Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Patent
1981-05-26
1984-03-06
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
330165, H03F 100
Patent
active
044356862
ABSTRACT:
Disclosed is a cascode amplifier circuit with improved current gain, linearity, overload performance and bandwidth which uses a step-down (of voltage) transformer between a driver stage and an output stage. One end of the primary of the transformer is connected to a driver transistor's collector and the other end is connected to the collector of a grounded-base output transistor. The transformer secondary is connected across the base and emitter of the output transistor. The transformer windings are phased such that a large driver current is forced through a high impedance, i.e. the primary winding impedance which is a multiple of the common base input impedance of the output transistor, resulting in power gain. The amplifier is capable of high maximum overloaded power output free of "break-up" of the waveform compared with conventional cascode operation, as well as greater power gain. By using transistors with high resistivity base material the amplifier operation is resistant to degradation by ionizing radiation and protected against secondary breakdown.
Mullins James B.
Wan Gene
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