Genetic programming was used to evolve both the topology and sizing (numerical values) for each component of a low-distortion, low-bias 60 decibel (1000-to-1) amplifier with good frequency generalization.

This paper investigates the design curves of class E amplifier with nonlinear capacitance for any output Q and finite dc-feed inductance. The important results are; 1) the capacitance nonlinearity strongly affects the design parameters for low Q, 2) the value of dc-feed inductance is hardly affected by the capacitance nonlinearity, and 3) the input voltage is an important parameter to design cl...

The implementation of currentfeedback op-amps (CFB op-amps) relies on the use of a semiconductor process with complementary device structures for class AB operation of the input and output stages. Thus, CMOS technology is an obvious candidate. However, commercial CFB opamps are all realized in bipolar processes. In this paper we identify some of the problems related to the application of CMOS t...

The need for high speed, wideband amplifiers is the driving force behind the development of the Current Feedback Amplifier (CFA). The CFA has significant advantages over conventional amplifiers in terms of slew rate performance and inherently wide bandwidth. This paper provides a review of the theory and design of current feedback amplifiers.

The paper deals with aim to design an OPAMP of Class AB to achieve high power efficiency and slew rate. To have high slew rate the focus of the proposed work as high slew rate contributes to the fast and dynamic output response. Power efficiency is driving factor from MOORE’S law. A Push pull OPAMP with current replicating branch is used to achieve symmetrical wave with high slew rate. Adaptive...

A new class AB differential stage that operates with a single supply voltage of less than two transistor threshold voltages is introduced. This circuit has utilization in high slew rate one stage op-amps, two stage op-amps with class AB input and output stages and linear transconductors. The circuit was verified with simulations and experimentally. It it is shown to have lower voltage supply re...

This paper demonstrates that a design for a low-distortion highgain 96 decibel (64,860 -to-1) operational amplifier (including both circuit topology and component sizing) can be evolved using genetic programming.

AbstractA BiCMOS rail-to-rail operational amplifier capable of operating from supply voltages as low as 1.W is presented. A new technique of achieving a rail-to-rail input common mode range us'ing a bipolar input stage is developed. The new technique avoids the use of complementary pairs at the input and thus avoids complicated schemes for monitoring the constant g,?, . The resulting variation ...

In this paper, we address three issues related to the design of opamps for oversampled converters: the theoretical minimum-power bound for an ideal opamp, the best opamp choice in terms of power dissipation, and the best design strategy to reduce power dissipation. To be able to do so, we develop a model that captures the dynamics of the integrator inside the modulator. Based on this model, pow...

Abstract—This paper presents the design of a third-order Σ∆ modulator targeted for WCDMA applications. The architecture uses two operational amplifiers and distributed fully digital feed-forward paths to minimize the output swing of op-amps. Simulation results show that first and second integrator output swings are reduced by 88% and 75%, respectively. Post-layout simulation results of the modu...