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

Test and Measurement

AWGN Generators with Precise Control of Resolution and Noise Density

November 1, 2003
Additive white Gaussian noise (AWGN) has proven itself over the years as a simple yet extremely valuable tool in measurements ranging from BER and SINAD testing to wireless link emulation and the overall characterization of communications receiver performance. The unique characteristics of AWGN are becoming even more useful now...
Read More

A Two-path Vector Signal Generator

November 1, 2003
Setting new standards in flexibility and performance and opening the possibility for new applications, the R&S SMU200A is said to be the first high end generator to combine two complete digital signal generators with modulation capabilities in one instrument. It provides space for up to two RF paths in...
Read More

Cross-modulation in a CDMA Mobile Phone Receiver

October 1, 2003
Determining cross-modulation interference is an important factor in the design of a code division multiple access (CDMA) mobile transceiver. The cross-modulation interference level directly affects the performance of the receiver's ability to overcome the spurious interferences, such as what the IS-98 1 calls single tone desensitization. A few papers...
Read More

The Concept of Predistortion

The intention of this article is to provide a tool for the design of a predistorter, a component intended to correct unwanted nonlinear effects in power amplifiers. In order to come up with a design, a concept of predistortion is discussed. The conclus...
October 1, 2003
This article continues the trend of previous publications, 1,2 to simplify the prediction of RF performance of systems designed for wireless digital communications. The first shows the correlation between sidelobes and intermodulation (IM) products. Sidelobes are the result of the spectrum re-growth when a digitally modulated signal is applied...
Read More

Custom Test Fixtures Using Bolt-on Transitions and Calibration Kits

September 1, 2003
The term "one size fits all" has never applied to microwave test fixtures. They are instead almost always custom creations designed to serve a specific test application, and cannot easily be modified to meet other needs in the future. This has always presented a problem for cost-conscious designers. In...
Read More

Application of GTEM Cells to Wireless Communication Transceiver Designs

The GTEM cell has been widely accepted as a sufficient tool in electromagnetic compatibility for both radiated susceptibility tests and radiated emission tests. In this article, the relationships among basic quantities such as input power, electric fie...
September 1, 2003
The gigahertz transverse electromagnetic mode (GTEM) cell was first proposed in 1987 1 and subsequently patented in 1989 by D. Konigstein and D. Hansen 2 as a high frequency variant of the transverse electromagnetic mode (TEM) cell, which is also known as the Crawford cell. 3 The GTEM cell...
Read More

A Universal Oscillator Analysis Technique that Accurately Estimates Frequency and Output Power

During the last few decades, many different oscillator models and analysis techniques have been presented. From the negative impedance model, cavity type and DROs to the general feedback type, all oscillators have one common property. They are nonlinea...
September 1, 2003
Generally, an oscillator can be seen as a positive feedback system. It usually consists of an amplifier followed by a resonator, which is fed back to the amplifier input, as shown in Figure 1 . The amplifier task is to compensate for the losses in the resonator, and the...
Read More

Power Meters with 20 MHz Bandwidth Designed for Communications, Wireless and Aerospace Applications

August 1, 2003
Accurately measuring the power in wideband signals used in 3G and pulsed systems requires a power meter with a high bandwidth. To address this market condition, the ML2487A (single-channel) and ML2488A (dual-channel) high speed peak power meters have been developed that feature 20 MHz channel bandwidth, which is a...
Read More

A 4 GHz Fractional-N Synthesizer for Multi-mode Wireless Applications

July 1, 2003
Frequency synthesizers are fundamental building blocks in any wireless system. The need for reducing component count in wireless systems continues to drive synthesizer integration onto single systems-on-a-chip (SoC). Many multi-standard wireless products are emerging with combinations of WLAN 802.11a/b/g, GSM, Bluetooth, GPS and CDMA. One of the most challenging...
Read More

Conformal Subsections for Accurate EM Analysis

June 1, 2003
The fast fourier transform (FFT) approach to the method of moments (MoM) is well known for providing high accuracy, high dynamic range and robust electromagnetic (EM) analysis of planar circuits. The FFT consistently calculates the coupling between subsections to full numerical precision; no error is introduced by complex multi-dimensional...
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