High Stability Temperature Compensated Crystal Oscillator Study.

摘要

A miniature high-stability temperature-compensated crystal oscillator (HSTCXO) has been developed with new features for eventual use in SSB communications equipment. These new features are a wider temperature range for the same temperature stability (+ or - 5 pp to 10 the 8th power from -46 to +85 C), single supply (10 + or - 0.5 V), low power consumption (less than 100 mW), a CMOS compatible output (10 V square wave) and small size, 2.75 in X 1.5 in X 0.5 in (6.98 cm X 3.81 cm X 1.27 cm). Other important features of the HSTCXO are a 50-ohm output (0.125 V rms), insensitivity to load variations and voltage variations ( + or - 5 pp 10 to the 9th power), and fast warmup (1 pp 10 to the 8th power of final frequency in 1 minute). The TCXO uses a conventional analog thermistor network of coarse compensation and a CMOS digital fine correction systems with a programmable memory for fine compensation. A computer data interpolation method is used to minimize the required number of data points for fine correction. (Author)