Article Details

Abstract

To improve frequency stability, temperature adaptability, and prevent oscillator lockout, this paper designs a temperature drift suppression oscillator circuit based on 0.18 μm BCD process. This circuit employs a novel feedback control system to convert the oscillation output frequency into a voltage signal and compare it with a preset reference voltage in real time, achieving precise adjustment of the oscillation frequency and significantly enhancing frequency stability. A Proportional to Absolute Temperature (PTAT) current is innovatively introduced into the ring oscillator, utilizing its temperature characteristics to dynamically adjust the current, effectively compensating for the decline of oscillation frequency in high-temperature environments and ensuring frequency consistency across the full temperature range. A unique anti-lockup mechanism is designed to preset a large current injection path in the default working state of the oscillator, injecting a large current at the moment of startup to quickly activate the oscillator, which improves the overall reliability of the system.

Keywords

oscillator; frequency-to-voltage conversion control; auxiliary temperature compensation; anti-lock-wake-up

References

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About the authors

Tao Liang (1982-), male, Han ethnicity, born in Nanchang, Jiangxi Province, is an intermediate engineer with a Master's degree in Engineering. His research direction is the design of mixed signal integrated circuits.