摘要:
An AC negative feedback circuit (14) includes a semiconductor impedance element (41) connected to an external terminal (11d) on the substrate on which the whole device is formed, and variable control means (20) for adjusting the amount of AC feedback of the high frequency amplifier circuit. As the semiconductor impedance element is used the junction capacitance of a diode (41) under negative bias, diffusion capacitance between the base and emitter electrodes or between the base and collector electrodes of a transistor (51) or a differentiated resistance of a diode (62).
摘要:
An AC negative feedback circuit (14) includes a semiconductor impedance element (41) connected to an external terminal (11d) on the substrate on which the whole device is formed, and variable control means (20) for adjusting the amount of AC feedback of the high frequency amplifier circuit. As the semiconductor impedance element is used the junction capacitance of a diode (41) under negative bias, diffusion capacitance between the base and emitter electrodes or between the base and collector electrodes of a transistor (51) or a differentiated resistance of a diode (62).