IC-compatible crystal oscillator

Resistors Rl and R2 temperature-stabilize the NAND gates; they also ensure that the gates are in a linear region for starting. Capacitor CI is a dc block; it must have less than Vw ohm impedance at the operating frequency. The crystal runs in a series-resonant mode. Its series resistance must be low; AT-cut crystals for the 1- to 10-MHz range work well. The output waveshape has nearly a 50% duty cycle, with chip-limited rise times.
IC-compatible crystal oscillator - schematic

The circuit starts well from 0° to 70°C.


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