| 摘要 |
PURPOSE:To generate plural kinds of reference frequency signals with simple and inexpensive constitution by changing over a switch element so as to allow a voltage controlled oscillator to generate selectively the plural kinds of different reference frequency signals. CONSTITUTION:When a switch diode 8 is short-circuited by a switching voltage, the phase lock is taken in the 1st reference frequency decided by the time constant comprising a capacitor 5A and a variable resistor 4 adjusted minutely. When the diode 8 is opened, the phase lock is taken at the 2nd reference frequency decided by the time constant comprising the capacitor 5A, a capacitor 5B and a variable resistor 4 adjusted minutely. |
