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Patent US3586880A successfully refreshed from Google Patents.
US3586880A
Expired / Lapsed
US
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Isolation and compensation of sample and hold circuits
Assignee: ASTRODATA Inc
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Filing: 1969-08-11
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Granted: 1971-06-22
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Expires: 1989-08-11
Abstract
Abstract The invention concerns a sample and hold circuit including charge storage capacitors and switches connected between input and output amplifiers and operable to provide substantially improved isolation of a hold capacitor from the input amplifier, as during the hold period, and also to provide compensation for the transient jump in voltage developed at the hold capacitor during switching.
Inventors
- 👤 William Fitzwater Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:08
CPC Classifications
G; G11; G11C; G11C27/00; G11C27/02; G11C27/024; G11C27/026
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
123 words
In a sample and hold circuit, the combination comprising a. input and output amplifiers, b. first and second charge storage devices, each having opposite terminals, c. a first switch connected in series between the output side of the input amplifier and one terminal of the first storage device, and d. a second switch connected in series between said one terminal of the first storage device and one terminal of the second storage device which is also connected with the input of the output amplifier, e. whereby said devices may be charged by the input amplifier while the switches are closed, and said second switch may be effectively isolated from the input amplifier during opening of said second switch while the first remains closed.
Claim 2
Dependent Claim
123 words
In a sample and hold circuit, the combination comprising a. input and output amplifiers, b. first and second charge storage devices, each having opposite terminals, c. a first switch connected in series between the output side of the input amplifier and one terminal of the first storage device, and d. a second switch connected in series between said one terminal of the first storage device and one terminal of the second storage device which is also connected with the input of the output amplifier, e. whereby said devices may be charged by the input amplifier while the switches are closed, and said second switch may be effectively isolated from the input amplifier during opening of said second switch while the first remains closed.
Claim 3
Dependent Claim
10 words
The combination of claim 1 wherein said devices comprise capacitors.
Claim 4
Dependent Claim
24 words
The combination of claim 1 including means operatively connected with said switches to open the second switch just prior to opening the first switch.
Claim 5
Dependent Claim
32 words
The combination of claim 3 wherein said switches comprise gate controlled elements and said means comprises voltage sources and auxiliary switches operable to connect said sources with the gates of said elements.
Claim 6
Dependent Claim
61 words
The combination of claim 4 wherein the second amplifier is a differential amplifier having a first input terminal to which said second storage device is connected, and a second input terminal, one of said voltage sources being connectable by one of said auxiliary switches between the gate of said second switch element and the second input terminal of said second amplifier.
Claim 7
Dependent Claim
12 words
The combination of claim 4 wherein said switches comprise field effect transistors.
Claim 8
Dependent Claim
47 words
The combination of claim 1 including means connected with said one terminal of the second storage device for supplying charge to the second storage device sufficient to compensate for the change in charge developing at the second storage device in response to opening of said second switch.
Claim 9
Dependent Claim
52 words
The combination of claim 7 wherein said last-named means comprises an auxiliary voltage source, an auxiliary switch, and an auxiliary capacitor disconnectable by said auxiliary switch from series connection between said auxiliary voltage source and said one terminal of the second storage device in timed relation to opening of said second switch.
Claim 10
Dependent Claim
51 words
The combination of claim 1 including control means for said switches wherein the control of the second switch is referenced to the voltage across the second storage device and characterized in that charge transfer to the second storage device is minimized and constant in response to opening of the second switch.
Claim 11
Dependent Claim
90 words
In a sample and hold circuit, the combination comprising a. input and output amplifiers, b. a charge storage device, c. a principle switch connected in series between the output side of the input amplifier and one terminal of the storage device which is also connected with the input of the output amplifier, and d. means connected with said one terminal of the storage device for supplying charge to that device sufficient to compensate for the change in charge developing at the storage device in response to opening of said switch.
Claim 12
Dependent Claim
90 words
In a sample and hold circuit, the combination comprising a. input and output amplifiers, b. a charge storage device, c. a principle switch connected in series between the output side of the input amplifier and one terminal of the storage device which is also connected with the input of the output amplifier, and d. means connected with said one terminal of the storage device for supplying charge to that device sufficient to compensate for the change in charge developing at the storage device in response to opening of said switch.
Claim 13
Dependent Claim
50 words
The combination of claim 10 wherein said means includes an auxiliary voltage source, an auxiliary switch, and an auxiliary capacitor disconnected by said auxiliary switch from series connection between said auxiliary voltage source and said one terminal of the storage device in timed relation to opening of the principle switch.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |