Apparatus and method for high-bandwidth opto-coupler interface

Details Apparatus and method for high-bandwidth opto-coupler interface Apparatus and method for high-bandwidth opto-coupler interface

2008-01-15

2008-01-15

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Signal isolator

C250S2140RC, C327S514000

Reexamination Certificate

active

07319232

ABSTRACT:
An opto-coupler interface is provided. The opto-coupler interface includes a current mirror and a resistor. The opto-coupler interface is arranged such that a relatively fixed voltage is provided across the photodetector. At one end of the photodetector, the voltage is relatively fixed because the photodetector is coupled to the input of a current mirror. Because the voltage across the opto-coupler is relative fixed, the opto-coupler interface is a current interface rather than a voltage interface. Current from the photodetector is mirrored by the current mirror to provide an output mirror current. The output mirror current is provided to a resistor such that the resistor provides a voltage that is based on the output mirror current.

REFERENCES:
patent: 5276359 (1994-01-01), Chiang
patent: 5949085 (1999-09-01), Barrett
patent: 6349045 (2002-02-01), Kogel et al.
Radek Nalepa et al., Primary Side Control Circuit of a Flyback Converter, 2001 IEEE, pp. 542-547.
Mahmoud P. Sayani et al., Isolated Feedback for Off-Line Switching Power Supplies with Primary-Side Control, 1988 IEEE, pp. 203-211.
Daniel Victor Camin et al., Differential Optocoupler Amplifier with Low Noise, Low Power and Balanced Output, 2000 IEEE, pp. 2039-2044.

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