JPS54121610A - Pll circuit of radio receiver - Google Patents

Pll circuit of radio receiver

Info

Publication number
JPS54121610A
JPS54121610A JP2869378A JP2869378A JPS54121610A JP S54121610 A JPS54121610 A JP S54121610A JP 2869378 A JP2869378 A JP 2869378A JP 2869378 A JP2869378 A JP 2869378A JP S54121610 A JPS54121610 A JP S54121610A
Authority
JP
Japan
Prior art keywords
divider
frequency
pll circuit
circuit
division ratio
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2869378A
Other languages
Japanese (ja)
Inventor
Shigeki Inoue
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2869378A priority Critical patent/JPS54121610A/en
Publication of JPS54121610A publication Critical patent/JPS54121610A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits
    • H04B1/26Circuits for superheterodyne receivers

Abstract

PURPOSE:To secure the optimum and accurate reception regardless of dispersion of the central frequency of the intermediate frequency filter for the PLL circuit of the digital synthesizer receiver by varying the division ratio of the divider which divides the crystal oscillation frequency. CONSTITUTION:Prescaler 6 to divide the oscillation frequency of local oscillator circuit 5 is provided along with programable divider 7, and the output of divider 7 is supplied to phase comparator 8. At the same time, the oscillation frequency of crystal oscillator 9 is divided via divider 11 and then supplied to comparator 8. Switch circuit 15 which can vary part of whole of the division ratio is provided to divider 11, and the output of comparator 8 is fed back to oscillator 5 via LPF12. Thus, a PLL circuit is formed. The solid state filter or the like is used for intermediate frequency filter 2 with no incapability to vary the central frequency, and part or whole of the division ratio of divider 11 is varied through circuit 15. and thus, the frequency of the PLL circuit is varied in accordance with the frequency of divider 11.
JP2869378A 1978-03-15 1978-03-15 Pll circuit of radio receiver Pending JPS54121610A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2869378A JPS54121610A (en) 1978-03-15 1978-03-15 Pll circuit of radio receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2869378A JPS54121610A (en) 1978-03-15 1978-03-15 Pll circuit of radio receiver

Publications (1)

Publication Number Publication Date
JPS54121610A true JPS54121610A (en) 1979-09-20

Family

ID=12255551

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2869378A Pending JPS54121610A (en) 1978-03-15 1978-03-15 Pll circuit of radio receiver

Country Status (1)

Country Link
JP (1) JPS54121610A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6221318A (en) * 1985-07-22 1987-01-29 Victor Co Of Japan Ltd Channel selection device
JPH03206731A (en) * 1990-01-08 1991-09-10 Matsushita Electric Ind Co Ltd Clock generator for pwm system digital analog converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6221318A (en) * 1985-07-22 1987-01-29 Victor Co Of Japan Ltd Channel selection device
JPH0315367B2 (en) * 1985-07-22 1991-02-28 Victor Company Of Japan
JPH03206731A (en) * 1990-01-08 1991-09-10 Matsushita Electric Ind Co Ltd Clock generator for pwm system digital analog converter

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