Direct Digital Synthesizers: Theory, Design and Applica- tions

Sine Approximation for Direct Digital Frequency Synthesizers and Function Generators

There are several compression methods for phase to amplitude converter for sine function. In this paper, the linear and parabolic approximation of equi-section division utilizing the symmetry property and amplitude approximation of a sinusoidal waveform for direct digital frequency synthesizer (DDS) and also for other waveform applications, e.g. function generators and telecommunication devices...

Digital Terrain Analysis: Data Source, Resolution and Applica- Tions for Modeling Physical Processes in Agroecosystems Analisi Digitale Del Territorio: Dati, Risoluzione Ed Applicazioni per La Modellazione Di Processi Fisici in Agroecosistemi

Terrain analysis is the quantitative analysis of topographic surfaces. Most attempts at modeling landscapes have been unsuccessful because the landscape was either looked at in little details or the landscape was considered in two dimensions. The purpose of a digital terrain system is the digital representation of terrain so that environmental problem like soil erosion may be approached accurat...

A HIGH-PERFORMANCE SIGMA-DELTA ADC FOR ADSL APPLICA- TIONS IN 0.35μm CMOS DIGITAL TECHNOLOGY

We present a Sigma-Delta modulator designed for ADSL applications in a 0.35μm CMOS pure digital technology. It employs a 4th-order 3-stage cascade architecture including both single-bit and multi-bit quantizers with programmable resolution, which allows us to use only 16 oversampling ratio. Especial emphasis is placed on technology issues, namely: poor analog performance and substrate coupling....

Commercial off the Shelf Direct Digital Synthesizers for Digital Array

Dual-band Folded Monopole Antenna with Slotted Ground Plane for Wlan Applica- Tions

Study of a novel design of dual-band folded antenna with an L-shaped slot on the ground plane has been proposed for wireless local area network (WLAN) applications. The proposed antenna occupies a low profile above the ground plane. This characteristic makes it suitable for laptop PC applications. The proposed antenna can provide two impedance bands at 2.4 and 5.2/5.8 GHz, which satisfies WLAN ...