Switched Capacitor Compensation of Supply Distortion in Class-D Amplifiers

Capacitor Mismatch Compensation for the Quasi-Passive Switched-Capacitor DAC

A method to eliminate the effect of capacitor mismatch for a switched-capacitor DAC is described. The method consists of two elements. The first element is the use of a compensating switching algorithm, which can eliminate the effect of capacitor mismatch only for some digital input values. The second element is that each digital word is written as the sum of two other words for which the capac...

Performance of Switched-Capacitor Circuits Due to Finite Gain Amplifiers

One of the distinct advantages of switched-capacitor (SC) circuits is that they are compatible with existing CMOS technology. Hence, they are among the most popular analog building blocks. However, the standard design methodology assumes the use of infinite gain and infinite bandwidth operational amplifiers. The gain limitation of operational amplifiers introduces finite gain error. Section 2 o...

THD Analysis in Closed-Loop Analog PWM Class-D Amplifiers

In this paper, we investigate the parameters affecting Total Harmonic Distortion (THD) and Power Supply Rejection Ratio (PSRR) in PWM Class D Amplifiers (CDAs) on the basis of linear models with feedback. From our mathematical analysis, we show that the THD of a PWM Class D amplifier with feedback can be improved by increasing the gain of the integrator through adding another amplifier at the o...

Low-Voltage Fully Differential CMOS Switched-Capacitor Amplifiers

Low-distortion switched-capacitor event-driven analogue to-digital converter

Introduction: Emerging ultra-low-power applications such as wireless sensor networks and wireless body area networks require the integration of very efficient signal processing techniques, specifically in analogueto-digital conversion. General-purpose ADCs that rely on Nyquist theory result in unnecessary sampling, and dissipate excessive power within the ADC and subsequent digital signal proce...