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Software & CAD

Design of a Predistorter Controlling Individual Orders of Intermodulation Using a New Harmonic Generator

A new type of predistortion linearizer is presented which uses individual orders of intermodulation to linearize a power amplifier. This new predistortion linearizer has two harmonic generators, each consisting of four diodes biased independently. Sinc...
In multi-carrier power amplifiers, a feedforward technique is generally adopted due to its extremely linear and broadband characteristics. 1 However, the feedforward technique requires large circuits and is expensive because of its complexity. It uses two cancellation paths, and delay lines are inserted in each path to adjust the...
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A Novel Adaptive Feedforward Amplifier Using an Analog Controller

A novel adaptive design for a feedforward amplifier linearizer with an analog controller is proposed in this article. Compared with previous adaptive linearizing methods, this new design does not require any pilot signal or intentional signal distortio...
For the third-generation (3G) mobile radio standards, a very high linearity transmitter that can support high crest factor signals is necessary. High linearity and high efficiency are critical issues in amplifier design. In fact, as the power amplifier operates close to the saturation region where both high efficiency and...
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A Voltage-controlled PIN Diode Attenuator Using an Accurate PIN Diode Model

This article presents a voltage-controlled PIN diode attenuator using an accurate PIN diode model that can precisely simulate the attenuation characteristics. After carefully investigating the problems with conventional PIN diode models, an accurate PI...
PIN diodes have been widely used in a variety of microwave and RF applications, including antenna switches, phase shifters and attenuators. PIN diode attenuators are used extensively in automatic gain control (AGC) and RF leveling applications. Most PIN diode attenuators control the attenuation characteristics through the forward bias current....
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An Enhanced 3D-TLM Solver

The main criterion when an EM engineer uses modeling and design packages is that it should enable him to meet his daily challenges of designing new products that work in their intended environment. This is now becoming a reality with the advent of the Micro-stripes Version 6.1 3D-EM modeling...
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Enterprise Software for RF Device Characterization

In today's competitive marketplace the characterization of RF semiconductor devices for modeling, design, applications and process improvement must be faster, more efficient, and more repeatable and accurate as companies strive to improve their product performance, design productivity and time to market. However, help is on hand with the Wavevue...
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RF Closure Shortens the Product Development Process

Applied Wave Research Inc. (AWR™) has focused on an engineering effort to eliminate uncertainty in the high frequency design process by closing gaps in existing design methodologies and strengthening the links between system specifications and circuit performance, electrical design and physical layout, and computer simulation and RF measurements. This...
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Software for Creation of Custom Radar Pulse Patterns

Creating single-emitter pulse patterns for testing radar receivers is a complex, time-consuming process because of the extensive mathematics required, whether creating the initial waveform, modifying any of its characteristics such as pulse shaping and compression, or creating custom pulse patterns. A comprehensive software application called Signal Studio for Pulse...
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Pulsed I-V for Nonlinear Modeling

Current-voltage characterization under suitably performed pulsed bias conditions can more closely approximate the dynamic behavior of transistors and diodes under large signal RF conditions. Some understanding of the basics and a relatively simple inst...
Accurate, nonlinear, active device models are critical to achieving design success for circuits such as power amplifiers, oscillators and mixers, using computer-aided engineering (CAE) software such as Agilent Technologies' Advanced Design System (ADS™), Applied Wave Research's Microwave Office™, Eagleware's Genesys™ or Ansoft's Serenade™. Prior work has made it clear...
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Developing Sophisticated Models for Capacitors, Inductors and Other Passive Components

It is useful to model the non-ideal characteristics of capacitors, inductors and other passive components by using multi-element "schematics," where each element represents some portion of the device's behavior. Traditional models for these devices suf...
Traditional capacitor and inductor models have consisted of two or three elements (capacitor examples are shown in Figure 1 ). The two-element models provide a simple way to define the device. From a circuit designer's viewpoint, the two-element models may suffice for applications where the component is being used...
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Memory Effect Reduction for LDMOS Bias Circuits

Memory effects have taken a very important role in today's design of base station power amplifiers. For example, they are responsible for limiting the cancellation when pre-distortion is applied to a power amplifier system.<sup>1</sup> This study show...
Electrical memory effects are defined as changes in amplitude and phase of distortion components caused by modulation frequency. There are several ways of measuring memory effects. One of the most common is to plot the phase and amplitude of the distortion parameters with respect to the tone spacing in...
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