| 摘要 |
PURPOSE:To obtain a tracking error compensation circuit which corrects the temperature of a quartz filter itself whose center frequency varies with temperature, by holding a signal generated by a fixed local oscillator contant. CONSTITUTION:The constant-frequency signal of a fixed local oscillator 2 has an invariably constant oscillation frequency f0, and the output intermediate frequency signal of the 2nd mixer 6 has the constant frequency f0 without reference to fluctuations of temperature. If the center frequency of the filter band of a quartz filter 7 varies with temperature, a temperature compensation circuit 8 controlls the center frequency of the quartz filter 7 to a prescribed frequency all the time. The control is exercised under the command of a voltage control part 9 which supplies a control voltage to the temperature compensation circuit 8. |
