Grounded-base transistor amplifier

Details Grounded-base transistor amplifier Grounded-base transistor amplifier

H - Electricity

03

F

H03F 3/04 (2006.01) H03F 1/26 (2006.01) H03F 3/19 (2006.01) H03F 3/26 (2006.01) H03F 3/45 (2006.01)

Patent

CA 2158628

A grounded-base transistor amplifier which is capable of almost completely cancelling a noise voltage generated in a transistor of a constant-current circuit so as to provide an extremely low noise figure is equipped with: 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 pair of transistors; and a constant-current circuit which is connected to the midpoint tap of the secondary winding and which lets a bias current flow through the pair of transistors. In this case, a noise voltage generated in a transistor of the constant-current circuit to the emitters of the pair of transistors is supplied phase via the secondary winding; therefore, no noise voltage appears at the signal output terminal.

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