US4647862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trigger holdoff system for a digital oscilloscope
Assignee: Tektronix Inc
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Filing: 1984-09-04
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Granted: 1987-03-03
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Expires: 2004-09-04
Abstract
Abstract A trigger holdoff system particularly useful in digital oscilloscopes is provided in which a holdoff pulse is generated in response to a trigger pulse from a trigger generator and applied to the trigger generator to disable a time base control circuit.
Inventors
- 👤 Bruce W. Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:11
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/023; G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A trigger holdoff system for a digital oscilloscope, comprising: a trigger generator for generating a trigger pulse at a preselected point on a signal input waveform; a digital time base control circuit responsive to said trigger pulse for generating sample clock pulses; sampling means responsive to said sample clock pulses for sampling said signal input waveform; and a holdoff circuit for generating a holdoff pulse in response to said trigger pulse to inhibit further trigger pulses from said trigger generator for a preselectable time duration.
Claim 2
Dependent Claim
85 words
A trigger holdoff system for a digital oscilloscope, comprising: a trigger generator for generating a trigger pulse at a preselected point on a signal input waveform; a digital time base control circuit responsive to said trigger pulse for generating sample clock pulses; sampling means responsive to said sample clock pulses for sampling said signal input waveform; and a holdoff circuit for generating a holdoff pulse in response to said trigger pulse to inhibit further trigger pulses from said trigger generator for a preselectable time duration.
Claim 3
Dependent Claim
58 words
A trigger holdoff system in accordance with claim 1, wherein said holdoff circuit includes a first logic circuit for receiving said trigger pulses, a timing circuit for generating a pulse having a programmable duration and a second logic circuit for generating said holdoff pulse in response to the outputs of said first logic circuit and said timing circuit.
Claim 4
Dependent Claim
19 words
A trigger holdoff system in accordance with claim 2, wherein said first and second logic circuits are flip flops.
Claim 5
Dependent Claim
48 words
A trigger holdoff system in accordance with claim 2, wherein said timing circuit includes a programmable current source, a timing capacitor charged by said programmable current source, a timing switch means connected across said timing capacitor, and comparators for receiving a voltage ramp signal across said timing capacitor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |