Voltage controlled S-TCXO´s employing NS-GT cut quartz crystal resonators

The authors describe the frequency temperature behavior of S-TCXOs (self-temperature compensated crystal oscillators) using a novel-shape GT-cut quartz crystal resonator (NS-GT cut resonator) controlled by voltage. An attempt is made to clarify the frequency temperature behavior of voltage-controlled S-TCXO´s using a NS-GT cut resonator, and to show the aging characteristics of these devices for a period of about two years and three months. The voltage-controlled S-TCXO´s using a NS-GT cut resonator are successfully obtained with a frequency deviation within +/-4 × 10^-9 directly after voltage control in a wide temperature range of -30 to +85°C. The frequency shift of eight samples is from 0.061 ppm to 0.146 ppm (mean:0.098 ppm) for about one year and three months after preaging for about one year