Grounded-base transistor amplifier

Details Grounded-base transistor amplifier Grounded-base transistor amplifier

1995-09-19

1997-02-11

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

056025084

ABSTRACT:
A grounded-base transistor amplifier including a pair of transistors which have the bases thereof grounded at a high frequency and the collectors thereof coupled to a signal output terminal, a high frequency transformer which includes a primary winding connected to a signal input terminal and a secondary winding equipped with a midpoint tap, both ends of the secondary winding being connected to the emitters of the transistors, and a constant-current circuit which is connected to the midpoint tap of the secondary winding and which produces a bias current flow through the transistors. Noise voltages generated by the constant-current circuit are supplied to the emitters of the transistors in the same phase via the secondary winding; therefore, no noise voltage appears at the signal output terminal.

REFERENCES:
patent: 3748588 (1973-07-01), Beorrier
patent: 4374363 (1983-02-01), Peviti
patent: 5337010 (1994-08-01), Nishiyama

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