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 Title: |
US5233309:
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: |
1993-08-03
/ 1992-01-09
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| Application Number: |
US1992000819376
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| IPC Code: |
Advanced:
H03G 1/00;
H03G 3/00;
Core:
more...
IPC-7:
H03F 3/68;
H03G 3/00;
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| U.S. Class: |
Current:
330/084;
330/086;
330/144;
330/282;
330/284;
Original:
330/084;
330/086;
330/144;
330/282;
330/284;
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| Field of Search: |
330/084,86,144,145,282,284
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| Priority Number: |
| 1992-01-09 |
US1992000819376 |
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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: |
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Family Legal Status Report
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| Designated Country: |
EP JP
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| Family: |
Show 9 known family members
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First Claim:
Show all 14 claims |
What is claimed is:
1. A programmable gain amplifier comprising:
- a first gain element having means for receiving an input, means for providing an output, and means for receiving a feedback signal;
- a second gain element having means for receiving an input and means for providing an output;
- an impedance having a first lead connected to the feedback signal receiving means and a second lead connected to the input receiving means of the second gain element;
- a switch connected to the output of the first gain element having a first state for connecting the output of the first gain element to the first lead of the impedance and having a second state for connecting the output of the first gain element to the second lead of the impedance;
- said first gain element being capable of receiving a continuous AC input signal as its input;
- said second gain element providing, as its output, a continuous AC signal which is a function of the input signal, and wherein the second gain element has means for receiving a second input,
- a third gain element having means for receiving an input, means for providing an output, and means for receiving a feedback signal;
- a second impedance having a first lead connected to the feedback signal receiving means of the third gain element and a second lead connected to the second input receiving means of the second gain element; and
- a second switch connected to the output of the third gain element having a first level for connecting the output of the third gain element to the first lead of the second impedance and having a second state for connecting the output of the third gain element to the second lead of the second impedance.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 38 U.S. patent(s) that reference this one
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