Voltage controlled laser diode drive circuit

Details Voltage controlled laser diode drive circuit Voltage controlled laser diode drive circuit

1996-07-29

1998-04-07

Hecker, Stuart N.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

372 29, 372 38, G05F 140, H01S 300

Patent

active

057368449

ABSTRACT:
A voltage controlled oscillator includes transistors Q1, Q2 and Q3 constituting a differential amplifier circuit. The differential amplifier circuit performs switching operations in accordance with input pulse signals. A current amplitude determined by the emitter current of the transistor Q3 drives a laser diode. An operational amplifier 6 has an output connected to the base of the transistor Q3 via an emitter follower Q7. A control terminal 7 is connected to the non-inverting input of the operational amplifier 6. A voltage applied to the control terminal 7 controls the base potential of the transistor Q3, thereby changing the emitter current of the transistor Q3. The current for driving the laser diode is controlled by the voltage signal via the emitter follower. Therefore, the ON/OFF control of the drive current can be executed surely and stably without being influenced by noise, wiring pattern capacity or the like and even from the outside of the laser diode drive circuit.

REFERENCES:
patent: 5115147 (1992-05-01), Kusano et al.
patent: 5463648 (1995-10-01), Gibbs
patent: 5477557 (1995-12-01), Inaba et al.
patent: 5521933 (1996-05-01), Sosa
patent: 5530936 (1996-06-01), Harasawa
patent: 5563898 (1996-10-01), Ikeuchi et al.

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