High frequency amplifier circuit for fm


PURPOSE: To improve image interference characteristic while maintaining the high degree of selection in the high frequency amplifier circuit for FM. CONSTITUTION: On the output side of a π type tuning circuit 9 in the front stage, a gate set to the high impedance of an impedance conversion element 10 consisting of an FET is connected. The input signal is converted into low impedance. It is inputted from the source to the π type tuning circuit 13 in the rear stage. COPYRIGHT: (C)1992,JPO&Japio




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