Patent ID: 6566953
Filing Date: 2003-05-20
Classification: H03F

Abstract:
A high-frequency amplifier circuit for a UHF television tuner, comprising:an FET having a first gate for inputting a UHF band television signal and a second gate for applying an AGO voltage which varies the gain, wherein said second gate is grounded via a series circuit including a resistor and a DC-cutting capacitor, between said second gate and ground, said AGO voltage is supplied to a node between said resistor and said DC-cutting capacitor, a resistance of said resistor is set in a range of about 50 &OHgr; to about 100 &OHgr;, and an inductance reactance of said DC-cutting capacitor is less than {fraction (1/20)} of a resistance of said resistor in the UHF band.