Switched Capacitor Voltage Converter

This project supports IoT development by reducing the power con- sumption and physical footprint of voltage converters. Our switched- capacitor IC design steps down an input of 1:0 - 1:4 V to 0:6 V for a decade of load current from 5 - 50A

Accurate and simple modeling of amplifier dc gain nonlinearity in switched-capacitor circuits

This paper presents an accurate and simple model for dc gain nonlinearity of operational amplifiers used in the switched-capacitor circuits such as the sigma-delta modulators. The proposed model can simply be used in the time-domain system level simulation of sigma-delta modulators to evaluate the effect of amplifier's dc gain nonlinearity on the overall linearity of the modulator as well as in the other switched- capacitor circuits as explored in the paper.Comisión Interministerial de Ciencia y Tecnología TIC2003-0235

Switched-Capacitor Programmable Sallen and Key Lowpass Filters

This thesis deals with a different approach to switched-capacitor filters than previously seen by the use of a Sallen and Key topology. It is shown that a Sallen and Key second-order topology approach to a switched-capacitor filter gives reasonable filter performance results, contrary to what the literature leads one to expect. It is also shown that the Sallen and Key second-order topology with modification to a third-order section with buffers results in a high performance switched-capacitor filter with fewer components than previous switched-capacitor filters. This results in fewer monolithic chip size requirements, reduced power requirements, and less cost. Higher order filters could be obtained by cascading either one of the second- or third-order switched-capacitor sections together. Desired filter Q values and cutoff frequencies are shown to be obtained by changing the capacitor ratios and clock frequencies, respectively

Optimal PWM control of switched-capacitor DC/DC power converters via model transformation and enhancing control techniques

Abstract—This paper presents an efficient and effective method for an optimal pulse width modulated (PWM) control of switched-capacitor DC/DC power converters. Optimal switching instants are determined based on minimizing the output ripple magnitude, the output leakage voltage and the sensitivity of the output load voltage with respect to both the input voltage and the load resistance. This optimal PWM control strategy has several advantages over conventional PWM control strategies: 1) It does not involve a linearization, so a large signal analysis is performed. 2) It guarantees the optimality. The problem is solved via both the model transformation and the optimal enhancing control techniques. A practical example of the PWM control of a switched-capacitor DC/DC power converter is presented

Reconfigurable Multiphase Switched Capacitor Converters Based on Non-Binary Numeral Systems: Ternary Case

Multiphase Switched Capacitor Converters (SCC) recently gained attention due to their ability to generate different voltage Target Ratios (TR). One of the reconfigurable multiphase SCC topologies is a binary one. For this SCC, the switched capacitor normalized voltage distribution is binary as the name implies and each capacitor represents a single bit. This paper suggests SCC topologies that are based on non-binary numeral systems – ternary, quaternary etc. The potential benefits of such SCC topologies compared with binary include reduced switched capacitor stored energy and equivalent resistance. The paper investigates into ternary SCC voltage TR set, possible balanced switching implementation and equivalent resistance calculation using charge flow balance analysis. Multiphase balanced switching allows for essential switched capacitor and peak-topeak output voltage ripple (or output filter capacitance) reduction