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US 2004/0164793 A1Published application
Differential circuit with a linearity correction loop
AssigneeTexas Instruments Incorporated
InventorJohn M. Muza
Life of this patent
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Abstract
A differential circuit with linearity correction loop includes a main differential amplifier 30, and a correction amplifier 20 having inputs coupled to the outputs of the main differential amplifier 30 through feedback paths. The output signals from the correction amplifier 20 are combined with the inputs to the main amplifier 30 such that a negative feedback loop is formed around the differential circuit. This feedback loop provides stability with only a minor power increase.
Claims20
A differential circuit with a linearity correction loop comprising:
- a main differential amplifier;
- a correction amplifier having a first input coupled to a first output of the main differential amplifier and to a first input node, and a second input coupled to a second output of the main differential amplifier and to a second input node;
- a first summing node having a first input coupled to the first input node, a second input coupled to a first output of the correction amplifier, and an output coupled to a first input of the main differential amplifier;
- a second summing node having a first input coupled to the second input node, a second input coupled to a second output of the correction amplifier, and an output coupled to a second input of the main differential amplifier.
1 more element
A differential circuit with a linearity correction loop comprising:
- a main differential amplifier;
- a first feed back device coupled to a first output of the main differential amplifier;
- a second feed back device coupled to a second output of the main differential amplifier;
- a correction amplifier having a first input coupled to the first feed back device and to a first input node, and a second input coupled to the second feed back device and to a second input node;
- a first summing node having a first input coupled to the first input node, a second input coupled to a first output of the correction amplifier, and an output coupled to a first input of the main differential amplifier;
- a second summing node having a first input coupled to the second input node, a second input coupled to a second output of the correction amplifier, and an output coupled to a second input of the main differential amplifier.
3 more elements
Dependencies are inferred from the claim text.