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US5099142A Expired / Lapsed US ⏱️ 0.0 years remaining

Trigger circuit with switching hysteresis

Assignee: Siemens AG
•
Filing: 1990-09-11
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Granted: 1992-03-24
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Expires: 2010-09-11
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Abstract

Abstract A trigger circuit with switching hysteresis includes first, second and third current sources. A first transistor pair is supplied by the first current source and has transistors with coupled emitters, load circuits and input circuits. The input circuit of one of the transistors of the first pair is acted upon by a reference potential and the input circuit of the other of the transistors of the first pair being acted upon by an input signal. Load resistors are each connected in the load circuit of a respective one of the transistors of the first pair. A coupling resistor interconnects the load circuits of the transistors of the first pair. A second transistor pair is supplied by the second current source and has transistors with coupled emitters, load circuits directly coupled with corresponding load circuits of the transistors of the first pair and input circuits cross-coupled with corresponding load circuits of the transistors of the first pair. A third transistor pair is supplied by the third current source and has transistors with coupled emitters, load circuits and input circuits being coupled with corresponding load circuits of the transistors of the first pair. Further load resistors are each connected in the load circuit of a respective one of the transistors of the third pair.

Inventors

  • 👤 Claude Barre

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 20:25
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286; H03K3/2893; H03K3/2897

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 260 words
A trigger circuit with switching hysteresis comprising a first, second and third pair of transistors, each pair of transistors being emitter-coupled, each transistor having a respective emitter, base and collector; a first and a second supply potential, and (a) a first current source connecting the emitter of each of the first pair of transistors with said first supply potential, a first and a second load resistor connecting the respective collector of the first pair of transistors with said second supply potential, a coupling resistor connecting the collector of each of the first pair of transistors to one another, a controlling input signal connected to the base of one of the first pair of transistors and a reference potential connected to the base of the other one of the first pair of transistors; (b) a second current source connecting the emitter of each of the second pair of transistors with said first supply potential, the collector of each of the second pair of transistors connected with a respective collector of each of the first pair of transistors, and the base of each of the second pair transistors cross-connected with a respective collector of the first pair of transistors; and (c) a third current source connecting each emitter of the third pair of transistors to the first supply potential, two further load resistors connecting the second supply potential to a respective collector of said third pair of transistors, and the base of each of the third pair of transistors connected to a respective collector of each of the first pair of transistors.
Claim 2
Dependent Claim 260 words
A trigger circuit with switching hysteresis comprising a first, second and third pair of transistors, each pair of transistors being emitter-coupled, each transistor having a respective emitter, base and collector; a first and a second supply potential, and (a) a first current source connecting the emitter of each of the first pair of transistors with said first supply potential, a first and a second load resistor connecting the respective collector of the first pair of transistors with said second supply potential, a coupling resistor connecting the collector of each of the first pair of transistors to one another, a controlling input signal connected to the base of one of the first pair of transistors and a reference potential connected to the base of the other one of the first pair of transistors; (b) a second current source connecting the emitter of each of the second pair of transistors with said first supply potential, the collector of each of the second pair of transistors connected with a respective collector of each of the first pair of transistors, and the base of each of the second pair transistors cross-connected with a respective collector of the first pair of transistors; and (c) a third current source connecting each emitter of the third pair of transistors to the first supply potential, two further load resistors connecting the second supply potential to a respective collector of said third pair of transistors, and the base of each of the third pair of transistors connected to a respective collector of each of the first pair of transistors.
Claim 3
Dependent Claim 12 words
Trigger circuit according to claim 1, wherein the reference potential is adjustable.
Claim 4
Dependent Claim 17 words
Trigger circuit according to claim 1, wherein said third current source has a current which is adjustable.
Claim 5
Dependent Claim 23 words
Trigger circuit according to claim 1, wherein at least one of said second or third current sources has a current which is adjustable.

References Cited (Backward Citations)

US3728561A Cited
US4485312A Cited
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US4560888A Cited
US4601049A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-03-24 1995-09-23 1996-03-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-03-24 1999-09-23 2000-03-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-03-24 2003-09-23 2004-03-24 $7700.00 Window Closed / Lapsed

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