This work describes a 12-bit 100 MS/s 0.13 μm CMOS three-stage pipeline ADC with various circuit design techniques to reduce power and die area. Digitally controlled timing delay and gatebootstrapping circuits improve the linearity and sampling time mismatch of the SHA-free input network composed of an MDAC and a FLASH ADC. A single two-stage switched op-amp is shared between adjacent MDACs wit...

This paper presents a novel design methodology for optimizing the performance of CMOS op-amp topologies by using Multi-Objective optimization Methodology. This methodology is used to find the optimal transistor dimensions in order to acquire operational amplifier performances for analog and mixed signal circuit applications. The goal is to automatically determine the device size in order to mee...

1. Introduction A system on chip (SoC), which has various functions on a LSI, has been developed for a variety of applications by the submicron technologies. Especially, implantable and/or attachable neural sensor chips, which are implemented by the SoC, attract a lot of interest [1]. The neural sensor chip, which includes with a low-noise amplifier, analog-to-digital converter (ADC), transceiv...

This paper discusses the use of a low gain amplifier and a passive switched-capacitor (SC) network to enable the SC integrator function. The method is applied to a deltasigma modulator to achieve high resolution as proved by the 65-nm CMOS technology test vehicle. Compared with the conventional operational amplifier (op-amp)-based SC integrator, this solution utilizes a low-gain open-loop ampli...

AN1228 INTRODUCTION This application note covers the essential background information and design theory needed to design low noise, precision op amp circuits. The focus is on simple, results oriented methods and approximations useful for circuits with a low-pass response. The material will be of interest to engineers who design op amps circuits which need better signal-to-noise ratio (SNR), and...

4.3 Precision rectifier circuits 4.14 Triangular wave generator using op-amp application is in the now famous uA741 operational amplifier, and Widlar used. is the supply voltage and the opamp is powered by +V_(/text(s)) and -V_(/text(s)).) By using an RC network to add slow negative feedback to the inverting Schmitt trigger, a relaxation oscillator is formed. Precision rectifier, OpAmp Precisio...

Absfracf—A study is made of the integrated circuit operational amplifier (IC op amp) to explain details of its behavior in a simplified and understandable manner. Included are analyses of thermal feedback effects on gain, basic relationships for bandwidth and slew rate, and a discussion of pole-splitting frequency compensation. Sources of second-order bandlimiting in the amplifier are also iden...

Chua's circuit is a simple electronic network which exhibits a variety of bifurcation phenomena and attractors. The circuit consists of two capacitors, an inductor, a linear resistor, and a nonlinear resistor. This paper describes the design methodology for a robust practical op amp implementation of Chua's circuit. In addition, we present experimental results and SPICE simulations for a workin...

Operational amplifiers have traditionally been operated using dual power supplies–often +15 volts and -15 volts. However, that is not a requirement. An op-amp will operate with any upper and lower power supply voltage provided the voltage across the amplifier is less than maximum ratings and voltages at the terminals are within the specification range relative to the power supply voltages. This...