Radio frequency amplifier with stable operation and restrained oscillation at low frequencies

摘要

In a radio frequency amplifier, a resistor and an inductor are connected to a gate terminal of transistor such as an FET. Another resistor for preventing oscillation is connected to the inductor. A capacitor and a third resistor connected to each other in parallel are connected to the first resistor while the other ends thereof are grounded. A resistance value of the resistor for preventing oscillation is in the range of about 30 OMEGA to about 70 OMEGA . An inductance value of the inductor is such that an impedance value for a low frequency becomes negligibly small.