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GB725849A - Crystal controlled electronic system - Google Patents

Crystal controlled electronic system

Info

Publication number
GB725849A
GB725849A GB8969/53A GB896953A GB725849A GB 725849 A GB725849 A GB 725849A GB 8969/53 A GB8969/53 A GB 8969/53A GB 896953 A GB896953 A GB 896953A GB 725849 A GB725849 A GB 725849A
Authority
GB
United Kingdom
Prior art keywords
valve
crystal
voltage
grid
negative capacitance
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
GB8969/53A
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.)
SIERRA ELECTRONIC CORP
Original Assignee
SIERRA ELECTRONIC CORP
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 SIERRA ELECTRONIC CORP filed Critical SIERRA ELECTRONIC CORP
Publication of GB725849A publication Critical patent/GB725849A/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

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)

Abstract

725,849. Valve generating circuits. SIERRA ELECTRONIC CORPORATION. March 31, 1953 [April 15, 1952], No. 8969/53. Classes 40 (5) and 40 (6). A crystal-controlled oscillator has a negative capacitance in shunt with the crystal to alter the frequency of oscillation. The oscillator shown comprises a cathode coupled pair of valves 24, 26 having a crystal 11 connected to one grid. The negative capacitance comprises a two-valve amplifier 22, 21 having a voltage fed back to the grid of valve 22 through a 90 degrees phase shifter 32, 33. Varying the gain of this amplifier as by varying the grid voltage of the valve 22 varies the magnitude of the negative capacitance and thus the frequency of the oscillator. The variation may be effected by a modulating voltage from a source 63 or by a key 57 which is connected to two voltage sources to produce frequency shift keying.
GB8969/53A 1952-04-15 1953-03-31 Crystal controlled electronic system Expired GB725849A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US725849XA 1952-04-15 1952-04-15

Publications (1)

Publication Number Publication Date
GB725849A true GB725849A (en) 1955-03-09

Family

ID=22108549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8969/53A Expired GB725849A (en) 1952-04-15 1953-03-31 Crystal controlled electronic system

Country Status (1)

Country Link
GB (1) GB725849A (en)

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