JPS5799007A - Voltage controlled variable frequency oscillator - Google Patents

Voltage controlled variable frequency oscillator

Info

Publication number
JPS5799007A
JPS5799007A JP17470280A JP17470280A JPS5799007A JP S5799007 A JPS5799007 A JP S5799007A JP 17470280 A JP17470280 A JP 17470280A JP 17470280 A JP17470280 A JP 17470280A JP S5799007 A JPS5799007 A JP S5799007A
Authority
JP
Japan
Prior art keywords
latch circuit
converter
converted
sinusoidal
voltage controlled
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
JP17470280A
Other languages
Japanese (ja)
Inventor
Atsushi Yamashita
Ryota Akiyama
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 JP17470280A priority Critical patent/JPS5799007A/en
Publication of JPS5799007A publication Critical patent/JPS5799007A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/0321—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers
    • G06F1/0328—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers in which the phase increment is adjustable, e.g. by using an adder-accumulator

Abstract

PURPOSE:To achieve a sinusoidal wave output with wide frequency changing width, low distortion and high S/N, by storing each sample value of sinusoidal waveform sampled with a prescribed interval and reading out it at every address interval corresponding to a control voltage. CONSTITUTION:A control voltage V1 is converted into a digital value at an AD converter 1 and set to a latch circuit 2. The content of the latch circuit 2 and a latch circuit 5 is added with an adder 3 at every clock period Tc with clock pulses CP and to a latch circuit 4. The content of the latch circuit 4 is used as an address data of a waveform storage device 6, and a sample value of sinusoidal waveform stored in the device 6 is read out and converted into an analog voltage at a DA converter 8 and outputted as a sinusoidal wave signal V2 via a low-pass filter 9 and a buffer amplifier 10.
JP17470280A 1980-12-12 1980-12-12 Voltage controlled variable frequency oscillator Pending JPS5799007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17470280A JPS5799007A (en) 1980-12-12 1980-12-12 Voltage controlled variable frequency oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17470280A JPS5799007A (en) 1980-12-12 1980-12-12 Voltage controlled variable frequency oscillator

Publications (1)

Publication Number Publication Date
JPS5799007A true JPS5799007A (en) 1982-06-19

Family

ID=15983165

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17470280A Pending JPS5799007A (en) 1980-12-12 1980-12-12 Voltage controlled variable frequency oscillator

Country Status (1)

Country Link
JP (1) JPS5799007A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113505A (en) * 1983-11-24 1985-06-20 Sony Corp Frequency synthesizer
JPS62276906A (en) * 1986-05-24 1987-12-01 Sony Corp Digital control oscillation circuit
JPH02280415A (en) * 1989-03-17 1990-11-16 John Fluke Mfg Co Inc Frequency converter
EP0486851A2 (en) * 1990-11-19 1992-05-27 Tektronix Inc. Direct digital synthesizer with feedback shift register

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113505A (en) * 1983-11-24 1985-06-20 Sony Corp Frequency synthesizer
JPS62276906A (en) * 1986-05-24 1987-12-01 Sony Corp Digital control oscillation circuit
JPH02280415A (en) * 1989-03-17 1990-11-16 John Fluke Mfg Co Inc Frequency converter
EP0486851A2 (en) * 1990-11-19 1992-05-27 Tektronix Inc. Direct digital synthesizer with feedback shift register

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