US4550295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switched capacitor integrator
Assignee: Toshiba Corp
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Filing: 1984-09-05
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Granted: 1985-10-29
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Expires: 2004-09-05
Abstract
Abstract A switched capacitor integrator is comprised of an operational amplifier, a feedback capacitor connected between the inverting input terminal and the output terminal of the amplifier, a bias circuit for applying a given voltage to the non-inverting input terminal of the amplifier, a switched capacitor, and a switch circuit which connects the switched capacitor between the signal input terminal applied with an input voltage signal and the inverting input terminal of the amplifier in a first operation mode and short-circuits the switched capacitor in a second operation mode.
Inventors
- 👤 Itsuo Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:29
CPC Classifications
H; H03; H03H; H03H19/00; H03H19/004; G; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186; G06G7/1865
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
180 words
A switched capacitor integrator comprising: only first and second power sources; only first and second power source terminals connected to said first and second power sources, respectively; operational amplifier means driven by said first and second power sources and having an inverting input terminal, a non-inverting input terminal, and an output terminal; feedback capacitor means connected between said inverting input terminal and said output terminal of said operational amplifier means; bias circuit means connected between said first and second power source terminals and driven by said first and second power sources for providing a given bias voltage to said non-inverting input terminal of said operational amplifier means; switched capacitor means separated from the non-inverting input terminal of said operational amplifier means; and switching means for connecting said switched capacitor means between a signal input terminal applied with an input voltage signal and said inverting input terminal of said operational amplifier means in a first operation mode and connecting both ends of said switched capacitor means to one of said first and second power source terminals in a second operation mode.
Claim 2
Dependent Claim
180 words
A switched capacitor integrator comprising: only first and second power sources; only first and second power source terminals connected to said first and second power sources, respectively; operational amplifier means driven by said first and second power sources and having an inverting input terminal, a non-inverting input terminal, and an output terminal; feedback capacitor means connected between said inverting input terminal and said output terminal of said operational amplifier means; bias circuit means connected between said first and second power source terminals and driven by said first and second power sources for providing a given bias voltage to said non-inverting input terminal of said operational amplifier means; switched capacitor means separated from the non-inverting input terminal of said operational amplifier means; and switching means for connecting said switched capacitor means between a signal input terminal applied with an input voltage signal and said inverting input terminal of said operational amplifier means in a first operation mode and connecting both ends of said switched capacitor means to one of said first and second power source terminals in a second operation mode.
Claim 3
Dependent Claim
62 words
A switched capacitor integrator according to claim 1, in which said bias circuit means includes first and second transistors connected in series between said first and second power source terminals, and a junction between said first and second transistors connected to said non-inverting input terminal of said amplifier means so as to apply said given bias voltage to the non-inverting input terminal.
Claim 4
Dependent Claim
150 words
A switched capacitor integrator according to claim 1, in which said switching means includes a first transistor switch connected between said signal input terminal and one end of said switched capacitor means and turned on or off by a first clock pulse, a second transistor switch connected between said one end of said switched capacitor means and said first power source terminal and turned on or off by a second clock pulse of which the pulse period does not overlap with that of the first clock pulse, a third transistor switch connected between the other end of said switched capacitor means and said inverting input terminal of said amplifier means and turned on or off by said first clock pulse, and a fourth transistor connected between said other end of said switched capacitor means and said first power source terminal and turned on or off by said second clock pulse.
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |