GB999290A - Improvements in or relating to crystal oscillators - Google Patents

Improvements in or relating to crystal oscillators

Info

Publication number
GB999290A
GB999290A GB3201761A GB3201761A GB999290A GB 999290 A GB999290 A GB 999290A GB 3201761 A GB3201761 A GB 3201761A GB 3201761 A GB3201761 A GB 3201761A GB 999290 A GB999290 A GB 999290A
Authority
GB
United Kingdom
Prior art keywords
crystal
base
positive feedback
sept
diodes
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
GB3201761A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB999290A publication Critical patent/GB999290A/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
    • H03B5/36—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 semiconductor device

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

999, 290. Automatic voltage control. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Sept. 6, 1961 [Sept. 9, 1960], No. 32017/61. Heading G3R. [Also in Division H3] A crystal controlled oscillator, comprising two transistors 1, 2 having the collector of the first DC. coupled to the base of the second, the emitter of the second connected to the base of the first, and a positive feedback path from the collector of the second to the base of the first, is characterized in that a crystal 8 is connected in parallel with a resistance 3,10 in the emitter circuit of the second transistor to reduce the negative feedback at the oscillating frequency. The crystal 8 may be connected in series with a resonant circuit 13 as shown, or with a reactance, Fig. 1 (not shown) and the positive feedback is developed across a resonant circuit 5. The oscillator output is amplified by transistor 14, and rectified by diode 16 to provide a D.C. control signal which is fedback to control the conductivity of a pair of diodes 19, 20 in the positive feedback path so as to stabilize the amplitude of oscillation. These diodes are biased to operate on the exponential part of their characteristics and are arranged so that the current distribution between them is substantially distortion free.
GB3201761A 1963-09-09 1961-09-06 Improvements in or relating to crystal oscillators Expired GB999290A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL255784 1963-09-09

Publications (1)

Publication Number Publication Date
GB999290A true GB999290A (en) 1965-07-21

Family

ID=19752558

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3201761A Expired GB999290A (en) 1963-09-09 1961-09-06 Improvements in or relating to crystal oscillators

Country Status (1)

Country Link
GB (1) GB999290A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580320A1 (en) * 1992-07-10 1994-01-26 Hughes Aircraft Company High performance oscillator with low frequency pulling at turn on

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0580320A1 (en) * 1992-07-10 1994-01-26 Hughes Aircraft Company High performance oscillator with low frequency pulling at turn on

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