Personnel

FICs - Prof. Philip K. T. Mok and Prof. Wing-Hung Ki

Description

Nowadays, not only are the size and weight of the power convertersfor battery operated portable equipment important but also the efficiencyof the power converters. High efficiency is mandatory in order to lengtheneach operation cycle of the rechargeable battery and to reduce the wastedpower that has to be dissipated within the power converters. The high efficiencyswitching mode power converters (SMPCs) are more suitable for such purposesthan the linear regulators. However, the switching noise generated fromthese SMPCs is always problematic for highly sensitive telecommunicationequipment such as cellular phone and global positioning system units.

The objective of this project is to design a compact high-efficiencylow-noise SMPC for the battery operated portable wireless telecommunicationequipment. In order to deal with the switching noise problem, this projectis concentrated in four areas:

1. to design a pulse width modulated (PWM)SMPC in order to easily predict the frequency of the switching noise generated from the SMPC;
2. to integrate the pass transistor of the LDOand the power switches of the SMPC into a single IC in order to improvethe sensing and close loop control of the regulator and to reduce the overallsize and weight of the converter;
3. to study the compensation techniqueused in the LDO and to develop a systematic way to compensate the regulator.

Source: RGC | ITF