Patent ID: 7504887

Claim:
A high-frequency power amplifier, comprising: a bias supply transistor for supplying a bias to the base of a high-frequency amplifying transistor; a bias circuit for supplying a temperature-compensated bias current to the base of said bias supply transistor; and a first stabilizing element for stabilizing the base potential of said bias supply transistor at high frequencies wherein said bias circuit includes: a first temperature compensating transistor the collector of which is connected to the collector of said bias supply transistor, the emitter of which is grounded via a first resistor, and the base of which is connected to the base of said bias supply transistor via a second resistor; and a second temperature compensating transistor the collector of which is connected to the base of said bias supply transistor, the base of which is connected to the emitter of said first temperature compensating transistor, and the emitter of which is grounded; and wherein said first stabilizing element is connected between the base of said bias supply transistor and a ground, said high-frequency power amplifier further comprising a second stabilizing element connected to the base of said first temperature compensating transistor and said ground.