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One of the most important goals for this study is to reveal an effective way to develop systematically the state equations that define the analog circuits (linear, non-linear, timeinvariant etc.) with excess elements. These equations can be depicted in various forms, like symbolic form, numeric-symbolic form, numeric-normal form. At the beginning, we designed the calculation method and afterwards...
A graphical/numerical technique is presented for the extraction of roots (poles and zeros) of RC and RL circuits, where the roots lay on the real axis in the s-plane. The method constructs a corresponding LC circuit for the RC or RL circuit, and as demonstrated, all real axis roots are shifted to the jω axis, where the swiping-frequency signals exit. The process takes place in two steps: in the first...
This paper presents an analog implementation of a digitally reprogrammable control for fixed frequency switching power converters. It is a recursive discrete time filter based on switched capacitor delay cells. The proposed circuit allows to synthesize different transfer functions in order to cope with the modifications in dynamics of power converters due to inputs or parameters variations. A prototype...
Recently, an improved Z-source inverter topology has been proposed to reduce the capacitor voltage stress and limit the inrush current at startup in traditional Z-source inverter. The dynamic modeling and transfer functions are essential to design control schemes for this new topology. This paper presents the small signal modeling and mathematical analysis of the improved Z-source inverter. In particular,...
Presented is a novel source-follower-based (SFB) bi-quad cell suitable for realizing continuous-time zero-pole type filters. Unlike the conventional SFB bi-quad cells that can only realize complex poles, additional complex zeros can be synthesized in the proposed one, by adding two feedforward capacitors. A 4th-order Chebyshev II fully differential low-pass filter prototype was fabricated in a 0.18-μm...
The generalized method of time and transfer constants is introduced. It can be used to determine the transfer function to the desired level of accuracy in terms of time and transfer constants of first-order systems using exclusively low frequency calculations. This method can be used to determine the poles and zeros of circuits with both inductors and capacitors. An inductive proof of this generalized...
This paper proposes a low-voltage, low-power, two-stage operational transconductance amplifier (OTA) for driving large capacitive loads. The embedded capacitor-multiplier compensation mechanism facilitates using a very small Miller capacitor which generates widely separated left-half-plane (LHP) poles without introducing a right-half-plane (RHP) zero. Besides, it provides a feedforward signal path...
Traditional design of low-dropout regulators offer the use of metal-insulator-metal (MIM) compensation capacitors to prevent instability in the absence of load capacitor with equivalent series resistance (ESR). In addition to area efficiency achieved by replacing these capacitors with MOS transistors, the location of implanted transfer function poles and zeros are adaptively changed according to the...
In recent years, the development of new technologies is requiring power supplies with wide conversion voltages. An alternative solution is to use a quadratic boost converter with a single active switch. This converter has two LC filters; thus, it will exhibit fourth-order characteristic dynamics. In this paper, switched linear, nonlinear averaged and linear averaged models are developed for the aforementioned...
This paper presents a direct peak dc-link boost voltage PID-like fuzzy controller in Z-source inverter. With this technique a constant peak dc-link voltage can be achieved with an excellent transient performance which enhances the rejection of disturbance, including the input voltage and load current variation, and solves the problem of the local dynamic output feedback stabilization of the serious...
A new methodology for the design of two-stage cascode-compensated operational amplifiers (opamps) is proposed in this paper. It specifies proper open-loop circuit-level parameters regarding the desired bandwidth and closed-loop stability. As the effect of the zeros of the open-loop transfer function has been taken into account, the presented methodology becomes more accurate than previous methodologies...
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