advertisment Advertisement
This ad will close in  seconds. Skip now
advertisment Advertisement
advertisment Advertisement
advertisment Advertisement
advertisment Advertisement

Software & CAD

Effects of Grounding and Bias Circuit on the Performance of High Frequency Linear Amplifiers

The design of a high frequency amplifier is normally based on the S-parameters supplied by the manufacturer of the active device. However, in a practical design, these parameters are affected by the DC bias network and the grounding of the active devic...
February 1, 2003
In the design of high frequency power amplifiers, one of the parameters is the stability of the active device. The stability of the active device is determined by the Rollet stability factor K. If K > 1, then the active device is unconditionally stable and the design of the...
Read More

Hybrid Synthesizer Tutorial

Use of a variety of synthesis blocks to create frequency synthesis systems with enhanced performance characteristics
February 1, 2003
Frequency synthesizers are used in a variety of communications and timing systems. Phase-locked loops (PLL) have been the "workhorse" of the majority of traditional synthesizers and clock generation circuits. However, there are other types of synthesis blocks available such as direct digital synthesizers (DDS), mixers, frequency doublers and dividers...
Read More

HFSS Software for Next-generation Design

January 1, 2003
When HFSS™ was introduced in February 1990, it created a new era in microwave design. Prior to this event, microwave design was limited to simple analyses and cut-and-try methods. With HFSS, engineers could conveniently build, analyze and refine three-dimensional (3D) microwave prototypes using their computers. For the first time,...
Read More

New Enhancements for the GENESYS Software Suite

January 1, 2003
All 15 modules of the GENESYS RF/microwave design software suite have recently been enhanced. For 17 years, Eagleware has worked with thousands of customers worldwide to continuously upgrade its suite of synthesis, simulation and design environment tools. Major enhancements in the current release include new models, an antenna pattern...
Read More

A 2.4 GHz CMOS Power Amplifier with 20 dBm Output Power for Bluetooth and WLAN Applications

This article presents a 2.4 GHz CMOS power amplifier (PA) with an output power of 20 dBm using a 0.25 µm 1P5M standard CMOS process. The PA uses a diode connected NMOS transistor functioning as a diode linearizer. It is believed that this is the first ...
January 1, 2003
Due to the fast development of wireless communications, a low cost, high performance, high integration technology is needed for system on a chip (SOC) implementation. The CMOS technology provides a good solution for SOC integration. 1 Recent improvements of the standard CMOS process make it possible to implement RF...
Read More

An RF Module Design for a Multi-mode Handset

This article describes a novel design of an RF module for a multi-mode handset and presents an example of an RF module for a W-CDMA/GSM/DCS tri-band and dual-mode handset. The entire module, including a direct modulation transmitter and a superheterody...
January 1, 2003
The number of mobile users is predicted to reach 1.7 billion by the year 2010. More than 45 percent of them will use high data speed services. W-CDMA, proposed by IMT2000, has become the most practical and important system for the development of new wireless communications. Nevertheless, second generation...
Read More

Interactive Interdigital Filter Design Using MMICAD Software

January 1, 2003
Successful microwave circuit realization requires flexible circuit analysis tools that allow engineers to prototype, analyze and verify their circuits. Today, available software tools offer standard features such as frequency analysis, tuning and optimization, but are differentiated by their model libraries and special customization capabilities. This article describes the design...
Read More

High Efficiency Class B, E and F Power Amplifiers: The Magic of Parallel Circuits

December 1, 2002
Modern commercial and military communication systems require high efficiency, long term operating conditions. For this purpose, the power amplifiers, as final and highly current-consuming transmitter elements, are developed using the high efficiency class B, F or E modes of operation, depending on the technical requirements. In class B operation,...
Read More

A Measurement-based Behavioral Model for I/Q RF Modulators

This article describes a nonlinear behavioral modeling technique for application to I/Q modulated communication channels. The model data was gathered by independent measurements of an I/Q modulator and amplifier, using vector signal generators and anal...
December 1, 2002
The W-CDMA standard expresses transmit quality in terms of EVM and ACLR, and receive quality in bit error ratio (BER). These quality measurements are simple scalar numbers representing a very complicated system. Modern communications channels (still) consist of a number of concatenated functions such as baseband (BB) processor, DAC,...
Read More

A Fast and Flexible Circuit Board Plotter

November 1, 2002
When employing circuit board plotters for product development the main requirement is for fast, efficient and flexible operation. Consequently, the high costs incurred by the long waiting periods inherent when externally procuring circuit board prototypes, particularly those with RF substrates, can be avoided. The ProtoMat 95s/II meets these requirements,...
Read More

Sign-In

Forgot your password?

No Account? Sign Up!

Get access to premium content and e-newsletters by registering on the web site.  You can also subscribe to Microwave Journal magazine.

Sign-Up

advertisment Advertisement