US4079337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide bandwidth feedback amplifier
Assignee: VCS Inc
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Filing: 1976-10-29
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Granted: 1978-03-14
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Expires: 1996-10-29
Abstract
Abstract A wide bandwidth characteristic is provided for use as in a negative feedback amplifier by a deposited resistor arrangement. The arrangement includes a basic feedback resistor having a high resistance value and a narrow elongated shape. Closely positioned on the same substrate and physically parallel are one or more low value resistors having the same length and with adjacent points on the respective resistors being at the same electrical potential. The feedback capacitance is greatly reduced by the extra length. The capacity to ground, and thus the displacement current, is essentially eliminated since most of the stray capacitance is between points of equal potential.
Inventors
- 👤 Kenneth Paul Lundgren
- 👤 Edward John Freeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:43
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/486; H03F1/34
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
174 words
An improved feedback resistor arrangement for providing a wide band characteristic in a negative feedback amplifier having input and output terminals and a reference terminal having thereon a signal substantially equal to that on the input terminal, said feedback resistor arrangement including in combination: a substrate; first elongated resistor means deposited on the substrate, having first and second ends coupled to the output and input terminals respectively and having a first resistance value; second resistor means deposited on the substrate physically parallel to and closely adjacent the first resistor means, having a second resistance value substantially less than the first resistance value, having substantially the same length as the first resistor means, having a first end adjacent and coupled to the first end of the first resistor means and a second end adjacent the second end of the first resistor means, and coupled to the reference terminal, and wherein the immediately adjacent incremental lengths of the first resistor means and the second resistor means comprise substantially equal percentages of the respective total resistances thereof.
Claim 2
Dependent Claim
174 words
An improved feedback resistor arrangement for providing a wide band characteristic in a negative feedback amplifier having input and output terminals and a reference terminal having thereon a signal substantially equal to that on the input terminal, said feedback resistor arrangement including in combination: a substrate; first elongated resistor means deposited on the substrate, having first and second ends coupled to the output and input terminals respectively and having a first resistance value; second resistor means deposited on the substrate physically parallel to and closely adjacent the first resistor means, having a second resistance value substantially less than the first resistance value, having substantially the same length as the first resistor means, having a first end adjacent and coupled to the first end of the first resistor means and a second end adjacent the second end of the first resistor means, and coupled to the reference terminal, and wherein the immediately adjacent incremental lengths of the first resistor means and the second resistor means comprise substantially equal percentages of the respective total resistances thereof.
Claim 3
Dependent Claim
17 words
A feedback resistor arrangement according to claim 1 wherein the resistor means are deposited thick film resistors.
Claim 4
Dependent Claim
42 words
A feedback resistor arrangement according to claim 1 wherein the first resistor means is deposited on a first surface of the substrate and a second resistor means is deposited on a second surface of the substrate, immediately opposite the first resistor means.
Claim 5
Dependent Claim
45 words
A feedback resistor arrangement according to claim 1 wherein the first resistor means is deposited on a first surface of the substrate and the second resistor means comprises a resistor on either side of the first resistor means on the same surface of the substrate.
Claim 6
Dependent Claim
32 words
A feedback resistor arrangement according to claim 4 and wherein the second resistor means further includes another resistor deposited on a second surface of the substrate immediately opposite the first resistor means.
Claim 7
Independent Claim
170 words
A method of forming a deposited resistor arrangement capable of providing wide bandwidth feedback for an amplifier, comprising the steps of: forming on a substrate a high value deposited resistor; forming at least one low value deposited resistor on said substrate, closely adjacent and physically parallel to said high value resistor and having substantially the same length as the high value resistor, each incremental length of the low value resistor having the same percentage of the total resistance thereof as does the immediately adjacent incremental length of the high value resistor of the total resistance thereof; coupling a first end of said high value resistor to the amplifier output; coupling a second end of said high value resistor to the amplifier input; coupling to the first end of said high value resistor the adjacent end of the low value resistor; and coupling the end of said low value resistor adjacent the second end of said high value resistor to a potential substantially equal to the potential on the amplifier input.
Claim 8
Independent Claim
170 words
A method of forming a deposited resistor arrangement capable of providing wide bandwidth feedback for an amplifier, comprising the steps of: forming on a substrate a high value deposited resistor; forming at least one low value deposited resistor on said substrate, closely adjacent and physically parallel to said high value resistor and having substantially the same length as the high value resistor, each incremental length of the low value resistor having the same percentage of the total resistance thereof as does the immediately adjacent incremental length of the high value resistor of the total resistance thereof; coupling a first end of said high value resistor to the amplifier output; coupling a second end of said high value resistor to the amplifier input; coupling to the first end of said high value resistor the adjacent end of the low value resistor; and coupling the end of said low value resistor adjacent the second end of said high value resistor to a potential substantially equal to the potential on the amplifier input.
Claim 9
Dependent Claim
17 words
A method in accordance with claim 6 in which the resistors are formed by thick film deposition.
Claim 10
Dependent Claim
32 words
A method in accordance with claim 6 in which the high value resistor has a first dimension in the plane of the substrate substantially greater than a second dimension in said plane.
Claim 11
Dependent Claim
42 words
A method in accordance with claim 6 in which the high value resistor is formed on a first surface of the substrate and the low value resistor is formed on a second surface of the substrate, immediately opposite the high value resistor.
Claim 12
Dependent Claim
39 words
A method in accordance with claim 6 in which a low value resistor is formed on each side of the high value resistor on a first surface of the substrate and the low value resistors are connected in parallel.
Claim 13
Dependent Claim
35 words
A method in accordance with claim 10 and including the formation of a low value resistor on a second surface of the substrate, connected in parallel with the low value resistors on the first surface.
Claim 14
Dependent Claim
128 words
A wide bandwidth resistor arrangement comprising: a substrate; first elongated resistor means, deposited on a first surface of the substrate, having a predetermined length, and having a first resistance value; and second resistor means deposited on the substrate, having a length substantially equal to the predetermined length, physically parallel to and closely adjacent the first resistor means, having a first end coupled to the adjacent end of the first resistor means, having a second end free of the adjacent end of the first resistor means, having a second resistance value substantially greater than the first resistance value, and having a resistance gradient along each increment of length which is a predetermined multiple of the resistance gradient along each immediately adjacent increment of length of the first resistor means.
Claim 15
Dependent Claim
128 words
A wide bandwidth resistor arrangement comprising: a substrate; first elongated resistor means, deposited on a first surface of the substrate, having a predetermined length, and having a first resistance value; and second resistor means deposited on the substrate, having a length substantially equal to the predetermined length, physically parallel to and closely adjacent the first resistor means, having a first end coupled to the adjacent end of the first resistor means, having a second end free of the adjacent end of the first resistor means, having a second resistance value substantially greater than the first resistance value, and having a resistance gradient along each increment of length which is a predetermined multiple of the resistance gradient along each immediately adjacent increment of length of the first resistor means.
Claim 16
Dependent Claim
33 words
A wide bandwidth resistor arrangement according to claim 12 wherein the first resistor means comprises a resistor portion on either side of the second resistor means on the first surface of the substrate.
Claim 17
Dependent Claim
31 words
A wide bandwidth resistor arrangement according to claim 12 wherein the first resistor means comprises a resistor on a second surface of the substrate and immediately opposite the second resistor means.
Claim 18
Dependent Claim
51 words
A wide bandwidth resistor arrangement according to claim 12 wherein the first resistor means comprises a resistor portion on either side of the second resistor means on the first surface of the substrate and a resistor portion on a second surface of the substrate and immediately opposite the second resistor means.
Claim 19
Dependent Claim
20 words
A wide bandwidth resistor arrangement according to claim 12 wherein the first and second resistor means comprise thick film resistors.
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) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |