Amplifier with an output current limiter

Details Amplifier with an output current limiter Amplifier with an output current limiter

1993-05-13

1994-11-08

Sikes, William L.

Amplifiers

With semiconductor amplifying device

Including protection means

330264, H03F 152, H04M 1900

Patent

active

053630637

ABSTRACT:
An amplifier is provided in an integrated circuit in MOS technology. To ensure current limitation of a push-pull type stage when the internal resistance of the output transistors is not sufficient to ensure the limitation, there is provided a circuit including a resistor for detecting whether the current value is exceeded; a limiting transistor connected across the resistor for detecting the overcurrent; a transistor for duplicating current in the limiting transistor and a resistor biasing this transistor; a connection between the duplicating transistor and the amplifier input; and an isolation transistor between the duplicating transistor and the amplifier input.

REFERENCES:
IEEE International Solid State Circuits Conference, vol. 24, Feb. 1981, New York, US, pp. 246-277, D. W. Aull et al., "Telecommunication Circuits".

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