Current transfer ratio temperature coefficient compensation method and apparatus for an optocoupler
AssigneeAvago Technologies ECBU IP (Singapore) Pte. Ltd.
InventorsKah Weng Lee, Bin Zhang
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Abstract
An optocoupler system includes a buffer, isolation, and a detector. The system includes a current transfer ratio (CTR) with a temperature coefficient. The buffer includes a light source that generates light that passes through the isolation. A detector receives light that passes through the isolation and generates an output signal based on the received light. A current transfer ratio (CTR) temperature coefficient compensation mechanism is provided that generates a base signal with a temperature coefficient that compensates the temperature coefficient of the CTR.
Claims12
A method for compensating the current transfer ratio temperature coefficient;
- wherein the method includes:
- generating a first signal that matches one of process variations and temperature variations in a threshold signal;
- generating a second signal that compensates for temperature coefficient of a current transfer ratio;
- generating a base signal based on the first signal and the second signal;
- wherein the base signal compensates the temperature coefficient of the CTR.
A current transfer ratio (CTR) temperature coefficient compensation apparatus in an optocoupler with a current transfer ratio (CTR) between a light source drive signal and a light detector signal, the current transfer ratio (CTR) having a temperature coefficient, the apparatus comprising:
- a first current source that generates a first signal that matches variations in a reference signal;
- and
- a second current source that generates a second signal that selectively compensates the temperature coefficient of the CTR;
- wherein a base signal is generated by the apparatus that is based on the first signal and the second signal.
Dependencies are inferred from the claim text.