US4521743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switched capacitor amplifier
Assignee: Pacesetter Inc
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Filing: 1983-12-29
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Granted: 1985-06-04
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Expires: 2003-12-29
Abstract
Abstract A switched capacitor amplifier includes an operational amplifier with an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal. Current generating means responsive to a pulse train is utilized to provide the high bias current only at the beginning of each pulse cycle to the bias current input terminal of the operational amplifier.
Inventors
- 👤 Malcolm L. Heimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:29
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/005
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
A switched capacitor amplifier comprising: an operational amplifier having an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal; a capacitor coupled to said inverting input terminal of said operational amplifier; timing means coupled to said operational amplifier for providing a plurality of timing cycles; current generating means responsive to said timing means for providing a high bias current only at the beginning of each timing cycle to the bias input terminal of said operational amplifier.
Claim 2
Dependent Claim
83 words
A switched capacitor amplifier comprising: an operational amplifier having an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal; a capacitor coupled to said inverting input terminal of said operational amplifier; timing means coupled to said operational amplifier for providing a plurality of timing cycles; current generating means responsive to said timing means for providing a high bias current only at the beginning of each timing cycle to the bias input terminal of said operational amplifier.
Claim 3
Dependent Claim
101 words
A switched capacitor amplifier comprising: an operational amplifier having an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal; a first capacitor coupled to said inverting input terminal of said operational amplifier; a second capacitor coupled between the inverting input terminal and the output terminal of said operational amplifier; timing means coupled to said second capacitor for providing a plurality of timing cycles; current generating means responsive to said timing means for providing a high bias current only at the beginning of each timing cycle to the bias input terminal of said operational amplifier.
Claim 4
Dependent Claim
101 words
A switched capacitor amplifier comprising: an operational amplifier having an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal; a first capacitor coupled to said inverting input terminal of said operational amplifier; a second capacitor coupled between the inverting input terminal and the output terminal of said operational amplifier; timing means coupled to said second capacitor for providing a plurality of timing cycles; current generating means responsive to said timing means for providing a high bias current only at the beginning of each timing cycle to the bias input terminal of said operational amplifier.
Claim 5
Dependent Claim
21 words
A switched capacitor amplifier as claimed in claim 2, wherein said timing means comprises a transmission gate and a J-K flip-flop.
Claim 6
Dependent Claim
27 words
A switched capacitor amplifier as claimed in claim 3, wherein the Q output of said J-K flip-flop is coupled to the input terminal of said transmission gate.
Claim 7
Dependent Claim
23 words
A switched capacitor amplifier as claimed in claim 2, wherein said current generating means comprises a third capacitor, a diode, and a resistor.
Claim 8
Dependent Claim
32 words
A switched capacitor amplifier as claimed in claim 5, wherein a second resistor is connected to a positive supply voltage for supplying a constant low level bias current to said operational amplifier.
Claim 9
Dependent Claim
113 words
A switched capacitor amplifier comprising: an operational amplifier having an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal; a first capacitor having one end connected to said inverting input terminal of said operational amplifier; switching input means connected to the other end of said first capacitor; a second capacitor coupled between the inverting input terminal and the output terminal of said operational amplifier; clock pulse means coupled in parallel to said second capacitor; current generating means responsive to said clock pulse means for providing a high bias current only at the beginning of each pulse cycle to the bias input terminal of said operational amplifier.
Claim 10
Dependent Claim
113 words
A switched capacitor amplifier comprising: an operational amplifier having an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal; a first capacitor having one end connected to said inverting input terminal of said operational amplifier; switching input means connected to the other end of said first capacitor; a second capacitor coupled between the inverting input terminal and the output terminal of said operational amplifier; clock pulse means coupled in parallel to said second capacitor; current generating means responsive to said clock pulse means for providing a high bias current only at the beginning of each pulse cycle to the bias input terminal of said operational amplifier.
Claim 11
Dependent Claim
22 words
A switched capacitor amplifier as claimed in claim 7, wherein said clock pulse means comprises a transmission gate and a J-K flip-flop.
Claim 12
Dependent Claim
27 words
A switched capacitor amplifier as claimed in claim 8, wherein the Q output of said J-K flip-flip is coupled to the input terminal of said transmission gate.
Claim 13
Dependent Claim
23 words
A switched capacitor amplifier as claimed in claim 7, wherein said current generating means comprises a third capacitor, a diode, and a resistor.
Claim 14
Dependent Claim
34 words
A switched capacitor amplifier as claimed in claim 7, wherein said switching input means comprises a double-pole - double-throw switch for switching an input voltage input terminal between a positive supply voltage and ground.
Claim 15
Dependent Claim
32 words
A switched capacitor amplifier as claimed in claim 10, wherein a second resistor is connected to a positive supply voltage for supplying a constant low level bias current to said operational amplifier.
Claim 16
Dependent Claim
25 words
A switched capacitor amplifier as claimed in claim 7, wherein said operational amplifier is formed by a pair of complementary coupled P-channel and N-channel MOSFETS.
References Cited (Backward Citations)
US4329599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |