Howtosignalprocessing
- How to reduce frequency drift?
- What causes signal drift?
- How do you measure frequency drift?
- What is oscillator drift?
How to reduce frequency drift?
Various approaches are available for compensating for temperature to reduce drift. While temperature can be managed at the system level, such as using a fan to cool components when the ambient temperature rises, the most precise systems will utilize an oscillator that can compensate for temperature internally.
What causes signal drift?
Given the multiple causes of signal drift, the variation between vendors, scanners, and scanner environment, and factoring in the large range of diffusion MRI scan protocols used across studies and sites, it is important to investigate the extent of signal drift and the impact on analyses for each site or scanner.
How do you measure frequency drift?
The Frequency Drift Rate is calculated by comparing the measured drift in each 10 bit group and comparing it with the measured drift in each of the 2 adjacent 10 bit groups. The largest difference is taken as the measurement result.
What is oscillator drift?
Also called “frequency drift” this is an unintended offset of a voltage-controlled oscillator (VCO) from its nominal frequency — basically, the oscillator goes out of tune!
