FREQUENCY TUNING CIRCUIT,申请号JP19840271537-传众专利搜索

FREQUENCY TUNING CIRCUIT

申请公布号：JPS61148911(A)

申请号：JP19840271537

申请日期：1984.12.21

申请公布日期：1986.07.07

申请人：

MITSUBISHI ELECTRIC CORP

发明人：HAMADA YOSHIO

分类号：H03J5/00;H04B1/26

主分类号：H03J5/00

摘要：PURPOSE:To improve the frequency tuning accuracy of an output signal even when the accuracy of a fixed frequency oscillator is not so much high by adding a variable frequency oscillator and a frequency converter mixing an output signal of the fixed frequency oscillator. CONSTITUTION:An input signal fR is mixed with a variable frequency control signal fL from the 3rd frequency converter 3 by the 1st frequency converter 2. Then an output signal fIF1 from the 1st frequency converter 2 is mixed with an oscillated output signal fL2 from the fixed frequency oscillator 6 by the 2nd frequency converter 5 and the result is outputted to a signal output terminal 7. Thus, the output signal at the output terminal 7 is not immune to the effect of the oscillating output signal from the fixed frequency oscillator 5, that is, the effect of frequency fluctuation. Thus even when the accuracy of the fixed frequency oscillator is not so much high, the frequency tuning accuracy is improved.