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US 2015/0084693 A1Published application
Programmable-gain instrumentation amplifier
AssigneeHoneywell International Inc.
InventorMark R. Larson
Life of this patent
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Abstract
A device comprises a first amplifier, a first resistive element that comprises a first resistor and a first dummy switch, a second amplifier, a second resistive element that comprises a second resistor and a second dummy switch, and a programmable resistive gain element operable to receive control input, wherein a resistance value of the programmable resistive gain element is based at least in part on the received control input, wherein a first end of the programmable resistive gain element is connected to both the first inverting input of the first amplifier and to a second end of the first dummy switch, and wherein a second end of the programmable resistive gain element is connected to both the second inverting input of the second amplifier and to a second end of the second dummy switch.
Claims20
A device comprising:
- a first amplifier that comprises a first non-inverting input, a first inverting input, and a first output, wherein the first non-inverting input of the first amplifier is connected to a first input voltage terminal;
- a first resistive element that comprises a first resistor and a first dummy switch, wherein a first end of the first resistive element is connected to the first output of the first amplifier, and a second end of the first resistive element is connected to the first inverting input of the first amplifier;
- a second amplifier that comprises a second non-inverting input, a second inverting input, and a second output, wherein the second non-inverting input of the second amplifier is connected to a second input voltage terminal;
- a second resistive element that comprises a second resistor and a second dummy switch, wherein a first end of the second resistive element is connected to the second output of the second amplifier, and a second end of the second resistive element is connected to the second inverting input of the second amplifier;
- and
- a programmable resistive gain element operable to receive control input, wherein a resistance value of the programmable resistive gain element is based at least in part on the received control input, wherein a first end of the programmable resistive gain element is connected to both the first inverting input of the first amplifier and to the second end of the first resistive element, and wherein a second end of the programmable resistive gain element is connected to both the second inverting input of the second amplifier and to the second end of the second resistive element.
3 more elements
(canceled)
A device comprising:
- a first amplifier that comprises a first non-inverting input, a first inverting input, and a first output, wherein the first non-inverting input of the first amplifier is connected to a first input voltage terminal;
- a second amplifier that comprises a second non-inverting input, a second inverting input, and a second output, wherein the second non-inverting input of the second amplifier is connected to a second input voltage terminal;
- a third amplifier that comprises a third non-inverting input, a third inverting input, and a third output, wherein the third output of the third amplifier is connected to an output voltage terminal;
- a first resistor, wherein a first end of the first resistor is connected to the first output of the first amplifier, and a second end of the first resistor is connected to a first end of a first dummy switch;
- a second resistor, wherein a first end of the second resistor is connected to the second output of the second amplifier, and a second end of the second resistor is connected to a first end of a second dummy switch;
- a third resistor, wherein a first end of the third resistor is also connected to the first output of the first amplifier, and a second end of the third resistor is connected to the third inverting input of the third amplifier;
- a fourth resistor, wherein a first end of the fourth resistor is connected to the second output of the second amplifier, and a second end of the fourth resistor is connected to the third non-inverting input of the third amplifier;
- a fifth resistor, wherein a first end of the fifth resistor is connected to the third inverting input of the third amplifier, and a second end of the fifth resistor is connected to the third output of the third amplifier;
- a sixth resistor, wherein a first end of the sixth resistor is connected to the third non-inverting input of the third amplifier, and a second end of the sixth resistor is connected to ground;
- and
- a programmable resistive gain element operable to receive input and adjust a resistance value of the programmable resistive gain element based at least in part on the received input, wherein a first end of the programmable resistive gain element is connected to both the first inverting input of the first amplifier and to a second end of the first dummy switch, and wherein a second end of the programmable resistive gain element is connected to both the second inverting input of the second amplifier and to a second end of the second dummy switch.
8 more elements
An integrated circuit comprising:
- a first amplifier that comprises a non-inverting input, an inverting input, and an output, wherein the non-inverting input is connected to a first input voltage terminal;
- a second amplifier that comprises a non-inverting input, an inverting input, and an output, wherein the non-inverting input is connected to a second input voltage terminal;
- a third amplifier that comprises a non-inverting input, an inverting input, and an output, wherein the output is connected to an output voltage terminal;
- a first resistor, wherein a first end of the first resistor is connected to the output of the first amplifier, and a second end of the first resistor is connected to a first end of a first dummy switch;
- a second resistor, wherein a first end of the second resistor is connected to the output of the second amplifier, and a second end of the second resistor is connected to a first end of a second dummy switch;
- a third resistor, wherein a first end of the third resistor is also connected to the output of the first amplifier, and a second end of the third resistor is connected to the inverting input of the third amplifier;
- a fourth resistor, wherein a first end of the fourth resistor is connected to the output of the second amplifier, and a second end of the fourth resistor is connected to the non-inverting input of the third amplifier;
- a fifth resistor, wherein a first end of the fifth resistor is connected to the inverting input of the third amplifier, and a second end of the fifth resistor is connected to the output of the third amplifier;
- a sixth resistor, wherein a first end of the sixth resistor is connected to the non-inverting end of the third amplifier, and a second end of the sixth resistor is connected to ground;
- and
- a programmable resistive gain element operable to receive input and adjust a resistance value of the programmable resistive gain element based at least in part on the received input, wherein a first end of the programmable resistive gain element is connected to both the first inverting input of the first amplifier and to a second end of the first dummy switch, and wherein a second end of the programmable resistive gain element is connected to both the second inverting input of the second amplifier and to a second end of the second dummy switch.
8 more elements
(canceled)
Dependencies are inferred from the claim text.