A specific LSIC intended for synthesizer-type DTCXO
Anatoly V. Kosykh · 1996
Thermocompensated crystal oscillators are widely used in cases when high frequency stability, low power consumption and short time of coming into readiness are needed. Digital methods of frequency compensation provide the highest frequency stability parameters. Popular as they are digital thermocompensated oscillators have the stability that usually does not surpass /spl plusmn/5/spl times/10/sup -7/ in a wide temperature interval. Much higher frequency stability can be achieved in a DTCXO of a synthesizer type (DSTCXO). Several tens of microcircuit packages would be needed in order to construct a DSTCXO using discrete components. With the purpose of DSTCXO dimensions minimization a specific LSIC has been developed comprising nearly all oscillator elements. The microcircuit was intended for interaction with frequency sensor of temperature. The resolution of synthesizer is 10 ppb. When a double mode quartz oscillator is used temperature stability comes as high as /spl plusmn/3 ppb.