Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-07-31
2000-03-14
Kim, Jung Ho
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327513, 323315, 323312, G05F 110
Patent
active
060378328
ABSTRACT:
A temperature dependent constant-current generating circuit includes a reference voltage generating circuit for generating a stable reference voltage against the power supply voltage and a temperature change, a stabilized voltage generating circuit for generating a stabilized voltage based on the reference voltage, a voltage divider for dividing the reference voltage, a common-emitter amplifier for amplifying an output voltage from the voltage divider, a current mirror circuit for outputting a current in a direction opposite to an output current from the amplifier, a current-to-voltage conversion resistor connected between the output terminal of the stabilized voltage generating circuit and the output terminal of the current mirror circuit, a buffer amplifier for receiving a voltage generated at the current input terminal of the resistor, and a current feedback output-stage amplifier driven by an output from the buffer amplifier. The constant-current generating circuit can generate a DC bias current which faithfully follows temperature variations in threshold current of an LD and has a high temperature compensation characteristic precision, and is a small-size, low-cost circuit and can be used in an LD driving circuit for fiber-optic subscriber systems including FTTH and optical links.
REFERENCES:
patent: 5223743 (1993-06-01), Nakagawara
patent: 5629611 (1997-05-01), McIntrye
patent: 5751142 (1998-05-01), Dosho et al.
patent: 5801582 (1998-09-01), Weber
Kabushiki Kaisha Toshiba
Kim Jung Ho
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