| 摘要 |
PCT No. PCT/SE86/00361 Sec. 371 Date Apr. 10, 1987 Sec. 102(e) Date Apr. 10, 1987 PCT Filed Aug. 12, 1986 PCT Pub. No. WO87/01534 PCT Pub. Date Mar. 12, 1987.A phase changer includes a simple non-regulatable XO crystal oscillator (25) with a delay circuit (23) connected thereto for providing delays which time is changing linear on the average. A positive or negative, respectively, degree of delay change results in that the circuit sends a signal having a frequency lower or higher, respectively, than the oscillator frequency. The phase changer further includes a calculating unit (24) which compares in time stages a nominal frequency signal with the delay circuit output signal, and which calculates in time stages digital signals for controlling the delay circuit. Due to a relevant comparison result, there are generated the relevant control signals which determine a relevant degree of delay change, resulting in that the output signal comes into phase with the nominal frequency signal. |
