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Quartz crystal sine wave oscillator circuit

2016-08-30 14:44  
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Quartz crystal sine wave oscillator circuit
The picture shows the sine wave oscillator which is composed of the quartz crystal SJT and the gate A of the hex inverter IC CD4069.Compared with the ordinary RC phase-shift oscillator, the stability of crystal oscillator’s frequency can reach 10-5 or higher. This high index (The stability of the RC phase-shift oscillator’s frequency only can reach 10-2) can not be reached by the RC phase-shift oscillator. CMOS NAND gate and the negative feedback bias resistor R1 form the inverting amplifier circuit. Quartz crystal SJT, C1 and C1 form the 7c type positive feedback branch.