GB1402546A - Adjustable frequency oscillator - Google Patents

Adjustable frequency oscillator

Info

Publication number
GB1402546A
GB1402546A GB3323671A GB3323671A GB1402546A GB 1402546 A GB1402546 A GB 1402546A GB 3323671 A GB3323671 A GB 3323671A GB 3323671 A GB3323671 A GB 3323671A GB 1402546 A GB1402546 A GB 1402546A
Authority
GB
United Kingdom
Prior art keywords
output
integrator
transformer
coupling
feedback
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
GB3323671A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical 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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB3323671A priority Critical patent/GB1402546A/en
Priority to FR7225049A priority patent/FR2145583B1/fr
Priority to DE19722234757 priority patent/DE2234757A1/en
Priority to CA147,189A priority patent/CA987008A/en
Priority to IT2697872A priority patent/IT962837B/en
Priority to JP47071186A priority patent/JPS5818014B2/en
Priority to US415320A priority patent/US3883826A/en
Publication of GB1402546A publication Critical patent/GB1402546A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/066—Generating pulses having essentially a finite slope or stepped portions having triangular shape using a Miller-integrator
    • 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
    • H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
    • H03B5/24—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being semiconductor device
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/94—Generating pulses having essentially a finite slope or stepped portions having trapezoidal shape

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

1402546 Transducer circuits IMPERIAL CHEMICAL INDUSTRIES Ltd 13 July 1972 [15 July 1971] 33236/71 Heading G1N [Also in Divisions H3 and H4] A transducer controlled variable frequency oscillator comprises a capacitive feedback integrator 12 followed by a Schmitt type switch 10 providing a bi-polar output which switches when the input is a predetermined fraction of and of opposite polarity to the output, and a variable coupling unit including a transformer L 1 coupling the output of the switch to the input of the integrator. Zener diodes 24 limit the output levels of the switch and a resistor R4 in the feedback path of the integrator advances the phase and so steepens the output edges. In order to maintain positive feedback when the output of the transformer is pbsitive or negative the integrator is biased by means of a resistor R5 which may be variable continuously or discretely. The coupling unit includes an amplifier 34 having a feedback circuit matched in time constant to that of the transformer to compensate for low frequency loss. As shown, the coupling is varied by means of a core 32 sensitive to the load or pressure but in Fig. 6 (not shown) the secondary of the transformer feeds into a bridge network which responds to a quantity to be measured to effect the variation.
GB3323671A 1971-07-15 1971-07-15 Adjustable frequency oscillator Expired GB1402546A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB3323671A GB1402546A (en) 1971-07-15 1971-07-15 Adjustable frequency oscillator
FR7225049A FR2145583B1 (en) 1971-07-15 1972-07-11
DE19722234757 DE2234757A1 (en) 1971-07-15 1972-07-14 ADJUSTABLE FREQUENCY OSCILLATOR
CA147,189A CA987008A (en) 1971-07-15 1972-07-14 Adjustable frequency oscillator
IT2697872A IT962837B (en) 1971-07-15 1972-07-14 VARIABLE FREQUENCY OSCILLATOR
JP47071186A JPS5818014B2 (en) 1971-07-15 1972-07-15 variable frequency oscillator
US415320A US3883826A (en) 1971-07-15 1973-11-13 Adjustable frequency oscillator with regenerative feedback and a coupling unit including a differential amplifier for adjusting the feedback

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3323671A GB1402546A (en) 1971-07-15 1971-07-15 Adjustable frequency oscillator

Publications (1)

Publication Number Publication Date
GB1402546A true GB1402546A (en) 1975-08-13

Family

ID=10350312

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3323671A Expired GB1402546A (en) 1971-07-15 1971-07-15 Adjustable frequency oscillator

Country Status (6)

Country Link
JP (1) JPS5818014B2 (en)
CA (1) CA987008A (en)
DE (1) DE2234757A1 (en)
FR (1) FR2145583B1 (en)
GB (1) GB1402546A (en)
IT (1) IT962837B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2726894A1 (en) * 1977-06-15 1979-01-04 Bosch Gmbh Robert CIRCUIT DEVICE FOR CONVERTING AN INDUCTIVITY VALUE INTO A SPECIFIC FREQUENCY
DE4220596C1 (en) * 1992-06-24 1993-12-09 Mfp Mestechnik Und Fertigungst Transmission factor measuring circuit for variable transmission circuit e.g. differential transformer path sensor - determines factor from difference in period of oscillation of series integrator and comparator oscillator when circuit is connected and disconnected.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4425765Y1 (en) * 1967-09-26 1969-10-29

Also Published As

Publication number Publication date
CA987008A (en) 1976-04-06
JPS4857569A (en) 1973-08-13
FR2145583A1 (en) 1973-02-23
FR2145583B1 (en) 1976-05-14
DE2234757A1 (en) 1973-02-01
JPS5818014B2 (en) 1983-04-11
IT962837B (en) 1973-12-31

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee