H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/17, 179/35
H03F 3/26 (2006.01) H03F 1/02 (2006.01) H03F 3/21 (2006.01) H03G 3/04 (2006.01)
Patent
CA 1124652
ABSTRACT OF THE DISCLOSURE A power amplifier circuit is mainly composed of an amplifier including an input transistor, a driving transistor and a power amplifying transistor. This power amplifying transistor is connected at its output end to an output trans- former the secondary winding of which is connected to a first adjusting means for adjusting an output impedance of the power amplifying transistor. A second adjusting means, which is interlocked with the first adjusting means, is provided on the current path of the driving transistor to adjust the value of an emitter resistance of the driving transistor, and the biasing voltage of the power amplifying transistor is obtained from the current path of the driving transistor, thus the power consumption of this circuit being reduced by the adjustment of the first and second adjusting means.
319916
Gowling Lafleur Henderson Llp
Sony Corporation
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