The performance of switched-capacitor circuits depends highly on the op-amp specifications. In conventional designs, trade-offs in speed, noise, and settling accuracy make it difficult to implement power-efficient switched-capacitor circuits. The problem originates from the inverse relationship between the feedback factor and the signal gain. This thesis proposes the virtual ground reference bu...

Nowadays, sensors and Integrated Circuits (ICs) are present in all kind of applications, ranging from computers to portable devices, from automotive to biomedical applications. The demand on low power ICs is also increasing each year. But with CMOS technology scaling, it becomes difficult to design analog circuits such as high gain Operational Amplifiers (op-amps). In this work, a Switched-Capa...

At high speeds and high resolution, the Pipeline ADCs are becoming popular. The options of different stage resolutions in Pipelined ADCs and their effect on speed, power dissipation, linearity and area are discussed in this paper. The basic building blocks viz. Op-Amp Sample and Hold circuit, sub converter, D/A Converter and residue amplifier used in every stage is assumed to be identical. The ...

The design of a simple, fast and accurate sample and hold circuit using a switched op-amp configuration is presented. The unique characteristic of this sample and hold circuit is the cancellation of charge injection effects due to the symmetrical output switched transistors circuit and device configuration. The clock-feed through effect is also reduced by applying the effect of clock pulses to ...

This paper discusses the electrical properties of the complementary heterojunction field-effect transistor (CHFET) at 4 K, induding the gate leakage current, the subthreshold transconductance, and the input-referred noise voltage. The CHFET is a GaAs-based transistor analogous in structure and operation to silicon CMOS, and is being explored for possible application in readout electronics opera...

Nullor elements have applications not only in analog behaviour modeling but also in analog circuit design and analysis. Fixator-norator pair, the emerging tool in analog design is a combination of a nullor and sources. A method for the realization of fixator-norator pair is discussed in this paper. Application of fixator-norator pair into a circuit makes it possible to perform the AC and DC des...

This paper presents a 14-bit cyclic-pipelined Analog to digital converter (ADC) running at 1 MS/s. The architecture is based on a 1.5-bit per stage structure utilizing digital correction for each stage. The ADC consists of two 1.5-bit stages, one shift register delay line, and digital error correction logic. Inside each 1.5-bit stage, there is one gain-boosting op-amp and two comparators. The A...

A second order switched capacitor sigma-delta modulator operating at a supply voltage of 1 V is presented. This low supply voltage restricts the gate overdrive voltage available for switching transistors. The design relies on the elimination of critical switches by using a modified switched op amp for the integrator and novel switched half-supply and reference voltage generators. The design has...

This brief describes a new low-power fully differential second-order continuous-time low-pass filter for use at video frequencies. The filter uses a single active device in combination with MOSFET resistors and grounded capacitors to achieve very low-power consumption and large dynamic range. The ideal integrator is realized using an internally compensated op-amp consisting of only current mirr...