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Title:
FREQUENCY SELECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2022/126894
Kind Code:
A1
Abstract:
Provided is a frequency selection circuit. The frequency selection circuit comprises a voltage-controlled oscillator, a feedback frequency divider, a frequency selection unit and a register set, wherein the voltage-controlled oscillator is used for outputting a frequency corresponding to a frequency adjustment window; the frequency divider is used for performing frequency division on a clock frequency output by the voltage-controlled oscillator and feeding back, to the frequency selection unit, low frequencies obtained after frequency division; the frequency selection unit is used for comparing a reference frequency with the low frequencies output by the frequency divider, and for configuring the frequency adjustment window according to a frequency search window and providing the frequency adjustment window for the voltage-controlled oscillator; and the register set is used for outputting the frequency search window and providing same for the frequency selection unit. By means of the frequency selection circuit of the present application, a clock frequency is output and passes through the feedback frequency divider; the clock frequency is divided so as to obtain low frequencies from a high frequency, and the low frequencies are output; and the low frequencies are compared with a reference frequency, such that the low frequency which is the same as the reference frequency is found.

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Inventors:
ZHUO CHUNTAN (CN)
LIANG YUANJUN (CN)
Application Number:
PCT/CN2021/082550
Publication Date:
June 23, 2022
Filing Date:
March 24, 2021
Export Citation:
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Assignee:
SHENZHEN PANGO MICROSYSTEMS CO LTD (CN)
International Classes:
H03L7/099
Foreign References:
CN102868399A2013-01-09
CN108155906A2018-06-12
CN107947791A2018-04-20
CN104092459A2014-10-08
US20090115537A12009-05-07
Attorney, Agent or Firm:
SHENZHEN CHINA INNOVATION SOUTH INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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