A high-speed and high-accuracy continuous-time common-mode feedback block (CMFB) is presented. To satisfy speed and accuracy requirements, some modi ̄cations have been applied on di®erential di®erence ampli ̄er (DDA) CMFB circuit. The proposed method is applied to a folded cascode op-amp with power supply of 3.3V. In order to verify the proposed circuit, simulations are done in 0.35 m standard CM...

In this paper a very low-noise low-power correlated double sampled integrator has been presented. For attenuating the sampling thermal noise, two large capacitors are well incorporated in the integrator with no using large sampling and integrating capacitors that are necessary in ordinary integrators. The integrator is used in the front-end of a 24 bit, forth-order single-loop single-bit Delta-...

Pipeline ADCs are becoming popular at high speeds and with high resolution. This paper discusses the options of number of bits/stage conversion techniques in pipelined ADCs and their effect on Area, Speed, Power Dissipation and Linearity. The basic building blocks like op-amp, Sample and Hold Circuit, sub converter, DAC, Residue Amplifier used in every stage is assumed to be identical. The sub ...

An operational amplifier designcd with O.35um CMOS teehnology is prcsented. All the transistors are realized with minimum or near-minimum ehannel length. As thc short ehannel length causcs performance degradation, a proper operational amplifier structure is sclected to compensate the performance degradation. The op amp is designed to meet the requirement of high-speed high-resolution sigma delt...

—A 10-bit, 100 Ms/s switched capacitor pipeline A/D converter has been implemented in 0.25um CMOS in the 1.5-bit/stage architecture. Simulations results indicate 6.7 effective bits and max INL and DNL of 0.708 and 0.298 LSB, respectively. The design features a fully differential signal path and implements sub-ADC sections using a recently developed switched capacitor technique. Additionally, di...

Transimpedance or current feedback amplifiers are still relatively new to audio applications, since they are pri­ marily designed for video circuits. While the AD846 (an early high-per­ formance example) was successfully used in TAA,1 transimpedance amps may not be completely familiar de­ vices (The AD846 data sheet contains a detailed discussion of transimped­ ance amplifier theory). Interesti...

In earlier Fault Analysis (FA) has been exploited for several aspects of analog testing. These include, test development, DfT schemes qualification and fault grading. In present, I testing has become a widely DDQ accepted defect detection technique in CMOS ICs.In this paper we described I testing technique for DDQ analyzing physical faults. A two stage CMOS opamp is taken as Circuit Under Test ...

The dual slope integrating analog to digital converter (ADC) is an efficient one for wireless transmission of ECG signals. Normally the dual slope ADCs are used for high resolution applications and the accuracy is very high. The main advantage of the ADC design is its high speed with low power. The dual slope ADC consists of integrator, comparator and a ten bit binary counter. To design integra...

A wide-range differential difference operational floating amplifier (DDOFA) is introduced. The DDOFA is a new block useful for continuous-time analog signal processing. The DDOFA is realized using a differential difference transconductor with large signal handling capability and a single input differential output current op-amp. The DDOFA forces two differential voltages to the same value and p...

This paper proposes a module of a high gain and high swing 2-stage amplifier. It is suitable for building a general operational amplifier in a modular fashion with various optional performances. The proposed module alone offers opened-loop voltage gain up to 124 dB and GBW of 10 MHz without loading conditions. To assemble a 124 dB voltage gain operational amplifier with load driving capacity of...