Patent ID: 7003007

Claim:
A laser diode driver output stage for driving an associated laser diode device, the laser diode driver output stage comprising: a driver circuit having at least one input node and an output node, the driver circuit adapted to receive an input data signal at the at least one input node and provide an output signal at the output node in response to the data signal; a transformer coupled to the output node of the driver circuit, the transformer adapted to receive the output signal at a first side of the transformer and apply impedance compensation to the output signal to provide an output drive signal from a second side of the transformer, whereby the output drive signal is used to drive the associated laser diode device, the first side of the transformer further comprises a primary side and the second side of the transformer further comprises a secondary side, a negative terminal of the primary side of the transformer is adapted to receive the output signal from the drive circuit, a negative terminal of the secondary side of the transformer is adapted to provide the output drive signal, said primary side of the transformer is adapted to compensate for a parasitic capacitance associated with the driver circuit at a first frequency of operation; a primary side resistor coupled in parallel with the primary side of the transformer, the primary side resistor is adapted to repress an output impedance associated with the primary side of the transformer at a second frequency of operation higher than the first frequency of operation; and a termination resistor connected to a positive terminal of the primary side of the transformer, wherein the output impedance of the laser diode driver output stage is substantially equal to a the impedance of the termination resistor at a third frequency of operation lower than the first frequency of operation.