Analýza a modelování moderních obvodů nábojových pump

Abstract

Dizertační práce se zabývá návrhem křížově vázané nábojové pumpy, jež se používá pro napájení nízkopříkonových obvodů na čipu. Čtenář je seznámen s netradičním přístupem k popisu diskrétně pracujících analogových soustav vycházející z teorie nelineárních systémů. V úvodní části jsou shrnuty základní poznatky v oblasti SC obvodů včetně vlastností základních struktur dvoufázových nábojových pump.

The thesis presents the design process of the cross-coupled charge pump on the circuit-level hardware realization, which is used for supplying low current consumption peripherals on the chip. The unconventional approach to the discrete-time analogue circuit description arising from non-linear systems theory is offered. Design aspects of the SC circuits are firstly explained, including the analysis of the basic topologies of two-phase charge pumps. The main part deals with the steps of the cross-coupled charge pump design algorithm. Synthesis procedure includes the design of the pump functional blocks based on BSIM equations of MOSFET for long channel technology process and application of the pump stage complex model for estimation of the number of pump stages via state-space model description and using of the interpolation polynomial functions in the algorithm. Designers are provided two available solutions satisfying particularly two criteria in terms of the circuit and economic optimization-high efficient, i.e. pump maximal voltage gain and an area-efficient charge pump. The whole procedure is summarized in the practical example, including the comparison between calculated and simulation results. Added functions of the design environment are explained, inclusive of the designed pump netlist generating for professional design environment Mentor Graphics including the real models of components that are available in library MGC Design Kit. In addition, the complex model allows the inclusion effects of higher-levels and is also applicable to other MOSFET technology process, as PSP or EKV. The main benefit is the charge pump synthesis step by step synthesis without long time-consuming optimization process.