Linear differential amplifier with unbalanced output

Details Linear differential amplifier with unbalanced output Linear differential amplifier with unbalanced output

1979-11-02

1981-10-06

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

330252, 330311, H03F 304, H03F 345

Patent

active

042938244

ABSTRACT:
A linear differential amplifier comprises two main transistors of one conductivity type (e.g. PNP) having emitters connected via a common constant-current generator to an ungrounded terminal of a d-c supply whose grounded other terminal is connected to their collectors via a pair of identical resistors; the base of one of these transistors is grounded while the base of the other transistor receives an a-c input signal. An unbalanced output signal is taken off the collector of an ancillary transistor of the opposite conductivity type (NPN) which is fed from the ungrounded supply terminal through a complementary auxiliary transistor or through another constant-current generator; the emitter of this output transistor is connected directly to the collector of the second main transistor.

REFERENCES:
K. B. Klaassen, "Common-mode Filter", Delft Progress Report Series B (Neitherlands), vol. 1, No. 2, Jul. 1975, pp. 31-35.

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