Circuit for temperature and beta compensation
First Claim
1. A compensation circuit, comprising:
- a differential output device including a first emitter to provide a differential output;
a sensing device disposed locally to the differential output device, the sensing device including a second emitter; and
a feedback circuit coupled to the second emitter of the sensing device, the feedback circuit to generate a feedback signal to adjust the differential output and to apply the feedback signal to a node of a driver stage.
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Accused Products
Abstract
A compensation circuit is disclosed. The compensation circuit includes a driver stage having an output, a differential output device including a base coupled to the output of the driver stage, and a feedback block coupled to a first emitter of the differential output device. The differential output device includes a second emitter to provide a differential output, and the feedback block generates a feedback signal to adjust the differential output. The first emitter comprises a replicating transistor, and is proximate to the second emitter of the differential output device. By keeping the replicating emitter near the differential output device, the variances of temperature and process over the semiconductor die do not affect the performance of the compensation circuit. The compensation circuit may also compensate for variations in common-emitter current gain.
20 Citations
33 Claims
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1. A compensation circuit, comprising:
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a differential output device including a first emitter to provide a differential output; a sensing device disposed locally to the differential output device, the sensing device including a second emitter; and a feedback circuit coupled to the second emitter of the sensing device, the feedback circuit to generate a feedback signal to adjust the differential output and to apply the feedback signal to a node of a driver stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for compensation of a circuit comprising:
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sensing variations in at least one of temperature or common-emitter current gain in the circuit using a sensing device disposed locally to a differential output device; and applying a feedback signal to a node of a driver stage to compensate for the variations, wherein the feedback signal is generated by a feedback circuit coupled to the sensing device. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A compensation circuit, comprising:
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means for compensating for at least one of temperature or common emitter current gain in a circuit using a sensing device disposed locally to a differential output device, wherein the means for compensating for at least one of temperature or common emitter current gain is incorporated into the differential output device; and a driver stage including an output coupled to the differential output device; wherein the means for compensating comprises; means for detecting a variation of an output signal generated by the differential output device; and means for correcting the output signal generated by the differential output device. - View Dependent Claims (31, 32, 33)
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Specification