JPS5714220A - Phase-synchronous oscillator - Google Patents

Phase-synchronous oscillator

Info

Publication number
JPS5714220A
JPS5714220A JP8938280A JP8938280A JPS5714220A JP S5714220 A JPS5714220 A JP S5714220A JP 8938280 A JP8938280 A JP 8938280A JP 8938280 A JP8938280 A JP 8938280A JP S5714220 A JPS5714220 A JP S5714220A
Authority
JP
Japan
Prior art keywords
converter
bits
order digit
phase
vcxo3
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
JP8938280A
Other languages
Japanese (ja)
Inventor
Takayuki Okino
Haruo Tsuda
Toshio Iyota
Ryoichi Shinoda
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 JP8938280A priority Critical patent/JPS5714220A/en
Publication of JPS5714220A publication Critical patent/JPS5714220A/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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal

Abstract

PURPOSE:To facilitate adjustments by simplifying a DA converter for the low-order bits. CONSTITUTION:The high-order digit bits 1-m of the output of a digital phase comparator 1 are DA-converted by a DA converter 4, and the low-order digit bits m+1-n by a DA converter 5. Analog outputs of the DA conversion are added together by an adding circuit 6, and the sum is applied to a voltage-controlled quartz oscillator VCXO3, whose oscillation frequency is controlled, so that the output signal of the VCXO3 phase-synchronizes with an input signal. As the DA converter 4, a high-precision DA converter of a ladder type, etc., is used, but it is only for the high-order digit bits, so the width of a stairecase-shaped step is large and adjustments for linear operation are easily. As the DA converter 5, on the other hand, a converter is used which varies the duty of pulses and converts them into an analog signal.
JP8938280A 1980-06-30 1980-06-30 Phase-synchronous oscillator Pending JPS5714220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8938280A JPS5714220A (en) 1980-06-30 1980-06-30 Phase-synchronous oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8938280A JPS5714220A (en) 1980-06-30 1980-06-30 Phase-synchronous oscillator

Publications (1)

Publication Number Publication Date
JPS5714220A true JPS5714220A (en) 1982-01-25

Family

ID=13969114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8938280A Pending JPS5714220A (en) 1980-06-30 1980-06-30 Phase-synchronous oscillator

Country Status (1)

Country Link
JP (1) JPS5714220A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59198028A (en) * 1983-04-26 1984-11-09 Anritsu Corp Phase locked circuit
JP2010010773A (en) * 2008-06-24 2010-01-14 Kyoraku Sangyo Kk Pll control device and control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59198028A (en) * 1983-04-26 1984-11-09 Anritsu Corp Phase locked circuit
JP2010010773A (en) * 2008-06-24 2010-01-14 Kyoraku Sangyo Kk Pll control device and control method

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