| 摘要 |
PURPOSE:To decrease distortion in a high frequency reception signal in a high frequency amplifier circuit by adding the 2nd tuning control voltage generating circuit having a prescribed function in addition to the 1st tuning control voltage generating circuit. CONSTITUTION:The tuning control voltage generating circuit 25 is added in addition to the tuning control voltage generating circuit 11. The tuning control voltage generating circuit 25 changes the tuning control voltage from the circuit 11 in response to the detected output of a frequency detection circuit 9, gives the result to tuning circuits 2, 4 of a high frequency amplifier circuit RA to control the tuning frequency in a way that it follows nearly the high frequency reception signal. Thus, the amplitude characteristic of the output of the high frequency amplifier circuit RA is made nearly flat and the phase characteristic is made nearly so as to decrease the distortion of the high frequency reception signal in the high frequency amplifier circuit RA.
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