Patent US4517523A successfully refreshed from Google Patents.
US4517523A
Expired / Lapsed
US
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Oscilloscope trigger circuit combining wideband trigger signal amplification and trigger coupling mode selection
Assignee: Techsearch LLC
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Filing: 1983-10-03
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Granted: 1985-05-14
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Expires: 2003-10-03
Abstract
Abstract A trigger circuit for use in an oscilloscope comprises a DC amplifier for low frequency amplification and high-frequency amplifier arranged to provide wideband trigger signal amplification while providing typical trigger coupling modes, such as AC, DC, high-frequency reject, and low-frequency reject.
Inventors
- 👤 Frank Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:17
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/24; G01R13/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A wideband trigger circuit for an oscilloscope, comprising: an input terminal for receiving an input signal; an input impedance network including at least one DC signal path connected to said input terminal for providing a plurality of selectable input signal coupling modes; a low frequency amplifier coupled to said impedance network for amplifying low frequency components of said input signal; a high frquency amplifier having a first input AC coupled to said input terminal and a second input coupled to the output of said low frequency amplifier for amplifying high frequency components of said input signal and for adding the low and high frequency components; and means for selecting any one of said plurality of selectable input signal coupling modes thereby to establish the frequency response of said trigger circuit.
Claim 2
Dependent Claim
130 words
A wideband trigger circuit for an oscilloscope, comprising: an input terminal for receiving an input signal; an input impedance network including at least one DC signal path connected to said input terminal for providing a plurality of selectable input signal coupling modes; a low frequency amplifier coupled to said impedance network for amplifying low frequency components of said input signal; a high frquency amplifier having a first input AC coupled to said input terminal and a second input coupled to the output of said low frequency amplifier for amplifying high frequency components of said input signal and for adding the low and high frequency components; and means for selecting any one of said plurality of selectable input signal coupling modes thereby to establish the frequency response of said trigger circuit.
References Cited (Backward Citations)
US4368435A
Cited
US4418428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |