| 摘要 |
<p>The invention relates to quartz oscillators which are frequency locked. According to the invention the quartz oscillator (3) is frequency/phase locked by a first loop comprising a comparator (7) and an operational amplifier (5) whose output voltage controls a "Varicap" diode connected into the oscillating circuit of the oscillator (3). A second locking loop comprising the operational amplifier (6) and the heating resistor (8) which is thermally coupled to the quartz of the oscillator (3) allows the frequency/phase of the quartz to be modified by affecting its temperature. The invention is applicable to any device in which a quartz oscillator is to be frequency shifted over a relatively sizable range so as to ensure locking onto another reference oscillator. <IMAGE></p> |
