Short circuit protection

Details Short circuit protection Short circuit protection

2006-04-18

2006-04-18

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

Reexamination Certificate

active

07031127

ABSTRACT:
Output current of an amplifier is limited by clamping the voltage at the gate of one or more of the transistors in the output stage. A drive signal is provided to the gate of a p-type transistor in an example output stage. Another p-type transistor is activated in a short-circuit protection circuit when the drive signal is below a pre-determined level, whereby the short-circuit protection circuit is activated to clamp the drive signal. Similarly, an n-type transistor in another short-circuit protection circuit may be configured to clamp another drive signal for an n-type output stage. The short-circuit protection methodology may be applied to output stages such as in class A and class AB amplifiers.

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patent: 2005/0162189 (2005-07-01), Tanabe
Sedra et al., “Microelectronic Circuits”, Third Edition, pp. 677-678, 1991.

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