Independent control loops for mitigating positive and negative mismatches in differential amplifiers
AssigneeMACOM Technology Solutions Holdings, Inc.
InventorsDuy Nguyen, William Allen
Life of this patent
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Abstract
Independent control loops for mitigating positive and negative mismatch in differential amplifiers are provided. A method includes comparing a first voltage measured at a positive side output of an emitter follower with a reference voltage, resulting in a first voltage difference. The method also includes comparing a second voltage measured at a negative-side output of the emitter follower with the reference voltage, resulting in a second voltage difference. In addition, the method includes independently controlling the positive side and the negative side of the differential amplifier based on the first voltage difference and the second voltage difference.
Claims20
A differential amplifier, comprising:
- a positive side with an input node connected to an output of a first control loop;
- a negative side with an input node connected to an output of a second control loop;
- and
- a circuit for correcting a mismatch between the positive side of the differential amplifier and the negative side of the differential amplifier, the circuit comprising:
- a positive side transistor connected to an input of the first control loop;
- a negative side transistor connected to an input of the second control loop;
- a first resistor connected between an input voltage source and the positive side transistor;
- and
- a second resistor connected between the input voltage source and the negative side transistor.
A circuit for correcting a mismatch between a positive side and a negative side of a differential amplifier, the circuit comprising:
- a first transistor operatively connected to an input of a first control loop;
- a second transistor operatively connected to an input of a second control loop;
- a first resistor positioned between an input voltage source and the first transistor;
- and
- a second resistor positioned between the input voltage source and the second transistor.
A circuit for correcting a mismatch between a positive side and a negative side of a differential amplifier, the circuit comprising:
- a positive side transistor operatively connected to an input of a first control loop;
- a first resistor positioned between an input voltage source and the positive side transistor, wherein a first DC current flowing through the first resistor and the positive side transistor is controllable by the first control loop;
- and
- a negative side transistor operatively connected to an input of a second control loop.
Dependencies are inferred from the claim text.