GB594028A - Crystal controlled oscillator - Google Patents

Crystal controlled oscillator

Info

Publication number
GB594028A
GB594028A GB15987/45A GB1598745A GB594028A GB 594028 A GB594028 A GB 594028A GB 15987/45 A GB15987/45 A GB 15987/45A GB 1598745 A GB1598745 A GB 1598745A GB 594028 A GB594028 A GB 594028A
Authority
GB
United Kingdom
Prior art keywords
frequency
circuit
feedback path
crystal
oscillator
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.)
Expired
Application number
GB15987/45A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB594028A publication Critical patent/GB594028A/en
Expired 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
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
    • H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
    • H03B5/34—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being vacuum tube
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

594,028. Valve generating circuits. STANDARD TELEPHONES & CABLES, Ltd. June 22, 1945, No. 15987. Convention date, March 19, 1944. [Class 40 (v)] A reaction oscillator is provided with a negative feedback path with means including a piezo-electric crystal for neutralising the degenerative effect at the resonant frequency to sustain oscillations at this frequency only. In the Figure, resistor 18 providestheregenerattive coupling for valve oscillator 8, and the negative feedback path comprises resistors 20, 21, which is rendered ineffective at the resonant frequency of circuit 1 by a piezoelectric crystal 22 tuned to the same frequency. The crystal also exerts the usual compensating inductive or capacitive effect in response to any frequency drift in circuit 1. An amplifier stage may be inserted in both feedback paths with a corresponding reversal of connections to the tuned circuit, or the amplifier may be in the positive feedback path only, when both paths terminate at point 6 (Figs. 2, 3, not shown). Multi - electrode valves may be used and the amplitude of oscillation may be regulated by employing resistors 18, 20, 21 with variable resistancecurrent characteristics.
GB15987/45A 1944-03-19 1945-06-22 Crystal controlled oscillator Expired GB594028A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US594028XA 1944-03-19 1944-03-19

Publications (1)

Publication Number Publication Date
GB594028A true GB594028A (en) 1947-10-31

Family

ID=22022718

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15987/45A Expired GB594028A (en) 1944-03-19 1945-06-22 Crystal controlled oscillator

Country Status (1)

Country Link
GB (1) GB594028A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225502A (en) * 1988-11-02 1990-05-30 Secr Defence L.F. noise reduction using negative feedback

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225502A (en) * 1988-11-02 1990-05-30 Secr Defence L.F. noise reduction using negative feedback

Similar Documents

Publication Publication Date Title
GB594028A (en) Crystal controlled oscillator
GB740417A (en) Improvements in or relating to high stability transistor oscillators
GB654684A (en) Improvements in or relating to generating oscillations
US2460637A (en) Oscillation generator
US2900608A (en) Modulating circuits
GB587399A (en) Improvements in crystal oscillation circuits
GB546319A (en) Improvements in piezo-electric circuits
GB534988A (en) Stabilised tuned system for high-frequency oscillations
GB569327A (en) Improvements relating to generators of frequency modulated oscillations
GB742897A (en) Improvements in or relating to electro-mechanically tuned amplifiers
GB658833A (en) Improvements relating to negative feedback amplifiers
US2460800A (en) Fractional frequency generator
US2638550A (en) Variable frequency oscillator
GB725849A (en) Crystal controlled electronic system
GB804472A (en) Improvements in or relating to transistor oscillators
GB586584A (en) Oscillation generator
US2457854A (en) Controllable output circuit
JPS5571327A (en) Micro wave oscillation unit
GB624692A (en) Improvements in or relating to electrical oscillators
GB590764A (en) Improvements in thermionic valve oscillation generators
GB1153232A (en) Improvements in or relating to Frequency Stabilising Circuit Arrangements for Crystal Oscillators
GB619520A (en) Improvements in or relating to electrical oscillation generators
GB627305A (en) Thermionic valve circuit arrangements for producing electrical oscillations
GB599963A (en) Improvements in or relating to thermionic valve oscillators
GB550171A (en) Circuit arrangements comprising at least one amplifier for amplitude modulated oscillations