Patent US3768028A successfully refreshed from Google Patents.
US3768028A
Expired / Lapsed
US
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A.c.-d.c. amplifier system
Assignee: OPTIMATION Inc
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Filing: 1972-03-22
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Granted: 1973-10-23
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Expires: 1992-03-22
Abstract
Abstract A wide-band a.c., stable d.c., amplifier system employing a wide-band operational amplifier and an integrator-feedback highgain essentially d.c.-amplifying operational amplifier. The system provides uniform gain over a wide band of frequencies, including low frequencies and d.c., with precise stability useful for instrumentation. Indication of abnormal operation is available.
Inventors
- 👤 H Wolcott
- 👤 L Goldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:10
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03F1/083; H03F1/42; H03F1/48; H03F1/486; H03F3/00; H03F3/34; H03F3/343; H03F3/345
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
Apparatus for equally amplifying alternating and invariable voltages, comprising; a. an a.c. - d.c. wide-band amplifier (4), having differential inverting and non-inverting inputs and an output (5), b. adjustment means (9,14), connected between the signal input terminal of said apparatus feeding said inverting input and the output of said a.c. - d.c. amplifier, c. a d.c. amplifier (10), having an input continuously connected to said adjustment means and having an output connected to said non-inverting input of said a.c. - d.c. amplifier, and d. integrating means (11), connected across said d.c. amplifier, whereby said d.c. amplifier is constituted to amplify invariable and slowly varying voltages for the control of said a.c. - d.c. amplifier (4).
Claim 2
Dependent Claim
115 words
Apparatus for equally amplifying alternating and invariable voltages, comprising; a. an a.c. - d.c. wide-band amplifier (4), having differential inverting and non-inverting inputs and an output (5), b. adjustment means (9,14), connected between the signal input terminal of said apparatus feeding said inverting input and the output of said a.c. - d.c. amplifier, c. a d.c. amplifier (10), having an input continuously connected to said adjustment means and having an output connected to said non-inverting input of said a.c. - d.c. amplifier, and d. integrating means (11), connected across said d.c. amplifier, whereby said d.c. amplifier is constituted to amplify invariable and slowly varying voltages for the control of said a.c. - d.c. amplifier (4).
Claim 3
Dependent Claim
29 words
Apparatus according to claim 1, in which said integrating means is comprised of; a. a capacitor (11), connected between the input and the output of said d.c. amplifier (10).
Claim 4
Dependent Claim
51 words
Apparatus according to claim 1, which additionally includes; a. a resistor (15), connected between the output of said d.c. amplifier (10) and the non-inverting input of said a.c. - d.c. amplifier (4), and b. a capacitor (16), connected between the non-inverting input of said a.c. - d.c. amplifier (4) and ground.
Claim 5
Dependent Claim
55 words
Apparatus according to claim 1, in which said adjustment means is comprised of; a. a voltage divider, connected between the output terminal (5) and the input terminal (1) of said apparatus, and b. an adjustable tap (12), on said voltage divider is continuously connected to an inverting input terminal (''''-'''') of said d.c. amplifier (10).
Claim 6
Dependent Claim
59 words
Apparatus according to claim 1, in which; a. said d.c. amplifier (10) in relation to said integrating means (11) is constituted to have an upper frequency limit of amplification within the range of from less than one to approximately fifty hertz, whereby fidelity of output with respect to d.c. offset is obtained at the output (5) of said apparatus.
Claim 7
Dependent Claim
67 words
Apparatus according to claim 1, in which; a. said d.c. amplifier (10) in relation to said integration means (11) is constituted to have an upper frequency limit of amplification that is a sigNificant fraction of the upper frequency limit of amplification of said a.c.-d.c. amplifier (4), whereby effective zero output impedance of the system is secured through the control of said a.c.-d.c. amplifier by said d.c. amplifier.
Claim 8
Dependent Claim
71 words
Apparatus according to claim 1 which additionally includes; a. a differential output to said a.c. - d.c. amplifier (4''), b. one transistor (30) connected to said differential output, and c. a resistor (32) connected to said transistor and to a source of electrical energy (33), whereby the resting potential at the connection between said transistor and resistor is different from that at the output of said a.c. - d.c. amplifier (4'').
Claim 9
Dependent Claim
56 words
Apparatus according to claim 1 which additionally includes; a. voltage-shifting means (40) connected between the output of said a.c. - d.c. amplifier (4'') and the output (5'') of the whole apparatus, and b. a resistor (42) connected to said voltage-shifting means and to a source of electrical energy (43) to eliminate d.c. offset at said output.
Claim 10
Dependent Claim
64 words
Apparatus according to claim 1 which additionally includes; a. a voltage comparator (51, 52) having dual amplifying means separately operable on inputs of opposite polarity connected to the output of said d.c. amplifier (10), and b. an indicator circuit (59, 60) connected to said voltage comparator, whereby an indication is obtained upon an output from said d.c. amplifier in excess of a selectable threshold.
References Cited (Backward Citations)
GB620140A
Cited
US3081435A
Cited
US2988702A
Cited
US3436675A
Cited
US3495179A
Cited
US3509460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |