High speed variable output power driver

Details High speed variable output power driver High speed variable output power driver

H - Electricity

03

G

H03G 1/00 (2006.01) H03F 1/22 (2006.01) H03F 3/45 (2006.01) H03F 3/72 (2006.01)

Patent

CA 2307684

The invention relates to a driver circuitry suitable for controlling an operation of a laser or an optical modulator and providing extended dynamic range of the output power and enhanced quality of the output signal. It comprises a power control unit, a pre-driver stage and an output stage. The pre-driver stage and the output stage include differential amplifiers, the output stage amplifier preferably having a cascode configuration. The pre-driver stage provides a preliminary amplification of an input signal which is received and further amplified by the output stage. The power control unit operates in response to a reference signal, e.g. variable DC voltage or a feedback signal, and generates two control signals which control operating points of the pre-driver and the output stage in such a manner that higher output power of the driver corresponds to the higher output signal from the pre-driver stage. Conveniently, both the pre-driver stage and the output stage may be controlled by the same control signal. Depending on the product requirements, the driver circuit can be monolithically integrated with a device to be driven by the circuit.

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