RC time-constant-based reference oscillators, CMOS process
Date of Ingest
2024-10-15T10:44:01-05:00
Abstract
Generation of temperature invariant reference clocks on-chip may eliminate the need for bulky off-chip temperature compensated crystal oscillators. RC time-constant-based reference oscillators are well-suited for this role since they occupy a small area, consume little power, and can be easily integrated in any standard CMOS process. However, their performance is sensitive to the operating temperature. Using novel architectures discussed in the literature, we present a complete design of an RC-time constant-based reference oscillator with active temperature calibration achieved via two-point trimming of the circuit post-fabrication. The oscillator is designed to achieve a 100 MHz output frequency with less than 1000 ppm frequency variation from-30◦C to 90◦C.
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