Unlock instant, AI-driven research and patent intelligence for your innovation.

Automatic frequency control method and system, electronic equipment and medium

A technology of automatic frequency control and control word, which is applied in the direction of automatic power control and electrical components, and can solve the problem of narrow adjustable frequency deviation range

Pending Publication Date: 2020-07-31
SPREADTRUM COMM (SHANGHAI) CO LTD
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an automatic frequency control method, system, electronic equipment and medium in order to overcome the defect that the adjustable frequency deviation range of the frequency control scheme in the prior art is relatively narrow

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Automatic frequency control method and system, electronic equipment and medium
  • Automatic frequency control method and system, electronic equipment and medium
  • Automatic frequency control method and system, electronic equipment and medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment provides an automatic frequency control method, referring to figure 1 , the automatic frequency control method includes the following steps:

[0058] Step S101, acquiring the output frequency offset of the crystal.

[0059] Step S102, adjusting the CAFC control word according to the output frequency offset.

[0060] Step S103, adjusting the CDAC control word according to the CAFC control word.

[0061] During specific implementation, the automatic frequency control method is applied to a frequency control module, including a crystal, a control unit, and an adjustable capacitor. The control unit generates a control word of the adjustable capacitor according to the automatic frequency control method of this embodiment, so as to adjust the adjustable capacitor to realize frequency control.

[0062] As an optional implementation manner, in step S101, the control unit acquires an output frequency offset of the crystal. In step S102, the control unit adjus...

Embodiment 2

[0064] On the basis of Embodiment 1, this embodiment provides an automatic frequency control method. In this embodiment, the first preset interval takes the first threshold as the lower limit of the interval, and takes the second threshold as the upper limit of the interval.

[0065] After the CDAC control word is adjusted accordingly in step S102, in step S103, if the CAFC control word is less than the first threshold, then the CDAC control word is reduced by a preset step size, and the CAFC control word is increased by a preset coefficient; If the CAFC control word is greater than the second threshold, increase the CDAC control word by a preset step size, and decrease the CAFC control word by a preset coefficient; if the CAFC control word belongs to the first preset interval, the adjustment ends.

[0066] As an optional implementation manner, the value of the preset step size is 1.

[0067] As an optional implementation, the preset coefficient factor=(FER_CDAC_a-FER_CDAC_b)...

Embodiment 3

[0075] This embodiment provides an automatic frequency control method. The automatic frequency control method in this embodiment is substantially the same as the automatic frequency control method in Embodiment 2, except that the settings of the preset coefficients are different.

[0076] In this embodiment, the first preset interval is divided into n subintervals, and the second preset interval is divided into m subintervals, then when the CDAC control word is in the ith subinterval and the CAFC control word is in the jth subinterval, the corresponding The preset coefficient factor[i,j]=(FER_CDAC_a i,j -FER_CDAC_a (i+1),j )*(CAFC_a j -CAFC_a j+1 ) / ((CDAC_a i -CDAC_a i+1 )*(FER_CAFC_a i,j -FER_CAFC_a i,(j+1) )), i∈[1,n], j∈[1,m]. Among them, CAFC_a j and CAFC_a j+1are the two endpoints of the jth subinterval of the second preset interval respectively, CDAC_a i and CDAC_a i+1 are respectively the two endpoints of the i-th subinterval of the first preset interval, i∈...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an automatic frequency control method and a system, electronic equipment and a medium, and the method comprises the following steps: obtaining the output frequency offset of acrystal; adjusting a CAFC control word according to the output frequency offset; and adjusting the CDAC control word according to the CAFC control word. According to the invention, through dynamic CDAC, the adjustable frequency range is increased.

Description

technical field [0001] The invention belongs to the technical field of frequency control, and in particular relates to an automatic frequency control method, system, electronic equipment and media. Background technique [0002] At present, the frequency control module of NB-IoT (Narrowband Internet of Things) chips often includes crystals, control units, and adjustable capacitors. The control unit generates the control word of the adjustable capacitor according to the deviation of the crystal frequency, so as to adjust the adjustable capacitor. When performing frequency calibration, the control word of CAFC (fine tuning capacitor) is fixed, and the output frequency deviation is within + / -1ppm (one millionth) by adjusting CDAC (coarse tuning capacitor). After the calibration is completed, the control word of CDAC is fixed at the calibration value and remains unchanged. During the working process of the NB-IoT chip, the control unit adjusts the control word of the CAFC accor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H03L7/16
CPCH03L7/16
Inventor 郑咏秋王致远陶峰刘入忠
Owner SPREADTRUM COMM (SHANGHAI) CO LTD