Amplifying circuit

Details Amplifying circuit Amplifying circuit

1978-05-31

1980-04-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330255, 330302, H03F 318

Patent

active

041997328

ABSTRACT:
An amplifying circuit comprising an input terminal to which an alternating current signal is applied; a first transistor; a second transistor where one of the first and second transistors is a NPN transistor and the other is a PNP transistor; an output terminal to which is connected the respective collectors of the first and second transistors means for operating the second transistor as a constant current source; and connecting means for connecting the alternating current signal at the input terminal to the respective bases of the first and second transistors where the connecting means includes a capacitor connected between the input terminal and the base of the second transistor to thereby connect to the second transistor substantially only those frequencies of the alternating current signal which are at least as high as the cut-off frequency of the first transistor although frequencies below the cut-off frequency may also be coupled to the second transistor in a further embodiment of this invention.

REFERENCES:
patent: 3760288 (1973-09-01), Leonard
patent: 3883813 (1975-05-01), Sekiya

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