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Rapid automatic frequency calibration device and method

An automatic frequency calibration and fast technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of reducing calibration time, long calibration time, unable to meet the application requirements of high-performance rapid calibration system, etc. Time reduction, the effect of meeting application requirements

Pending Publication Date: 2021-12-17
连云港坤芯微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the technical problem that the automatic frequency calibration scheme in the prior art has a long calibration time (tens to hundreds of microseconds) and cannot meet the application requirements of a high-performance fast calibration system, and provides a new technology to improve the frequency calibration speed, Reduce Calibration Time

Method used

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  • Rapid automatic frequency calibration device and method
  • Rapid automatic frequency calibration device and method
  • Rapid automatic frequency calibration device and method

Examples

Experimental program
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Embodiment 1

[0061] Please refer to Figure 2A , a fast automatic frequency calibration device 2 provided in the embodiment of the present application, including:

[0062] The global clock generating circuit 21 includes: a first input terminal and a second input terminal; the first input terminal is connected to a voltage-controlled oscillator VCO for inputting a VCO frequency signal Fvco; the second input terminal is connected to a reference signal source REF_SIG_S connection for input reference frequency signal F REF ; By controlling the VCO frequency signal Fvco to the reference frequency signal F REF Sampling is performed to obtain a global clock signal CKR; wherein, the global clock signal CKR is used to synchronize the counters in the integer period calculation unit 22 and the fractional period calculation unit 24 .

[0063] The integer cycle calculation unit 22 includes: a third input terminal and a fourth input terminal; the third input terminal is connected to the voltage-contro...

Embodiment 2

[0099] Based on the same inventive concept, an embodiment of the present invention also provides a fast automatic frequency calibration method, including the following steps:

[0100] By controlling the VCO frequency signal Fvco to the reference frequency signal F REF Oversampling to obtain the global clock signal CKR;

[0101] Obtain a reference frequency signal F by processing the VCO frequency signal Fvco and the global clock signal CKR REF The number of integer periods of the VCO frequency signal Fvco within the period;

[0102] By performing multiple inversion delay processing on the VCO frequency signal Fvco, an inversion delay signal is obtained, and the reference frequency signal F REF Sampling the inverted delayed signal to obtain a sampled signal;

[0103] Calculate the reference frequency signal F based on the sampled signal REF The difference between the rising edge of the adjacent VCO frequency signal Fvco, and determine the reference frequency signal F based ...

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Abstract

The invention discloses a rapid automatic frequency calibration device and method, and the method comprises the steps: carrying out the counting of the number of integer cycles and the number of decimal cycles of a VCO frequency signal in a reference frequency signal cycle through employing an integer cycle calculation unit and a decimal cycle calculation unit, carrying out multiple times of inverse delay processing on a VCO frequency signal through an inverse delay sampling circuit, and sampling an inverse delay signal through a reference frequency signal; calculating the difference value between the reference frequency signal and the rising edge of the adjacent VCO frequency signal behind the reference frequency signal based on the sampled signal, and determining the number of decimal cycles of the VCO frequency signal in the reference frequency signal cycle based on the difference value; adding the number of the integer cycles and the number of the decimal cycles, so the number of the complete cycles of the VCO frequency signal in the reference frequency signal cycle can be quickly and accurately obtained, and a control logic word is further generated to control and calibrate the output frequency of a voltage-controlled oscillator. The calibration time is effectively shortened, and the application requirement of a high-performance rapid frequency calibration system can be met.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a fast automatic frequency calibration device and method. Background technique [0002] Frequency Synthesizer (FS, Frequency Synthesizer) is a very important module in modern wireless transceivers, such as Figure 1A Shown is a schematic diagram of the basic structure of the FS, including a phase-locked loop (PLL, Phase Locked Loop) structure 1, a capacitor array 2 and a frequency calibration module 3, and the PLL structure 1 is mainly composed of a phase frequency detector PFD (Phase Frequency Detector) 11, The charge pump CP (Charge Pump) 12, the loop filter LPF (Low Pass Filter) 13, the frequency divider (Divider) 14 and the voltage controlled oscillator VCO (Voltage Controlled Oscillator) 15 are composed. [0003] In order to ensure strong robustness when the power voltage temperature (PVT, Power Voltage Temperature) changes, the FS is usually required to output a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099H03L7/14H03L7/087
CPCH03L7/0992H03L7/148H03L7/087H03L7/0994
Inventor 胡昂
Owner 连云港坤芯微电子科技有限公司