US4296381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distortion reduction circuit for an inverting feedback amplifier
Assignee: Micron Technology Inc
•
Filing: 1979-10-01
•
Granted: 1981-10-20
•
Expires: 1999-10-01
Abstract
Abstract An amplifier is connected between the inverting and non-inverting inputs of an inverting feedback amplifier to substantially reduce distortion caused by inherent physical properties of the semiconductor devices.
Inventors
- 👤 Bruce E. Hofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:42
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3223; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
An amplifier circuit, comprising: an inverting feedback amplifier having inverting and non-inverting inputs and an output, an input impedance element connected to said inverting input, and a feedback impedance element connected from said output to said inverting input; and a distortion reduction amplifier comprising a field-effect transistor, the gate of which is directly connected to said inverting input of said feedback amplifier, and the drain of which is coupled to said non-inverting input of said feedback amplifier.
Claim 2
Dependent Claim
77 words
An amplifier circuit, comprising: an inverting feedback amplifier having inverting and non-inverting inputs and an output, an input impedance element connected to said inverting input, and a feedback impedance element connected from said output to said inverting input; and a distortion reduction amplifier comprising a field-effect transistor, the gate of which is directly connected to said inverting input of said feedback amplifier, and the drain of which is coupled to said non-inverting input of said feedback amplifier.
Claim 3
Dependent Claim
19 words
An amplifier in accordance with claim 1 wherein the source of said field-effect transistor is connected to ground. PG,8
Claim 4
Dependent Claim
22 words
An amplifier in accordance with claim 1 wherein said distortion reduction amplifier further comprises passive elements to limit the frequency response thereof.
References Cited (Backward Citations)
US2730573A
Cited
US3462697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |