High stability common collector crystal oscillator - has Zener diode stabilised supply in integrated circuit construction operating in megahertz band

摘要

The transistor crystal oscillator is intended to provide a high stability output in the MHz band from a low level supply. The design is intended to provide an extremely simple, cheap circuit lending itself to integrated circuit form. The transistor (1) may be pnp or npn and the supply 1.5 volts or less. The crystal (3) may be piezo or ferroelectric and is connected in series with a resistor (4) between the base and the emitter, the inherent capacity (6) of the junction providing the required coupling. The supply may be stabilised by a suitable parallel zener diode to within 2.0 m volts between -55 deg.C and 100 deg.C.