JPS5485091A - Frequency sweeping circuit - Google Patents

Frequency sweeping circuit

Info

Publication number
JPS5485091A
JPS5485091A JP15372977A JP15372977A JPS5485091A JP S5485091 A JPS5485091 A JP S5485091A JP 15372977 A JP15372977 A JP 15372977A JP 15372977 A JP15372977 A JP 15372977A JP S5485091 A JPS5485091 A JP S5485091A
Authority
JP
Japan
Prior art keywords
frequency
dividing
sweeping
counter
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
JP15372977A
Other languages
Japanese (ja)
Inventor
Hiroshi Yokogawa
Yoshiharu Uchiumi
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
Original Assignee
Hitachi 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 Ltd filed Critical Hitachi Ltd
Priority to JP15372977A priority Critical patent/JPS5485091A/en
Publication of JPS5485091A publication Critical patent/JPS5485091A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B23/00—Generation of oscillations periodically swept over a predetermined frequency range

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To obtain a stable modulation sweeping circuit suited for use in nuclear magnetic resonator and less susceptible to changes in ambient temperatures, by using digital circuits positively and reducing the number of parts. CONSTITUTION:The method of obtaining low frequencies from stable high frequencies by frequency dividing is capable of generating stable frequencies at high precision than in the method of VCO. This technique is used to constitute a modulation sweeping circuit with digital circuits. For instance, one output of the frequency source 18 is counted by an up-down counter 19, and the divided frequency is outputted. Due borrow or carrier output, a latch function is operated, so that a new set value may be set in the counter at the end of counting. The other output of the frequency source 18 passes through a frequency dividing counter 20. This dividing ratio is fixed. The final frquency dividing counter 21 should have variable dividing ratios. By thus constituting the circuit, the sweeping precision is enhanced, and the stability of the sweeping frequency may be also increased.
JP15372977A 1977-12-20 1977-12-20 Frequency sweeping circuit Pending JPS5485091A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15372977A JPS5485091A (en) 1977-12-20 1977-12-20 Frequency sweeping circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15372977A JPS5485091A (en) 1977-12-20 1977-12-20 Frequency sweeping circuit

Publications (1)

Publication Number Publication Date
JPS5485091A true JPS5485091A (en) 1979-07-06

Family

ID=15568811

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15372977A Pending JPS5485091A (en) 1977-12-20 1977-12-20 Frequency sweeping circuit

Country Status (1)

Country Link
JP (1) JPS5485091A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2600847A1 (en) * 1986-06-25 1987-12-31 Sfim SIGNAL GENERATING DEVICE WITH PROGRAMMABLE VARIABLE FREQUENCY

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2600847A1 (en) * 1986-06-25 1987-12-31 Sfim SIGNAL GENERATING DEVICE WITH PROGRAMMABLE VARIABLE FREQUENCY

Similar Documents

Publication Publication Date Title
JPS53130911A (en) Pll synthesizer
JPS55154449A (en) Nuclear magnetic resonance apparatus
JPS5485091A (en) Frequency sweeping circuit
JPS5335466A (en) Variable frequency oscillator circuit
JPS55124327A (en) Digital-analog converting circuit
JPS55417A (en) Frequency comparator circuit
SU702540A1 (en) Frequency manipulator
JPS5554463A (en) Measuring instrument for ratio of noise power to carrier
JPS5776930A (en) Frequency shift signal generating system using pll
JPS5357731A (en) Voltage-contro-type oscillation circuit
JPS5469052A (en) Frequency discriminating device
US3860890A (en) Temperature stable rc oscillator
JPS5673906A (en) Microwave oscillator
JPS5687924A (en) Phase comparison circuit
JPS5267675A (en) Electronic timepiece
JPS5643562A (en) Frequency counter
JPS55135428A (en) Pll frequency synthesizer device
JPS5448148A (en) A/d converter circuit
SOLIN Short-term frequency instability limit in quartz oscillators(Quartz oscillator short term frequency instability lower limit estimation by calculating Q values and nonlinearity and resonator parameter fluctuation effects)
JPS55115737A (en) Digital phase synchronism circuit
JPS5599835A (en) Frequency division cricuit
JPS54125077A (en) Time standard apparatus
JPS5623065A (en) Demodulation circuit for self clocking information signal
JPS5386273A (en) Electronic timepiece
JPS56125119A (en) Microwave phase synchronizing oscillator