Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-09-08
1980-01-08
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
250381, 330264, 330300, 340384E, G08B 1710, G08B 2100, H03F 316
Patent
active
041830202
ABSTRACT:
A field effect transistor in common-drain amplifier connection is followed in direct-coupled cascade by a bipolar transistor of similar conductivity type, in common-emitter amplifier connection, and without emitter degeneration resistance for limiting its collector current by means of current feedback. Rather the collector current is limited by (a) restricting the range of source voltage variation of the field effect transistor by a threshold conducting means between the source electrode of the field effect transistor and the emitter electrode of the bipolar transistor and (b) inserting a resistance between the source electrode of the field effect transistor and the base electrode of the bipolar transistor to limit the maximum base drive current available to the bipolar transistor when the restricted source voltage of the field effect transistor departs most from the emitter voltage of the bipolar transistor.
REFERENCES:
patent: 3441864 (1969-04-01), Hafler
patent: 3500218 (1970-03-01), Burwen
patent: 3526845 (1970-09-01), Sikorra
patent: 3536958 (1970-10-01), Sondermeyer
patent: 3796967 (1974-03-01), Sondermeyer
patent: 3921089 (1975-11-01), Tsurushima
patent: 3974456 (1976-08-01), Russell et al.
patent: 4054805 (1977-10-01), Stebbins
patent: 4097851 (1978-06-01), Klein
patent: 4103190 (1978-07-01), Beutler
patent: 4118689 (1978-10-01), Peil
Caldwell Sr. John W.
Meise William H.
Myer Daniel
O'Meara John M.
Rasmussen Paul J.
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