Reduced output capacitance circuit for driving a grounded load i

Details Reduced output capacitance circuit for driving a grounded load i Reduced output capacitance circuit for driving a grounded load i

1997-05-12

1999-04-27

Wells, Kenneth B.

Excavating

Scoop or excavating and transporting container

327361, 327413, H03K 1762

Patent

active

058983341

ABSTRACT:
A circuit for generating an output signal used for driving a grounded load is provided. The circuit provides an output signal without glitches or spikes. The circuit also outputs a drive signal with enhanced responsiveness in transitioning from one output value level to another output value level. The circuit includes a plurality of control devices for providing respective output signals responsive to respective control signals. The base of a PNP transistor is coupled to the output of the control devices and acts as a buffer. The emitter of the PNP transistor is coupled to a voltage source and the collector is coupled to a grounded load for providing the drive current. Alternatively, an NPN transistor and current source provides the drive current to the grounded load. The circuitry may be used in an optical disk drive with the load and ground being a laser diode used for providing a laser beam in reading/writing an optical disk.

REFERENCES:
patent: 4239989 (1980-12-01), Brajder
patent: 4686674 (1987-08-01), Lam

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