JPS5691538A - Pll frequency synthesizer tuner - Google Patents

Pll frequency synthesizer tuner

Info

Publication number
JPS5691538A
JPS5691538A JP16839679A JP16839679A JPS5691538A JP S5691538 A JPS5691538 A JP S5691538A JP 16839679 A JP16839679 A JP 16839679A JP 16839679 A JP16839679 A JP 16839679A JP S5691538 A JPS5691538 A JP S5691538A
Authority
JP
Japan
Prior art keywords
output
count
prescaler
frequency
program counter
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
JP16839679A
Other languages
Japanese (ja)
Inventor
Tadashi Nakagawa
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.)
Hitachi Ltd
Renesas Eastern Japan Semiconductor Inc
Original Assignee
Hitachi Tokyo Electronics Co Ltd
Hitachi Ltd
Hitachi Ome Electronic 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 Hitachi Tokyo Electronics Co Ltd, Hitachi Ltd, Hitachi Ome Electronic Co Ltd filed Critical Hitachi Tokyo Electronics Co Ltd
Priority to JP16839679A priority Critical patent/JPS5691538A/en
Publication of JPS5691538A publication Critical patent/JPS5691538A/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
    • H03L7/193—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 the frequency divider/counter comprising a commutable pre-divider, e.g. a two modulus divider

Abstract

PURPOSE:To perform stable channel selecting operation by changing frequency dividing ratios of a prescaler by receiving N-1 count output of a program counter. CONSTITUTION:This tuner is provided with flip-flop circuit 6 that receives N-1 count detection output (a) in response to the N-value set output of program counter 4 and then regards output (phi) of prescaler 3 as a clock signal, and the frequency- dividing-ratio changeover signal of prescaler 3 is generated by its output. Program counters 4 and 5 are reset by the M count output of program counter 5 set to count value M. The output of counter 5 is compared with the frequency division output of oscillator 8 by phase comparator 7 to control local oscillating circuit 2, receiving a signal of a desired frequency.
JP16839679A 1979-12-26 1979-12-26 Pll frequency synthesizer tuner Pending JPS5691538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16839679A JPS5691538A (en) 1979-12-26 1979-12-26 Pll frequency synthesizer tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16839679A JPS5691538A (en) 1979-12-26 1979-12-26 Pll frequency synthesizer tuner

Publications (1)

Publication Number Publication Date
JPS5691538A true JPS5691538A (en) 1981-07-24

Family

ID=15867333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16839679A Pending JPS5691538A (en) 1979-12-26 1979-12-26 Pll frequency synthesizer tuner

Country Status (1)

Country Link
JP (1) JPS5691538A (en)

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