Patent US4499386A successfully refreshed from Google Patents.
US4499386A
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US
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Trigger circuit
Assignee: Tektronix Inc
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Filing: 1982-11-26
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Granted: 1985-02-12
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Expires: 2002-11-26
Abstract
Abstract A trigger circuit including arm and trigger comparators which are responsive to the push-pull output from a differential amplifier but insensitive to its common mode component. A controllable hysteresis insertion circuit is also included in the circuit for noise rejection and sensitivity control purposes.
Inventors
- 👤 Kenneth G. Schlotzhauer
- 👤 Arthur J. Metz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:56
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
101 words
A trigger circuit, comprising: a differential amplifier responsive to an input signal from an input means; first and second comparators to receive as one input at a first input terminal in each the push-pull output of said differential amplifier; a hysteresis circuit responsive to the common mode component of the push-pull output of said differential amplifier and applying a predetermined hysteresis level to be applied in common to a second input of both said first and second comparators, and a logic circuit responsive to the outputs of said first and second comparators from providing a trigger signal at an output terminal.
Claim 2
Dependent Claim
101 words
A trigger circuit, comprising: a differential amplifier responsive to an input signal from an input means; first and second comparators to receive as one input at a first input terminal in each the push-pull output of said differential amplifier; a hysteresis circuit responsive to the common mode component of the push-pull output of said differential amplifier and applying a predetermined hysteresis level to be applied in common to a second input of both said first and second comparators, and a logic circuit responsive to the outputs of said first and second comparators from providing a trigger signal at an output terminal.
Claim 3
Dependent Claim
39 words
The trigger circuit according to claim 1 wherein said hysteresis circuit comprises a pair of resistors connected in series between the output terminals of said differential amplifier and a current source connected to the common node of said resistors.
Claim 4
Dependent Claim
13 words
The trigger circuit according to claim 2 wherein said current source is controllable.
Claim 5
Dependent Claim
30 words
The trigger circuit according to claim 1 wherein said input means including a switching circuit for selecting first and second trigger signal sources to be coupled to said differential amplifer.
Claim 6
Dependent Claim
15 words
The trigger circuit according to claim 4 wherein said switching circuit is an electronic switch.
Claim 7
Dependent Claim
43 words
The trigger circuit according to claim 4 further including an adder to add trigger signals from said first and second trigger signal sources and said switching circuit further selecting one of the first and second trigger signals and the output from said adder.
Claim 8
Dependent Claim
28 words
The trigger circuit according to claim 1 wherein said logic circuit includes first and second flip-flop circuits each responsive to the outputs of said first and second comparators.
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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) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |