Feasibility Study of Applying GIC to DC-DC Converter Feedback Compensation Circuit
Date Issued
2005
Date
2005
Author(s)
Pan, Tian-Fu
DOI
zh-TW
Abstract
Low- voltage low-power converters are used extensively in many battery-powered hand-held devices. In this type of application, the converter switching frequency is normally operated at frequencies higher than two to three hundred kilohertz. At such high frequencies, the converter feedback control compensation usually requires using capacitors of relatively small values. Integration of such capacitors into the converter controller chip becomes a viable option under such conditions, although these capacitors still occupy too much chip area.
In this thesis, investigation was conducted to evaluate the feasibility of using Generalized Impedance Converter (GIC) concept to reduce the chip area of a compensating capacitor for DC/DC converter applications. Several configurations of GIC were studied using simulations and discrete component experimentations. Under ideal component condition, the circuits perform as well as the theory predicts. However, when a non-idea operational amplifier was used in the simulations, characteristics of the GIC capacitors deviate from desirable features. Under certain conditions, GIC seems to work as a capacitor in low frequency area. This has been demonstrated by the discrete experimentation. But many questions are still unanswered. And warrant further investigation.
Subjects
阻抗轉換器
回授補償電路
轉導放大器
GIC (Generalized Impedance Converter)
Feedback Compensation Circuit
OTA(Operational Transconductance Amplifier)
Type
thesis
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