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US 10,511,275 B2Granted
Common mode sensing architecture
AssigneeMicrochip Technology Incorporated
InventorsDong Wang, Jim Nolan, Kumen Blake, Milan Rai
Life of this patent
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Abstract
An amplifier includes a differential positive input, a differential negative input, and a transistor. The transistor is communicatively coupled to the differential positive input and differential negative input at a source of the transistor. The transistor is configured to track input common mode of the differential positive input and differential negative input.
Claims20
A common mode sensing amplifier, comprising:
- a differential positive input;
- a differential negative input;
- a first transistor, wherein:
- the first transistor is communicatively coupled to the differential positive input and differential negative input at a source of the first transistor;
- and
- the first transistor is configured to track input common mode of the differential positive input and differential negative input;
- and
- a resistive network, wherein:
- a first end of the resistive network is configured to receive input from the differential positive input and a second end of the resistive network is configured to receive input from the differential negative input;
- and
- the first transistor is coupled to the resistive network at a source of the first transistor.
8 more elements
A common mode sensing amplifier, comprising:
- a differential positive input;
- a differential negative input;
- a first transistor, wherein:
- the first transistor is communicatively coupled to the differential positive input and differential negative input at a source of the first transistor;
- and
- the first transistor is configured to track input common mode of the differential positive input and differential negative input;
- and
- a plurality of cross-coupled current sources, wherein the cross-coupled current sources are configured to match current differential between the differential positive input and differential negative input.
5 more elements
A system, comprising:
- a resistive network;
- an instrumentation amplifier;
- a common mode output;
- a differential positive input;
- and
- a differential negative input;
- wherein:
- the differential positive input and the differential negative input are configured to receive a sensor signal;
- the instrumentation amplifier includes a transconductance amplifier, the transconductance amplifier including a first transistor;
- the first transistor is communicatively coupled to the differential positive input and differential negative input at a source of the first transistor;
- the first transistor is configured to track input common mode of the differential positive input and differential negative input;
- the instrumentation amplifier is configured to generate a bias signal from the input common mode on the common mode output for a signal source connected to the differential positive input and differential negative input;
- a first end of the resistive network is configured to receive input from the differential positive input and a second end of the resistive network is configured to receive input from the differential negative input;
- and
- the first transistor is coupled to the resistive network at a source of the first transistor.
12 more elements
A system, comprising:
- an instrumentation amplifier including a plurality of cross-coupled current sources;
- a common mode output;
- a differential positive input;
- and
- a differential negative input;
- wherein:
- the differential positive input and the differential negative input are configured to receive a sensor signal;
- the instrumentation amplifier includes a transconductance amplifier, the transconductance amplifier including a first transistor;
- the first transistor is communicatively coupled to the differential positive input and differential negative input at a source of the first transistor;
- the first transistor is configured to track input common mode of the differential positive input and differential negative input;
- the instrumentation amplifier is configured to generate a bias signal from the input common mode on the common mode output for a signal source connected to the differential positive input and differential negative input;
- and
- the cross-coupled current sources are configured to match current differential between the differential positive input and differential negative input.
10 more elements
A method, comprising:
- receiving, at a transconductance amplifier, a differential positive input;
- receiving, at the transconductance amplifier, a differential negative input, wherein the differential positive input and differential negative input make up a sensor signal;
- tracking, by a first transistor of the transconductance amplifier, input common mode of the differential positive input and differential negative input;
- generating a bias signal from the input common mode on the common mode output for a signal source of the sensor signal;
- receiving input from the differential positive input at a first end of a resistive network
- receiving input from the differential negative input at a second end of the resistive network;
- and
- applying output from the resistive network to a source of the first transistor.
5 more elements
A method, comprising:
- receiving, at a transconductance amplifier, a differential positive input;
- receiving, at the transconductance amplifier, a differential negative input, wherein the differential positive input and differential negative input make up a sensor signal;
- tracking, by a first transistor of the transconductance amplifier, input common mode of the differential positive input and differential negative input;
- generating a bias signal from the input common mode on the common mode output for a signal source of the sensor signal;
- and
- using a plurality of cross-coupled current sources to match current differential between the differential positive input and differential negative input.
3 more elements
Dependencies are inferred from the claim text.