Patent US6288669B1 successfully refreshed from Google Patents.
US6288669B1
Expired / Lapsed
US
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Switched capacitor programmable gain and attenuation amplifier circuit
Assignee: Individual
•
Filing: 1999-07-15
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Granted: 2001-09-11
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Expires: 2019-07-15
Abstract
Abstract A digitally programmable switched capacitor gain and attenuation circuit that uses the same switched capacitor array for a multitude of different gain and/or attenuation settings with a single operational amplifier is disclosed. With the top plates of the capacitors connected to the operational amplifier input, the unique switching of the bottom plates of the capacitor array elements between three voltages—the circuit output, the circuit input, or a chosen reference voltage such as a power supply midpoint voltage or a ground voltage of the circuit, makes this circuit arrangement's component area smaller and the operational amplifier's design specification less demanding for applications such as a digital camera front end analog processor.
Inventors
- 👤 Daramana G. Gata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:11
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/06; H03M1/0617; H03M1/0675; H03M1/0678; H03M1/068; H03M1/0682; G; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186; G06G7/1865; H03G; H03G1/00; H03G1/0005; H03G1/0088; H03G1/0094; H03M1/66; H03M1/74; H03M1/80; H03M1/802; H03M1/804
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A programmable switched capacitor gain and attenuation circuit comprising: an operational amplifier; N capacitors, each of the N capacitors having a top plate coupled to a first input of the operational amplifier, wherein N is an integer greater than one; N switching networks, each of the N switching networks is coupled to a corresponding bottom plate of a corresponding one of the N capacitors, each of the N switching networks is operable to switch the corresponding bottom plate to any one of a first input node, a first output of the operational amplifier, and a common node; and M capacitors each having a top plate coupled to a second input of the operational amplifier, wherein M is equal to N.
Claim 2
Dependent Claim
120 words
A programmable switched capacitor gain and attenuation circuit comprising: an operational amplifier; N capacitors, each of the N capacitors having a top plate coupled to a first input of the operational amplifier, wherein N is an integer greater than one; N switching networks, each of the N switching networks is coupled to a corresponding bottom plate of a corresponding one of the N capacitors, each of the N switching networks is operable to switch the corresponding bottom plate to any one of a first input node, a first output of the operational amplifier, and a common node; and M capacitors each having a top plate coupled to a second input of the operational amplifier, wherein M is equal to N.
Claim 3
Dependent Claim
22 words
The circuit of claim 1 further comprising a switch coupled between the first input of the operational amplifier and the common node.
Claim 4
Dependent Claim
19 words
The circuit of claim 2 further comprising a second input of the operational amplifier coupled to the common node.
Claim 5
Dependent Claim
19 words
The circuit of claim 1 further comprising a second input of the operational amplifier coupled to the common node.
Claim 6
Dependent Claim
29 words
The circuit of claim 4 wherein the first input of the operational amplifier is a negative input and the second input of the operational amplifier is a positive input.
Claim 7
Dependent Claim
64 words
The circuit of claim 1 further comprising M switching networks, each of the M switching networks is coupled to a corresponding bottom plate of a corresponding one of the M capacitors, each of the M switching networks is operable to switch the corresponding bottom plate to any one of a second input node, a second output of the operational amplifier, and the common node.
Claim 8
Dependent Claim
24 words
The circuit of claim 6 further comprising a switch coupled between the common node and the first and second input of the operational amplifier.
Claim 9
Dependent Claim
51 words
The circuit of claim 6 wherein the first input of the operational amplifier is a negative input, the second input of the operational amplifier is a positive input, the first output of the operational amplifier is a negative output, and the second output of the operational amplifier is a positive output.
Claim 10
Dependent Claim
24 words
The circuit of claim 1 further comprising a switch coupled between the common node and the first and second input of the operational amplifier.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-09-10 | 2005-03-12 | 2005-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-09-10 | 2009-03-12 | 2009-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-09-10 | 2013-03-12 | 2013-09-11 | $7700.00 | Window Closed / Lapsed |