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JPS5520061A - Fm wave receiver - Google Patents

Fm wave receiver

Info

Publication number
JPS5520061A
JPS5520061A JP9310978A JP9310978A JPS5520061A JP S5520061 A JPS5520061 A JP S5520061A JP 9310978 A JP9310978 A JP 9310978A JP 9310978 A JP9310978 A JP 9310978A JP S5520061 A JPS5520061 A JP S5520061A
Authority
JP
Japan
Prior art keywords
phase
filter circuit
frequency
comparator
reception
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
JP9310978A
Other languages
Japanese (ja)
Inventor
Takuro Oguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9310978A priority Critical patent/JPS5520061A/en
Publication of JPS5520061A publication Critical patent/JPS5520061A/en
Pending legal-status Critical Current

Links

Landscapes

  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE: To eliminate the step-out by comparing the phase between the reception signal and the output signal of the voltage control oscillator and then providing the function which blocks the differential frequency between the reception signal and the interference wave to the filter circuit when the phase synchronization is secured by adding the result of the above mentioned phase comparison to the oscillator via the filter circuit.
CONSTITUTION: The reception wave from input terminal 10 is applied to phase comparator 13 via band pass filter circuit 11 and amplifier circuit 12 featuring the limiter and AGC functions. In addition, the output signal of VCO14 is applied to comparator 13 to cause the phase difference signal at comparator 13. The phase difference signal is then converted into the DC voltage through loop filter circuit 15' and applied to VCO14 via amplifier circuit 16. Thus the oscillation frequency is controlled toward the direction where the phase synchronization is applied, and the step-out is caused easily when the level of the reception wave is low. In this connection, the parallel T-type filter circuit which blocks the differential frequency between the reception signal frequency and the interference frequency is used for filter 15', thus preventing occurrence of the step-out.
COPYRIGHT: (C)1980,JPO&Japio
JP9310978A 1978-08-01 1978-08-01 Fm wave receiver Pending JPS5520061A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9310978A JPS5520061A (en) 1978-08-01 1978-08-01 Fm wave receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9310978A JPS5520061A (en) 1978-08-01 1978-08-01 Fm wave receiver

Publications (1)

Publication Number Publication Date
JPS5520061A true JPS5520061A (en) 1980-02-13

Family

ID=14073349

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9310978A Pending JPS5520061A (en) 1978-08-01 1978-08-01 Fm wave receiver

Country Status (1)

Country Link
JP (1) JPS5520061A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007104145A (en) * 2005-09-30 2007-04-19 Kenwood Corp Pll frequency synthesizer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007104145A (en) * 2005-09-30 2007-04-19 Kenwood Corp Pll frequency synthesizer

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