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Clock correction method and Bluetooth chip

A Bluetooth chip and clock correction technology, applied in digital transmission systems, electrical components, synchronization devices, etc., can solve the problems of clock frequency accuracy and cost overhead, and achieve the effect of less cost resources and lower chip costs

Active Publication Date: 2018-07-27
APPOTECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the embodiment of the present invention is to provide a clock correction generation method and a Bluetooth chip, which can solve the problem of contradiction between the frequency accuracy and cost of the existing clock

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  • Clock correction method and Bluetooth chip
  • Clock correction method and Bluetooth chip
  • Clock correction method and Bluetooth chip

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0043] In chips or electronic products, it is always expected that the oscillator can maintain a stable frequency under different working environments, and provide or output a reference clock signal with a small periodic error. Based on the reference clock signal, the internal clock source of the chip can generate multiple clocks with different frequencies by means of frequency multiplication or frequency division, and provide them to the corresponding functional modules to realize functions such as synchronization, communication or timing.

[0044] However, due to the process difference in the pro...

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Abstract

The embodiment of the invention provides a clock correction method and a Bluetooth chip. The Bluetooth chip comprises a phase-locked loop used for generating a working clock of the Bluetooth chip according to a reference clock; an oscillator used for providing the reference clock to the fractional phase-locked loop; a radio frequency antenna used for receiving a radio frequency signal; a signal processing circuit used for demodulating the radio frequency signal to obtain an access code of a Bluetooth data packet; a deviation calculation circuit used for calculating a clock frequency deviationaccording to the access code; and a correcting circuit used for adjusting the frequency dividing ratio of the phase-locked loop according to the clock frequency deviation.

Description

technical field [0001] The invention relates to the technical field of clock circuits, in particular to a clock correction generation method and a bluetooth chip. Background technique [0002] In existing chip products, the clock circuit for providing clock signals is a very important part of the chip, and is one of the basic circuits for realizing various chip functions. [0003] The clock signal of most chip products is derived from the built-in RC or LC oscillator circuit on the chip. However, the frequency accuracy of the clock signal provided by this type of oscillating circuit is low, and it is easily affected by operating temperature, process deviation, etc., and frequency deviation occurs. Clock signals based on these oscillating circuits will also have a corresponding impact, making it difficult for the chip to meet the frequency accuracy requirements for the clock signal. [0004] In order to correct the frequency offset of the oscillating circuit, various clock ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04W56/00
CPCH04L27/0014H04L2027/0026H04W56/0035
Inventor 傅景权余振邦
Owner APPOTECH
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