| 摘要 |
An oscillator circuit having a first programmable divider for obtaining a reference signal by dividing the frequency of an oscillation signal of a piezoelectric resonator by a frequency dividing number, M. A PLL circuit using the reference signal as input thereto to obtain a multiplied signal, the multiplied signal being formed by multiplying the input signal by a second frequency dividing number N for a second programmable divider provided in a feedback circuit. A third programmable divider capable of dividing the frequency of the multiplied signal by a third frequency dividing number X and outputting the frequency-divided signal. The frequency dividing numbers M, N, and X can be set to values independent of each other. Therefore, innumerable combinations of the frequency dividing numbers M, N, and X can be used and the number of frequencies producible by one oscillator can be largely increased by enabling selection of any suitable one of such combinations.
|
