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Title:
FREQUENCY DETECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2020/152764
Kind Code:
A1
Abstract:
Conventional frequency detection circuits have suffered from a problem in which increasing the reception signal frequency to be detected results in an increase in circuit scale.　The frequency detection circuit according to the present invention comprises a first signal source for outputting a first clock signal, a second signal source for outputting a second clock signal having the same frequency as the first clock signal and a different phase, a first sample and hold circuit for undersampling a reception signal using the first clock signal, a second sample and hold circuit for undersampling the reception signal using the second clock signal, and a frequency calculation circuit for calculating the frequency of the reception signal using the phase difference between the output signals of the first sample and hold circuit and second sample and hold circuit.

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Inventors:
WADA OSAMU (JP)
TAJIMA KENICHI (JP)
Application Number:
JP2019/001761
Publication Date:
July 30, 2020
Filing Date:
January 22, 2019
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G01R23/02; G01R13/34; G01R23/16
Domestic Patent References:
WO2018154747A12018-08-30
Foreign References:
JP2009162662A2009-07-23
JP2009300437A2009-12-24
JP2000284008A2000-10-13
JP2006119148A2006-05-11
JP2017216604A2017-12-07
JP2018174415A2018-11-08
US7194365B12007-03-20
Attorney, Agent or Firm:
MURAKAMI, Kanako et al. (JP)
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