Amplifiers – With semiconductor amplifying device – Including combined diverse-type semiconductor device
Patent
1990-02-12
1991-06-11
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including combined diverse-type semiconductor device
330298, 307544, H01H 720, H03K 508
Patent
active
050235702
ABSTRACT:
An emitter-follower circuit includes a bipolar transistor of a first conductivity type operating as an emitter-follower transistor and a bipolar transistor of a second conductivity type operable as a clamping transistor. The voltage developed between the base and the emitter of the second conductivity type clamping transistor is adapted to clamp the voltage developed between the base and the collector of the first conductivity type transistor, so that such a high voltage as exceeding the breakdown voltage is not developed between the collector and the emitter of the first conductivity type transistor. The emitter-follower circuit is capable of operating with safety even when an input signal applied thereto has a wide range of direct current components.
REFERENCES:
patent: 3668545 (1972-06-01), Von Recklinghausen
patent: 3678408 (1972-07-01), Suzuki
patent: 4451747 (1984-05-01), Rucker, III
Mottola Steven
NEC Corporation
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