A Current Average Control Method for Transient-Ripple Reduction in Frequency Hopping DC-DC Converters
Date Issued
2011
Date
2011
Author(s)
Tai, Jia-Nan
Abstract
This thesis presents an inductor current average control method for transient-ripple reduction in frequency hopping DC-DC converters and is implemented in a standard 0.35-μm 2P4M 3.3V/5V Mixed Signal CMOS process. When using the frequency-hopping technique, there is transient ripple on the output voltage due to the difference of inductor current between two different frequencies. This thesis proposes a method which predicts the average inductor current and inserts a calculated-width pulse between two frequencies to reduce the transient ripple on the output voltage.
Measurement results are performed with the switching frequency of this chip operating between 0.88 MHz and 3.4 MHz. The transient ripple on the output voltage is reduced by 88% and the undesired spur is reduced by 14.1 dB. The frequency-hopping technique achieves 23.55 dB reduction of the EMI spur magnitude. The maximum power efficiency achieved 90%. The chip occupied 2.126 mm2, and the other detailed measurements are included in this thesis.
Subjects
DC-DC converter
spread spectrum
frequency hopping
File(s)![Thumbnail Image]()
Loading...
Name
ntu-100-R97943143-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):8f4fa650cdbb8209b2b3b79b171e4a70