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US 2020/0083852 A1Published application
Amplifier
AssigneeAnalog Devices, Inc.
InventorMichael J. Guidry
Life of this patent
Estimating the term…
Abstract
An instrumentation amplifier including a pair of input amplifiers, each including an input transistor and a feedback current amplifier configured to amplify and feedback an error current from the input transistor. The arrangement can enable a current efficient solution where the amplifier can operate with very low input signals that are close to, or potentially below ground, without requiring a negative power supply voltage.
Claims20
An instrumentation amplifier comprising:
- a first stage configured to generate an amplified differential output based on a differential input, the first stage including:
- a first amplifier including:
- a first transistor, wherein a gate of the first transistor is coupled to a first input of the differential input, and
- a first current amplifier coupling a drain of the first transistor to a first output of the differential output;
- a second amplifier including:
- a second transistor, wherein a gate of the second transistor is coupled to a second input of the differential input, and
- a second current amplifier coupling a drain of the second transistor to a second output of the differential output;
- and
- a resistor network including:
- a first feedback resistor coupling the first output to a source of the first transistor;
- and
- a second feedback resistor coupling the second output to a source of the second transistor.
9 more elements
An instrumentation amplifier comprising:
- a differential input;
- a differential output;
- a first amplifier comprising:
- a first transistor, wherein a gate terminal of the first transistor is coupled to a first input of the differential input, and
- a first feedback current amplifier coupling a drain terminal of the first transistor to a source terminal of the first transistor and a first output of the differential output;
- and
- a second amplifier comprising:
- a second transistor, wherein a gate terminal of the second transistor is coupled to a second input of the differential input, and
- a second current feedback amplifier coupling a drain terminal of the second transistor to a source terminal of the second transistor and a second output of the differential output.
6 more elements
An energy measurement frontend IC comprising:
- an instrumentation amplifier configured to couple to a current sensor and amplify a current sensor signal, the instrumentation amplifier including:
- a first amplifier including:
- a first transistor, wherein a gate of the first transistor is coupled to a first input of the differential input, and
- a first current amplifier coupling a drain of the first transistor to a first output of the differential output;
- a second amplifier including:
- a second transistor, wherein a gate of the second transistor is coupled to a second input of the differential input, and
- a second current amplifier coupling a drain of the second transistor to a second output of the differential output;
- and
- a resistor network including:
- a first feedback resistor coupling the first output to a source of the first transistor;
- a second feedback resistor coupling the second output to a source of the second transistor;
- and
- a connecting resistor coupling the source of the first transistor to the source of the second transistor.
10 more elements
Dependencies are inferred from the claim text.