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https://hdl.handle.net/2142/100045
Description
Title
Temperature compensation in CMOS ring oscillators
Author(s)
Wasowicz, Alec
Contributor(s)
Hanumolu, Pavan K.
Issue Date
2018-05
Keyword(s)
Ring Oscillator
Temperature
Feedback
Compensation
Abstract
Increasing the utility of integrated ring oscillators requires that several sources of error be
addressed. These include temperature, voltage, and process variations. A solution to these
would allow for higher performance PLLs. This project addresses the temperature dependence
of the frequency. Active elements dominate the temperature variation in the circuit. To
compensate for this, a feedback loop was created to correct the control current of the oscillator
across temperature. The feedback loop uses passive poles to introduce a delay into the signal
path. The phase between this delayed path and the original signal depends on the frequency of
the signal. This allows the oscillator to be tuned. This method was implemented in 65 nm CMOS
for a 64 MHz ring oscillator.
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