By Topic

On-Chip Digital Inductor Current Sensor for Monolithic Digitally Controlled DC-DC Converter

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Man Pun Chan ; Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong ; Philip K. T. Mok

Conventionally, inductor current is sensed and quantized before it can be used by digitally controlled DC-DC converters. These are intuitively done by using two separated functional blocks-an analog current sensor and an ADC. A few research works have investigated other ways of obtaining the inductor current information in the digital domain. This paper proposes an on-chip digital inductor current sensor that combines both the inductor current-sensing and quantization into a single functional block. In this way, the redundancies found in the conventional approach can be reduced and optimizations can be made to save chip area and power consumption. An 8-bit digital inductor current sensor has been designed and fabricated with a UMC 0.13 μm CMOS process. The measurement results show that the digital sensor can provide digital inductor current information with a conversion time of 225 ns. This can be used by a buck converter with a switching frequency up to 4 MHz. The digital sensor has linear and monotonic input-output transfer curve properties with an LSB of 6.79 mA. It consumes current of 700 μA at 1.2 V supply voltage.

Published in:

IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:60 ,  Issue: 5 )