FR2373195A1 - Transistor switching circuit for ultrasonic generator - has each transistor switch emitter-base path shunted by bridging transistor to prevent inadvertent triggering of switch - Google Patents

Transistor switching circuit for ultrasonic generator - has each transistor switch emitter-base path shunted by bridging transistor to prevent inadvertent triggering of switch

Info

Publication number
FR2373195A1
FR2373195A1 FR7700847A FR7700847A FR2373195A1 FR 2373195 A1 FR2373195 A1 FR 2373195A1 FR 7700847 A FR7700847 A FR 7700847A FR 7700847 A FR7700847 A FR 7700847A FR 2373195 A1 FR2373195 A1 FR 2373195A1
Authority
FR
France
Prior art keywords
transistor
switch
bridging
emitter
switching circuit
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.)
Pending
Application number
FR7700847A
Other languages
French (fr)
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of FR2373195A1 publication Critical patent/FR2373195A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/34—Sound-focusing or directing, e.g. scanning using electrical steering of transducer arrays, e.g. beam steering
    • G10K11/341—Circuits therefor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/16—Modifications for eliminating interference voltages or currents
    • 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
    • H03K17/68—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 specially adapted for switching ac currents or voltages

Abstract

The transistor switching circuit, for an ultrasound generator, is designed to avoid self-excitation and has a bridging switch (T8, T9) between the base and emitter of the switching transistor (T1, T2). This bridging switch prevents jumps in the signal voltage being coupled via stray capacitance from collector or emitter to the base and consequently operating the switching transistor. If the switching circuit contains two transistor switches in series and of opposite conduction type then each has a bridging transistor. Each bridging transistor has its emitter/base junction shunted by a low-ohmic resistor and a parallel diode (D11, D10).
FR7700847A 1976-12-06 1977-01-13 Transistor switching circuit for ultrasonic generator - has each transistor switch emitter-base path shunted by bridging transistor to prevent inadvertent triggering of switch Pending FR2373195A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762655173 DE2655173C3 (en) 1976-12-06 1976-12-06 Switching device with at least one transistor

Publications (1)

Publication Number Publication Date
FR2373195A1 true FR2373195A1 (en) 1978-06-30

Family

ID=5994772

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7700847A Pending FR2373195A1 (en) 1976-12-06 1977-01-13 Transistor switching circuit for ultrasonic generator - has each transistor switch emitter-base path shunted by bridging transistor to prevent inadvertent triggering of switch

Country Status (2)

Country Link
DE (1) DE2655173C3 (en)
FR (1) FR2373195A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635930A1 (en) * 1988-08-31 1990-03-02 Sgs Thomson Microelectronics MONOLITHIC TWO-WAY SWITCH WITH POWER MOS TRANSISTORS

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3340034A1 (en) * 1983-11-05 1985-05-23 Telefunken electronic GmbH, 7100 Heilbronn Bipolar analog switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635930A1 (en) * 1988-08-31 1990-03-02 Sgs Thomson Microelectronics MONOLITHIC TWO-WAY SWITCH WITH POWER MOS TRANSISTORS
EP0362080A1 (en) * 1988-08-31 1990-04-04 STMicroelectronics S.A. Monolithic bidirectional switch with MOS power transistors
US5003246A (en) * 1988-08-31 1991-03-26 Sgs-Thomson Microelectronics S.A. Monolithic bidirectional switch with power MOS transistors

Also Published As

Publication number Publication date
DE2655173C3 (en) 1980-01-10
DE2655173B2 (en) 1979-05-17
DE2655173A1 (en) 1978-06-08

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