A new digitally temperature compensated crystal oscillator for amobile telephone system

摘要

A detailed description is given of the DTCXO designed for mobiletelephone system applications for which it is essential to have anarrower channel spacing. The authors have used a polynomialinterpolation technique to achieve a DTCXO with a highfrequency-temperature stability within ±0.3 p.p.m. The compact (4cm3), low-power-consumption (15 mW) DTCXO has been developedby using a flat-packaged CMOS gate array in the circuit of the digitalunit