US3729666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dc command smoothing circuit
Assignee: Cogar Corp
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Filing: 1971-01-08
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Granted: 1973-04-24
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Expires: 1991-01-08
Abstract
Abstract A DC command smoothing circuit which converts step inputs to smoothed command outputs. Although different polarity and magnitude outputs can be generated, only a single operational amplifier is required to produce all of the necessary transition functions. The operational amplifier includes a capacitor in parallel with a fixed resistor and at least one pair of series connected resistors. The junction of the series resistors can be selectively shorted to ground to change the gain of the amplifier.
Inventors
- 👤 W Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:53
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/72; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; H03G; H03G1/00; H03G1/02; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1291
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
90 words
A smoothing circuit comprising an operational amplifier having at least one inPut terminal and an output terminal, means for applying a step input to said at least one input terminal, capacitor means connected in a feedback configuration with said operational amplifier, and variable resistance means connected in parallel with said capacitor means, said variable resistance means includes at least one resistance means connected getween input and output terminals of said operational amplifier, and switch means operative to effectively prevent said at least one resistance means from performing a feedback function.
Claim 2
Dependent Claim
90 words
A smoothing circuit comprising an operational amplifier having at least one inPut terminal and an output terminal, means for applying a step input to said at least one input terminal, capacitor means connected in a feedback configuration with said operational amplifier, and variable resistance means connected in parallel with said capacitor means, said variable resistance means includes at least one resistance means connected getween input and output terminals of said operational amplifier, and switch means operative to effectively prevent said at least one resistance means from performing a feedback function.
Claim 3
Dependent Claim
28 words
A smoothing circuit in accordance with claim 1 wherein said variable resistance means further includes a resistor of predetermined magnitude permanently connected between said input and output terminals.
Claim 4
Dependent Claim
29 words
A smoothing circuit in accordance with claim 2 wherein said step input applying means selectively applies a step function of either polarity to said at least one input terminal.
Claim 5
Dependent Claim
38 words
A smoothing circuit in accordance with claim 2 wherein said at least one resistance means includes a pair of series-connected resistors, said switch means being operative to selectively short the junction of said pair of resistors to ground.
Claim 6
Dependent Claim
29 words
A smoothing circuit in accordance with claim 4 wherein said step input applying means selectively applies a step function of either polarity to said at least one input terminal.
Claim 7
Dependent Claim
55 words
A smoothing ciruit in accordance with claim 2 wherein said operational amplifier has two input terminals, and said step input applying means includes a source of potential and gating means for selectively coupling said source of potential to a selected one of said input terminals and coupling the other of said input terminals to ground.
Claim 8
Dependent Claim
36 words
A smoothing circuit in accordance with claim 6 wherein said gating means is further operative to selectively couple both of said input terminals to ground to cause a ground potential to appear at said output terminal.
Claim 9
Dependent Claim
38 words
A smoothing circuit in accordance with claim 1 wherein said at least one resistance means includes a pair of series-connected resistors, said switch means being operative to selectively short the junction of said pair of resistors to ground.
Claim 10
Dependent Claim
29 words
A smoothing circuit in accordance with claim 1 wherein said step input applying means selectively applies a step function of either polarity to said at least one input terminal.
Claim 11
Dependent Claim
56 words
A smoothing circuit in accordance with claim 1 wherein said step input applying means includes two output terminals having opposite polarity potentials thereon and gating means for selectively coupling a selected one of said output terminals to said at least one input terminal to determine the polarity of the signal at said operational amplifier output terminal.
Claim 12
Dependent Claim
47 words
A smoothing circuit in accordance with claim 10 wherein said gating means is further operative to selectively couple both of said step input applying means output terminals to said at least one input terminal to cause a ground potential to appear at said operational amplifier output terminal.
Claim 13
Dependent Claim
88 words
A signal forming circuit comprising an amplifier having at least one input terminal and an output terminal, means for applying a command signal to said at least one input terminal, capacitor means connected in a feedback configuration with said amplifier, and variable resistance means connected in parallel with said capacitor means, said variable resistance means includes at least one resistance means connected between input and output terminals of said amplifier, and switch means operative to effectively prevent said at least one resistance means from performing a feedback function.
Claim 14
Dependent Claim
88 words
A signal forming circuit comprising an amplifier having at least one input terminal and an output terminal, means for applying a command signal to said at least one input terminal, capacitor means connected in a feedback configuration with said amplifier, and variable resistance means connected in parallel with said capacitor means, said variable resistance means includes at least one resistance means connected between input and output terminals of said amplifier, and switch means operative to effectively prevent said at least one resistance means from performing a feedback function.
Claim 15
Dependent Claim
29 words
A signal forming circuit in accordance with claim 12 wherein said variable resistance means further includes a resistor of predetermined magnitude permanently connected between said input and output terminals.
Claim 16
Dependent Claim
39 words
A signal forming circuit in accordance with claim 12 wherein said at least one resistance means includes a pair of series-connected resistors, said switch means being operative to selectively shOrt the junction of said pair of resistors to ground.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |