Abstract This paper’s purpose is to evaluate empirical and theoretical perspectives in Sales Operations Planning (S&OP). The methodology consists of a systematic literature review, analysing 292 publications from academics practitioners. results reveal that the evidence has been initially obtained by practitioners subsequently acquired with growing interest recent years. Three main research...

It would be desirable if computers could solve problems without the need for a human to write the detailed programmatic steps. That is, it would be desirable to have a domain-independent automatic programming technique in which "What You Want Is What You Get" ("WYWIWYG" – pronounced "wow-eee-wig"). Genetic programming is such a technique. This paper surveys three recent examples of problems (on...

Filter design takes one of two approaches: passive or active. Passive designs combine resistors, capacitors and inductors to perform specific frequency filtering in applications where precision is less important than mass producibility. For very high frequency applications, a passive approach is quite often the only way to go. Active filters combine op amps and discrete transistors, primarily w...

This paper presents a multistage amplifier for low-voltage applications (<2 V). The amplifier consists of simple (noncascode) low gain stages and is stabilized using a nested transconductance-capacitance compensation (NGCC) scheme. The resulting topology is similar to the well known nested Miller compensation (NMC) multistage amplifier, except that the proposed topology contains extra Gm feedfo...

A method of analyzing switched-capacitor (SC) filters which incorporates a single-pole model of the operational amplifiers (op amp’s) is presented. Closed-form algebraic expressions for filter transfer functions in the z-domain are obtained which are computationally more efficient than time-domain methods. The necessity for including a frequency dependent model of the op amp rather than the com...

This paper describes a CMOS analog baseband circuits for directconversion receiver of5GHz IEEE 802.11a. The analog baseband consists of I/Q signal paths which have channel selection filter, programmable gain amplifier (PGA). An active-RC channel selection filter for WLAN is described whose cut-off frequency is tunable from 6MHz to 20MHz. For high linearity, the PGA is constructed with op-amp an...

Abstruct -Generation of two integer loop filter structures using operational Transconductance Amplifiers (OTA's) and Capicitors (TAC) is presented. A direct block diagram approach is employed to generate the TAC filter structures. The basic filter building blocks consist of a lossless integrator, lossy integrators and three types of summers. They are implemented using OTA's as the active compon...

This paper proposes an architecture of 3 rd order SDM(Sigma-Delta Modulator) with delayed feedforward path in order to reduce power consumption and area. The proposed SDM improve the architecture of conventional 3 rd order SDM which consists of two integrators. In the proposed architecture, the coefficient values of the first stage are doubled by inserting the delayed feed-forward path into the...

An automatic synthesis tool for CMOS op amps (OPASYN) has been developed. The program starts from one of a number of op amp circuits and proceeds to optimize various device sizes and bias currents to meet a given set of design specifications. Because it uses analytic circuit models in its inner optimization loop, it can search efficiently through a large part of the possible solution space. The...

This paper describes the design of a high-speed CMOS sampleand-hold (S/H) circuit for pipelined analog-to-digital converters (ADCs). This S/H circuit consists of a switched-capacitor (SC) amplifier and a comparator to generate the mixed-mode sampled output data, which are represented both in analog and digital forms. The mixed-mode sampling technique reduces the operational amplifier (op amp) o...