Patent US4151478A successfully refreshed from Google Patents.
US4151478A
Expired / Lapsed
US
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Nonlinearly variable gain apparatus
Assignee: United States Department of the Air Force
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Filing: 1978-01-03
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Granted: 1979-04-24
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Expires: 1998-01-03
Abstract
Abstract A nonlinearly variable gain circuit is utilized to produce an inverted logarithmic S curve of gain versus potentiometer rotation while using a linear resistance taper potentiometer. An operational amplifier feedback circuit uses the linear potentiometer and a resistance network in combination.
Inventors
- 👤 Eric C. Heinrich
- 👤 William H. Mosley, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:48
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/02; H03G3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A nonlinearly variable gain circuit comprising an operational amplifier having a positive and a negative input and a single output, said positive input receiving an input voltage, a preselected first resistor connected from said positive input to ground, second and third preselected resistors in series connected from said single output to ground, a fourth preselected resistor connected between said second and third resistor to said negative input to provide a feedback path for said operational amplifier, a fifth preselected resistor connected from said negative input to ground, a linear resistor taper potentiometer having a taper arm, the total resistance thereof being connected from the output of said operational amplifier to ground, and a sixth preselected resistor connected from between said second and third resistor to said taper arm so that the circuit produces an inverted logarithmic S curve of gain versus potentiometer rotation while using a linear resistance taper potentiometer.
Claim 2
Dependent Claim
150 words
A nonlinearly variable gain circuit comprising an operational amplifier having a positive and a negative input and a single output, said positive input receiving an input voltage, a preselected first resistor connected from said positive input to ground, second and third preselected resistors in series connected from said single output to ground, a fourth preselected resistor connected between said second and third resistor to said negative input to provide a feedback path for said operational amplifier, a fifth preselected resistor connected from said negative input to ground, a linear resistor taper potentiometer having a taper arm, the total resistance thereof being connected from the output of said operational amplifier to ground, and a sixth preselected resistor connected from between said second and third resistor to said taper arm so that the circuit produces an inverted logarithmic S curve of gain versus potentiometer rotation while using a linear resistance taper potentiometer.
References Cited (Backward Citations)
US3448289A
Cited
US3506847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |