JPS5520066A - Pll frequency synthesizer device - Google Patents

Pll frequency synthesizer device

Info

Publication number
JPS5520066A
JPS5520066A JP9342978A JP9342978A JPS5520066A JP S5520066 A JPS5520066 A JP S5520066A JP 9342978 A JP9342978 A JP 9342978A JP 9342978 A JP9342978 A JP 9342978A JP S5520066 A JPS5520066 A JP S5520066A
Authority
JP
Japan
Prior art keywords
divider
terminal
output terminal
input terminal
circuit
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
JP9342978A
Other languages
Japanese (ja)
Inventor
Tadashi Kojima
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP9342978A priority Critical patent/JPS5520066A/en
Publication of JPS5520066A publication Critical patent/JPS5520066A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To simplify the circuit constitution with omission of the reference oscillater except for the PLL reference oscillator by providing the selector to select 5KHz and 1KHz to the synthesizer for the SW (short wave) broadcast which occupies the channel space for 5KHz and 1KHz. CONSTITUTION:The output terminal of voltage control oscillator 31 is connectd to the mixer part of the SW broadcast tuner as well as to the input terminal of programmable divider 32. Then the output terminal of divider 32 is connected to one end of the input terminal of phase comparator 33, and the other end of comparator 33 is connected to the output terminal of reference oscillator 34 via selector 35. Then the output terminal is connected to the input terminal of oscillator 31 via low-pass filter 36. On the other hand, the 5-bit control data is supplied to the division ratio control data input terminal of divider 32 via divider circuit 38 and then detected by detector 37 to be applied to the control terminal of selector 35 as well as to the control terminal of circuit 38. In such way, the signals of 1KHz or 5KHz are obtained, simplifying the circuit constitution.
JP9342978A 1978-07-31 1978-07-31 Pll frequency synthesizer device Pending JPS5520066A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9342978A JPS5520066A (en) 1978-07-31 1978-07-31 Pll frequency synthesizer device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9342978A JPS5520066A (en) 1978-07-31 1978-07-31 Pll frequency synthesizer device

Publications (1)

Publication Number Publication Date
JPS5520066A true JPS5520066A (en) 1980-02-13

Family

ID=14082054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9342978A Pending JPS5520066A (en) 1978-07-31 1978-07-31 Pll frequency synthesizer device

Country Status (1)

Country Link
JP (1) JPS5520066A (en)

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