Patent US3701908A successfully refreshed from Google Patents.
US3701908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peak detector and amplifier circuit
Assignee: Applied Automation Inc
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Filing: 1971-02-01
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Granted: 1972-10-31
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Expires: 1991-02-01
Abstract
Abstract An output circuit is provided for use with a chromatographic analyzer. The analyzer output is amplified and passed through an attenuation network to an integrator. The output signal from the integrator is applied selectively through an amplifier to the input of the first amplifier to provide an automatic zero circuit. Additional differentiating, peak reading and storage circuits are selectively connected to the output of the integrator.
Inventors
- 👤 Harold M Neer
- 👤 Vern A Street
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:44
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8651; G01R; G01R19/00; G01R19/04; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186; G06G7/1865; G06G7/48; G06G7/75; G11; G11C; G11C27/00; G11C27/02; G11C27/024; G11C27/026
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A detector circuit adapted for use in a chromatographic analyzer comprising: a first amplifier adapted to receive at its input a signal from a chromatographic analyzer; a second amplifier including a capacitor and first switching means to connect the capacitor selectively between the output and the input of said second amplifier to provide an integrator when the capacitor is so connected; an attenuation network including second switching means to connect said network selectively betWeen the output of said first amplifier and the input of said second amplifier; a third amplifier; third switching means to connect said third amplifier selectively between the output of said second amplifier and the input of said first amplifier to apply a feedback signal from the output of said second amplifier through said third amplifier to the input of said first amplifier; and signal storage means connected to the input of said first amplifier to store a signal representative of the output signal from said third amplifier.
Claim 2
Dependent Claim
161 words
A detector circuit adapted for use in a chromatographic analyzer comprising: a first amplifier adapted to receive at its input a signal from a chromatographic analyzer; a second amplifier including a capacitor and first switching means to connect the capacitor selectively between the output and the input of said second amplifier to provide an integrator when the capacitor is so connected; an attenuation network including second switching means to connect said network selectively betWeen the output of said first amplifier and the input of said second amplifier; a third amplifier; third switching means to connect said third amplifier selectively between the output of said second amplifier and the input of said first amplifier to apply a feedback signal from the output of said second amplifier through said third amplifier to the input of said first amplifier; and signal storage means connected to the input of said first amplifier to store a signal representative of the output signal from said third amplifier.
Claim 3
Dependent Claim
101 words
The circuit of claim 1 wherein said third amplifier includes a differential amplifier having first and second inputs, first and second metal-oxide-semiconductor field effect transistors, means to connect the gate of said first transistor to the output of said second amplifier, means to connect the gate of said second transistor and the substrate and source electrodes of said first and second transistors to a point of reference potential, and means connecting the drain electrodes of said first and second transistors to the respective inputs of said differential amplifier, the output of said differential amplifier representing the output of said third amplifier.
Claim 4
Dependent Claim
28 words
The circuit of claim 2 wherein said storage means comprises a capacitor connected between the input of said first amplifier and the first input of said differential amplifier.
Claim 5
Dependent Claim
18 words
The circuit of claim 1, further comprising a differentiating circuit connected to the output of said second amplifier.
Claim 6
Dependent Claim
25 words
The circuit of claim 4 wherein said differentiating circuit comprises an operational amplifier having a feedback resistor and having a capacitor in the input thereof.
Claim 7
Dependent Claim
19 words
The circuit of claim 1, further comprising a signal storage circuit connected to the output of said second amplifier.
Claim 8
Dependent Claim
144 words
The circuit of claim 6 wherein said signal storage circuit comprises a second capacitor, a fourth differential amplifier, means connecting the output of said second amplifier to one input of said fourth amplifier and means connecting the other input of the fourth amplifier to a point of reference potential, switching means to connect said second capacitor selectively between the output and one of the inputs of said fourth amplifier, a fifth amplifier having the input thereof connected to one terminal of said second capacitor, the output of said fifth amplifier representing the output of said storage circuit, a sixth differential amplifier having the output thereof connected to the second terminal of said second capacitor, means connecting the output of said fifth amplifier to one input of said sixth amplifier, means connecting the second input of said sixth amplifier to a point of reference potential.
Claim 9
Dependent Claim
19 words
The circuit of claim 1, further comprising a peak indicating circuit connected to the output of said second amplifier.
Claim 10
Dependent Claim
97 words
The circuit of claim 8 wherein said peak indicating circuit comprises a fourth differential amplifier, means connecting the output of said second amplifier to one input of said fourth amplifier, a fifth amplifier, the output of said fifth amplifier representing the output of said peak indicating circuit, circuit means including a diode connecting the output of said fourth amplifier to the input of said fifth amplifier, means connecting the output of said fifth amplifier to the second input of said fourth amplifier, and a second capacitor connected between the output and the input of said fifth amplifier.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |