GB1329621A - Rc sine wave oscillator - Google Patents

Rc sine wave oscillator

Info

Publication number
GB1329621A
GB1329621A GB4845270A GB4845270A GB1329621A GB 1329621 A GB1329621 A GB 1329621A GB 4845270 A GB4845270 A GB 4845270A GB 4845270 A GB4845270 A GB 4845270A GB 1329621 A GB1329621 A GB 1329621A
Authority
GB
United Kingdom
Prior art keywords
frequency
switching
oscillator
switch
adjustable
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
GB4845270A
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.)
Hasler AG
Original Assignee
Hasler AG
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 Hasler AG filed Critical Hasler AG
Publication of GB1329621A publication Critical patent/GB1329621A/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
    • H03B5/20—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
    • H03B5/26—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 frequency-determining element being part of bridge circuit in closed ring around which signal is transmitted; frequency-determining element being connected via a bridge circuit to such a closed ring, e.g. Wien-Bridge oscillator, parallel-T oscillator
    • 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
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/02—Generating pulses having essentially a finite slope or stepped portions having stepped portions, e.g. staircase waveform

Abstract

1329621 Frequency modulation; sine wave oscillators HASLER AG 12 Oct 1970 [14 Oct 1969] 48452/70 Headings H3R and H3T An RC sine wave oscillator with variable frequency comprises at least one electronic switch 5, 6 for periodically switching at least one frequency determining resistance between two values with a high switching frequency relative to the oscillator frequency and an adjustable keying ratio. The oscillator is repetitively switched between two frequencies by a control signal of high frequency and of an adjustable keying ratio so that a mean frequency of an adjustable value may be obtained. The control signal may be derived from an impulse generator, divider, gate circuit combination producing impulses with adjustable spacing. Alternatively, the control signal may be derived from rectangular impulses whose leading, trailing edges are dependent on the phase difference between two series of impulses or derived from the zero crossings of an A.C. signal or having a keying ratio linearly dependent on a measured variable. In a Wien bridge type of RC oscillator wherein resistances 11, 12 are periodically switched in and out of the circuit by electronic switches, the mean frequency depends on the switching rate. The switch may be constituted by an FET or by a bipolar transistor 20 controlled by a trigger circuit 23, 24 turned on and off by pulses e.g. from an impulse generator. The values of resistances 25, 26 are adjusted so that the emitter potential remains unaffected by the switching voltages. The switch may be arranged to pass A.C. signals as well as D.C. For switching large A.C. signals, the collector emitter path of a further transistor (32, Fig. 4, not shown) is connected in series with the base emitter path of switch transistor 20.
GB4845270A 1969-10-14 1970-10-12 Rc sine wave oscillator Expired GB1329621A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1529569A CH507617A (en) 1969-10-14 1969-10-14 RC sine wave oscillator of variable frequency

Publications (1)

Publication Number Publication Date
GB1329621A true GB1329621A (en) 1973-09-12

Family

ID=4407942

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4845270A Expired GB1329621A (en) 1969-10-14 1970-10-12 Rc sine wave oscillator

Country Status (8)

Country Link
BE (1) BE757497A (en)
CH (1) CH507617A (en)
CS (1) CS179910B2 (en)
DE (1) DE2021128A1 (en)
FR (1) FR2064316B1 (en)
GB (1) GB1329621A (en)
PL (1) PL81129B1 (en)
SE (1) SE348902B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513041A1 (en) * 1981-09-15 1983-03-18 Thomson Csf Mat Tel PLL varicap diode piezoelectric oscillator - has digital frequency divider feeding phase comparator supplied with reference to select correction speed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513041A1 (en) * 1981-09-15 1983-03-18 Thomson Csf Mat Tel PLL varicap diode piezoelectric oscillator - has digital frequency divider feeding phase comparator supplied with reference to select correction speed

Also Published As

Publication number Publication date
SE348902B (en) 1972-09-11
FR2064316A1 (en) 1971-07-23
FR2064316B1 (en) 1976-03-19
CS179910B2 (en) 1977-12-30
BE757497A (en) 1971-03-16
DE2021128A1 (en) 1971-04-15
PL81129B1 (en) 1975-08-30
CH507617A (en) 1971-05-15

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Legal Events

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