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 Title: |
US5486791:
Programmable gain amplifier
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Spitalny, Paul; Allston, MA
Mallinson, Martin; Billerica, MA
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| Assignee: |
Analog Devices, Inc., Norwood, MA
other patents from ANALOG DEVICES, INC. (28725) (approx. 876)
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| Published / Filed: |
1996-01-23
/ 1993-01-29
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| Application Number: |
US1993000011106
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| IPC Code: |
Advanced:
H03G 1/00;
H03G 3/00;
Core:
more...
IPC-7:
H03G 3/30;
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| ECLA Code: |
H03G3/00D; H03G1/00B8;
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| U.S. Class: |
Current:
330/282;
330/084;
330/145;
330/284;
Original:
330/282;
330/084;
330/145;
330/284;
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| Field of Search: |
330/282,284,84,86,144,45
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| Priority Number: |
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| Abstract: |
A programmable gain amplifier including first and second gain elements are connected by an impedance selector which allows programmability of the gain of both gain elements. The impedance selector is connected in series with the output of the first gain element. The impedance selector places an impedance in the feedback path of the first gain element or the input path of the second gain element. Errors introduced in the signal path due to the switches are attenuated by the open loop gain of the first gain element. The gain may be equally divided between both stages of the amplifier to allow for optimum band width. Optimum noise performance may be obtained by placing most of the gain in the first stage. An instrumentation amplifier may also be made which further includes a third gain element connected to the gain element with a second impedance selector in a manner similar to the connection of the first gain element to the second gain element.
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| Attorney, Agent or Firm: |
Wolf, Greenfield & Sacks ;
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| Primary / Asst. Examiners: |
Mullins, James B.;
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| INPADOC Legal Status: |
None
Family Legal Status Report
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| Foreign References: |
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| Other Abstract Info: |
DERABS G93-243486
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| Other References: |
Analog Devices Product Data Sheet for AD75062 and AD75068, Rev. 0 (Norwood, Mass.: Analog Devices, 1991).
Analog Devices, "Linear Databook", pp. 4-7, 4-11, 4-37, 4-43. (Norwood, Mass.: Analog Devices, 1990/1991).
M. J. Hynes et al., "A CMOS Digitally Controlled Audio Attenuator for Hi-Fi Systems", IEEE Journal of Solid-State Circuits, vol. SC-16, Feb. 1981, No. 1, New York, pp. 15-20.
A. Kaniel, "Flexible PGA designs require few components", EDN Electrical Design News, vol. 32, No. 2, 22 Jan. 1987, Newton, Mass., US, pp. 181-187.
(7 pages)
Cited by 4 patents
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