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Method and device for measuring the frequency of a signal

A technology of the signal and frequency to be measured, which is applied in the direction of frequency measurement device, conversion of frequency to pulse sequence, and independent oscillating circuits, etc., to achieve fast and simple determination

Active Publication Date: 2019-08-30
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This results in a substantial duration of the gain calibration phase

Method used

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  • Method and device for measuring the frequency of a signal
  • Method and device for measuring the frequency of a signal
  • Method and device for measuring the frequency of a signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0064] figure 1The figure shows an example of a method for determining the frequency of the periodic signal SIG from the periodic reference signal REF.

[0065] The reference signal REF may be, for example but not limited to, a reference signal of a phase locked loop and the signal SIG may be, for example but not limited to, a signal delivered by a voltage controlled oscillator forming part of the same phase locked loop.

[0066] In the rest of the description, the index i will be used to represent the period P with the reference signal i related elements. Therefore, index 1 and period P 1 Associated, index 2 with period P 2 associated, and so on.

[0067] In the first step a) of the method, during the first reference period P of the reference signal REF 1 The number of overall cycles performed on the first signal SIG during the C i of counts.

[0068] During the first number S of reference periods P i period, for each other consecutive period P of the reference signa...

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Abstract

A method includes a) counting whole periods of a signal during a first period of a reference signal, b) repeating step a) for each period of the reference signal until a first duration is equal to a first quantity of periods of the reference signal, and c) determining a first average of the whole periods. The method also includes repeating at least one of steps a) to c) and at each repetition shifting a start of the counting of step a) by at least one period of the reference signal, and in steps b) and c) accounting for whole periods of the signal already counted during the at least one preceding group of steps a) and b). The method includes determining a second average of the first averages, and determining the frequency of the signal from the second average and the frequency of the reference signal.

Description

technical field [0001] Embodiments and examples of the present invention relate to periodic signal frequency measurements. Background technique [0002] The present invention applies, for example but without limitation, to calibrating the gain of a voltage controlled oscillator (VCO) in a phase locked loop (PLL). [0003] A phase locked loop is a loop system capable of delivering a signal whose frequency is dependent on that of a reference signal. [0004] More precisely and traditionally speaking, a phase locked loop notably includes: a phase comparator receiving a reference signal on one input; and, a voltage controlled oscillator, the control input of which is coupled to the output of the phase comparator and The output of the post-frequency loop back onto the other input of the phase comparator delivers an output signal that is subordinate in frequency and phase to that of the reference signal but generally has a higher frequency than that of the reference signal. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/10
CPCG01R23/10G01R23/02H03D13/001
Inventor M·乌德比纳S·德迪厄
Owner STMICROELECTRONICS SRL