US4524327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operational amplifier
Assignee: Toshiba Corp
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Filing: 1982-07-02
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Granted: 1985-06-18
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Expires: 2002-07-02
Abstract
Abstract An operational amplifier which comprises a first amplifying circuit; a second amplifying circuit which is connected to the first amplifying circuit and carries out inverting amplification; a third amplifying circuit which is connected to the second amplifying circuit, carries out noninverting amplification and has a gain of substantially 1; a first feedback circuit which is connected between the output and input terminals of the second amplifying circuit and carries out phase-compensation; and a second feedback circuit which is connected between the output terminal of the third amplifying circuit and the input terminal of the second amplifying circuit, and carries out phase-compensation.
Inventors
- 👤 Eiji Masuda
- 👤 Kenji Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:54
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03F1/083; H03F1/086
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
An operational amplifier which comprises: first amplifying means; second amplifying means connected to the output of the first amplifying means and carrying out inverting amplification; third amplifying means connected to the output of the second amplifying means and carrying out noninverting amplification with a gain of substantially 1, said third amplifying means including a source follower circuit and being formed of a noninverting amplifier whose output impedance is lower than its input impedance; said first, second and third amplifying means each comprising at least one MOS transistor; first feedback means connected directly between the output and input of the second amplifying means and carrying out a phase-compensating function; and second feedback means connected between the output of the third amplifying means and the input of the second amplifying means and carrying out a phase compensating function.
Claim 2
Dependent Claim
136 words
An operational amplifier which comprises: first amplifying means; second amplifying means connected to the output of the first amplifying means and carrying out inverting amplification; third amplifying means connected to the output of the second amplifying means and carrying out noninverting amplification with a gain of substantially 1, said third amplifying means including a source follower circuit and being formed of a noninverting amplifier whose output impedance is lower than its input impedance; said first, second and third amplifying means each comprising at least one MOS transistor; first feedback means connected directly between the output and input of the second amplifying means and carrying out a phase-compensating function; and second feedback means connected between the output of the third amplifying means and the input of the second amplifying means and carrying out a phase compensating function.
Claim 3
Dependent Claim
22 words
The operational amplifier according to claim 1, wherein the first and second feedback means are each formed of a phase-compensating capacitive element.
Claim 4
Dependent Claim
27 words
The operational amplifier according to claim 2, wherein a resistive element is connected in series to the phase-compensating capacitive elements of the first and second feedback means.
Claim 5
Dependent Claim
34 words
The operational amplifier according to claim 2, wherein a noninverting amplifier having a gain of substantially 1 is connected to the inputs of the phase-compensating capacitive elements of the first and second feedback means.
Claim 6
Dependent Claim
24 words
The operational amplifier according to claim 4, wherein a resistive element is connected between the inputs of the capacitive element and the noninverting amplifier.
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) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |