Switchable current amplifiers

Details Switchable current amplifiers Switchable current amplifiers

1977-09-06

1978-10-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

307255, H03F 304

Patent

active

041199243

ABSTRACT:
A current amplifier has its input terminal connected to the collector electrode of its master transistor by the forward-biased emitter-base junction of a complementary conductivity input transistor. This input transistor has its collector electrode connected with potential offset to the base electrode of the master transistor. The complementary conductivity transistor tends to operate in saturation, completing a collector-to-base feedback connection for the master transistor that regulates its emitter-to-base potential to its collector-to-emitter path to conduct substantially all the applied input current. A similar emitter-to-base potential is applied to a slave transistor having its collector electrode connected to the output terminal of the current amplifier and demanding a collector current as output current proportionally related to the input current. The current mirror amplifier operation is readily disabled by diverting the collector current of the input transistor away from the base electrode of the master transistor.

REFERENCES:
patent: 3900790 (1975-08-01), Ohsawa
Gersbach, "Current Source With Alpha Compensation," IBM Technical Disclosure Bulletin, vol. 19, No. 8, Jan. 1977, pp. 2949-2950.
Hirschfeld, "The Miser - An IC Stored Energy Regulator," Electronic Products Magazine, Nov. 15, 1971, pp. 54-56.

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