Transient protection circuit of Darlington amplifier

Details Transient protection circuit of Darlington amplifier Transient protection circuit of Darlington amplifier

2005-09-13

2005-09-13

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S20700P

Reexamination Certificate

active

06943629

ABSTRACT:
A protection circuit for Darlington amplifiers prevents destructive voltage overshoot conditions from occurring. The Darlington amplifier has a pair of transistors connected in a Darlington configuration. A biasing network is coupled to the transistors for supplying a bias voltage to the transistors. A pair of de-coupling capacitors is coupled to the transistors. One of the de-coupling capacitors is coupled to the input of the Darlington amplifier and the other is coupled to the output. The output capacitor has a larger capacitance than the input capacitor such that excessive voltage is prevented from developing on the transistors.

REFERENCES:
patent: 3866134 (1975-02-01), Higuchi et al.
patent: 3883814 (1975-05-01), Weisenberger
patent: 4077013 (1978-02-01), Morez et al.
patent: 5867061 (1999-02-01), Rabjohn et al.
patent: 6842075 (2005-01-01), Johnson et al.

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