| 摘要 |
PURPOSE:To obtain efficiently an oscillated output by controlling an oscillator where >=2 oscillating frequencies are set to be oscillated so as to generate a signal of a desired oscillating frequency. CONSTITUTION:When a main control signal C0 is given, the C0 becomes an operating level deciding signal of the oscillator 12 via a resistor 4. When sub- control signals C1, C2-CN are incoming in order, corresponding switch drive circuits 61, 62-6N are activated, their output is given to corresponding switches 221, 222-22N are their contacts (m) are thrown selectively to the position of contact (a). Then frequency variable switch drive circuits 241, 242-24N are activated, corresponding switches 181, 182-18N are closed, a frequency corresponding to the closed switch among the switches 181, 182-18N is generated at an output of the oscillator 12 and extracted from an output terminal 14. |
