Integrated MOS quartz oscillator with single crystal connector - gives frequency stability using series-resonance and two=stage amplification

摘要

The integrated quarz oscillator comprises two amplification stages (1, 2), a single connection pin (P) for an external crystal and a feedback capacitor (CG). The series-resonant crystal (Q) acts as source impedance for amplifier stage 1, which contains a single MOS transistor (T1), while stage 2 contains 2 MOS transistors acting as an inverter. The prod. of the 2 stage gains, V1 and V2 respectively, is greater than 1 at the oscillator resonance frequency and elsewhere less than ADVANTAGE - Redn. of circuit complexity and number of pins promotes reliability and compactness. Series resonance mode gives stable oscillator frequency and immunity to mfg. tolerances.