| 摘要 |
PURPOSE:To decrease the number of parts by making the glass delay line concurrently execute the operation of an (n) multiplying circuit. CONSTITUTION:The amplitude limiting amplifier 18 and (1H-DELTAgamma) DL21' are made to have a function of a 3 multiplying circuit 19a newly in addition to the respective original functions. A glass delay line is used as (1H-DELTAgamma) DL21'. That is to say, the glass delay line is not only a delay line of (1H-DELTAgamma) but also concurrently a band pass filter of the center frequency 4.5MHz and the pass band + or -0.5MHz. The output of the amplitude limiting amplifier 18 is a pulse waveform by which an index frequency fi is made a repetitive frequency, and contains a lot of modulated waves. Accordingly, when the center frequency of (1H-DELTAgamma) DL21' is selected as 3fi and its pass band is selected as 2fi or less, it is possible to obtain a sine wave of constant amplitude, which has frequency fT=3fi required for the output terminal of (1H-DELTAgamma) DL21'. |
