| 摘要 |
PROBLEM TO BE SOLVED: To make an S/N high and to make a separating shield and an amplifier simple and inexpensive. SOLUTION: A variable frequency divider 12 undergoes frequency dividing of an output of a VCO 31; a frequency converter 33 converts the output into a low frequency with an output of a direct digital synthesizer 32; a comparator 13 performs phase comparison of the frequency conversion output with a reference signal of a reference oscillator 14; and the comparison output is supplied to the VCO 31 through a loop filter 15 to control the VCO 31. For instance, 30 to 100MHz signal outputs an oscillation output of the VCO 31 to an output terminal 24 through a switch 34, and 100kHz to 30MHz signal outputs from the DDS 32 to the terminal 24. |
