| 摘要 |
A transistor amplifier utilizes a dual loop feedback control circuit and an impedance matching circuit to provide improved linear and return loss performance characteristics. The transistor amplifier comprises a transistor for linearly amplifying an input signal, the transistor having a base, a collector and an emitter, the base having an input impedance, the collector having an output impedance. The dual loop feedback control circuit comprising a series feedback resistor electrically coupled between the emitter and a ground potential and a shunt feedback resistor electrically coupled between the collector and base. The dual loop feedback control circuit converts the input impedance to a conjugate of a source resistance and the output impedance to optimum load impedance. The impedance matching circuit electrically coupled between the collector and a receiving circuit converts a load resistance to a conjugate of the output impedance and the output impedance to a conjugate of a load resistance at a predetermined frequency.
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