employs the phase frequency detector with saturation andthe lock detector circuit to improve the locking speed of a phase-locked loop circuit and improve the whole performances of the loop of the phase-locked loop.

Description

technical field [0001] The invention relates to the technical field of radio frequency integrated circuits, in particular to a low-reference stray fast-locking I-type phase-locked loop. Background technique [0002] In many applications, such as modulation / demodulation in wireless communication systems, sampling process of high-speed analog-to-digital converter ADC, etc., a reference spurious low signal is required as the local oscillator signal. When the reference spur of the local oscillator signal in the modulation / demodulation process is large, it will generate crosstalk in adjacent channels and reduce the signal-to-noise ratio of the communication system; the reference spur of the sampling clock signal of the high-speed analog-to-digital converter ADC will be converted into a certain Sexual jitter also reduces the signal-to-noise ratio. With the improvement of circuit and communication quality, the demand for low-reference spurious signal generation sources is becoming ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/087H03L7/113
CPCH03L7/087H03L7/113
Inventor 席娜林福江叶甜春
Owner UNIV OF SCI & TECH OF CHINA
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