Amplifiers – With semiconductor amplifying device – Including protection means
Patent
1984-09-27
1987-07-21
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including protection means
330146, 330207P, 361 79, 361 88, 361101, H03F 2100
Patent
active
046821201
ABSTRACT:
A short circuit protection device for a unitary voltage gain signal transducer circuit (G.sub.v) and for a load impedance (R.sub.L) coupled to the transducer circuit includes a first (A.sub.1) and a second (A.sub.2) threshold comparator circuit and an actuator circuit (ACT). The input terminals of the first comparator (A.sub.1) are coupled to the transducer circuit input and output terminals and the output terminal of the first comparator is coupled to an activation terminal of the actuator circuit. The input terminals of the second comparator (A.sub.2) are coupled to the ends of the load impedance and the output terminal is coupled to an inhibit terminal of the actuator circuit. A first output terminal of the actuator circuit is coupled to an inhibit terminal of the transducer circuit, while a second output terminal of the transducer circuit is used to deliver a small current I.sub.1 to the load impedance.
REFERENCES:
patent: 3792316 (1974-02-01), Bondini et al.
patent: 3990020 (1976-11-01), Porter, III
patent: 4368436 (1983-01-01), Palara et al.
Palara Sergio
Torazzina Aldo
Mullins James B.
SGS Microelettronica S.p.A.
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