Amplifier output clamping scheme

Details Amplifier output clamping scheme Amplifier output clamping scheme

1997-01-10

1999-03-02

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, 360 7804, 330267, G11B 5596, H03F 326

Patent

active

058779140

ABSTRACT:
An amplifier in which a clamping circuit is an integral part of the output stage structure is used as a voice coil driver for positioning the heads of a memory disk drive. The output stage, operating in class AB, comprises two bipolar transistors, the source and the sink transistors, serially connected between a power supply and a ground terminal, the serial connection between the emitter of the first transistor and the collector of the second transistor being the output terminal of the output stage. The base terminals of the two output transistors are connected to a bias circuit and to an input transistor, used as the signal control element. The clamping circuit is directly connected with the base terminals of the output transistors to limit the voltage on said base terminals between a first and a second voltage reference.

REFERENCES:
patent: 4286227 (1981-08-01), Sato
patent: 5216382 (1993-06-01), Ito
patent: 5297024 (1994-03-01), Carobolante
patent: 5337012 (1994-08-01), Dijkmans

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