TEMPERATURE COMPENSATED OSCILLATORS USING SWITCHED RESISTORS
Han, Mingyuan
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https://hdl.handle.net/2142/114943
Description
Title
TEMPERATURE COMPENSATED OSCILLATORS USING SWITCHED RESISTORS
Author(s)
Han, Mingyuan
Issue Date
2022-05
Keyword(s)
Ring Oscillator, Temperature Compensation, Delta-Sigma Modulator, Clock Frequency
Abstract
High-quality, low-noise, power-efficient clock generators are very rare. This thesis explores
different ways to generate such clocks. High-frequency crystal oscillators (XO) are very
rare and fragile. Compared to XOs, on-chip oscillators will take up a much smaller area
but are very vulnerable to temperature and process variation. Therefore, a temperature
compensated oscillator architecture is introduced in this thesis. This architecture utilizes
two opposite temperature coefficient resistors and two-point trimming to make the output
frequency constant throughout out the temperature range. This chip is fabricated in the
TSMC 65nm process. The temperature compensated oscillator is aiming to achieve
1000ppm as temperature varies from −40◦ C to 90◦C.
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