Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1977-03-14
1978-01-17
Dahl, Lawrence J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 51, 330103, 330282, H03F 345
Patent
active
040694615
ABSTRACT:
The input stage of an amplifier circuit formed from first and second semiconductor differential amplifiers comprising a pair of transistors having emitter electrodes connected to each other, respectively. The respective collector electrodes of one pair of transistors in each of the first and second semiconductor differential amplifiers is connected to the respective collector electrodes of the other pair of transistors, the base electrode of one transistor of each pair of transistors respectively being connected to an input terminal of the amplifier circuit and the base electrode of the other transistor of each pair of transistors respectively being connected to first and second negative feedback circuits connected to the output stage of the amplification circuit. First and second electrical switches are respectively connected to the common emitter electrodes of each pair of transistors. One of the first and second electrical switches is controlled to be closed selectively.
REFERENCES:
patent: 3781697 (1973-12-01), Bruinshorst et al.
Dahl Lawrence J.
Tokyo Shibaura Electric Co. Ltd.
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