Passive Components

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Technical Feature The Use of Intermodulation Tables for Mixer Simulations The use of intermodulation table (IMT) files can lead to accurate prediction of the output frequency content of an up-converting or down-converting mixer in system simulations. For best results, custom IMT files should be constructed from mixer output spectrum...

Product Feature Software for Optimizing the Design and Low Cost Production of Waveguide Filters Zeland Software Inc. Fremont, CA Because of their low loss and high power-handling capability, waveguide filters have been widely used in telecommunications and wireless communications systems. The key to gaining a competitive edge in the...

Technical Feature Fixing the Curtice FET Model Convergence difficulties are common in nonlinear analyses of circuits using a Curtice model. The problem is not the model itself, but the limitations of the parameters describing the gate I/V characteristic. In this article, we show why that failure occurs, and how...

Technical Feature Simulating Multi-finger Power HBTs A new model of multi-finger heterojunction bipolar transistors (HBT) is presented to analyze and predict current collapse, bias dependence and output power. The simulation of multi-finger HBTs has proven to be very challenging in both computer-aided design and electromagnetic (EM) simulation. However, by...

Cover Feature A High Gain Power Amplifier with Variable Bias for Multi-mode WCMDA Applications RF Micro Devices Greensboro, NC This article describes a new high performance power amplifier (PA) for wideband code division multiple access (WCDMA) applications. With the transition from second generation (2G) systems, such as Global System...

Technical Feature Low Phase Noise SiGe Voltage-controlled Oscillators for Wireless Applications A low phase noise voltage-controlled oscillator (VCO) is one of the critical circuits in modern telecommunications systems. In recent years, silicon germanium (SiGe) BiCMOS technology has become one of the most promising technologies for VCO designs. This article...

Technical Feature A Varactor-tuned Oscillator with Linear Tuning Characteristic Munkyo Seo, Joo-Yeol Lee and Kyung-Kuk Lee LG Electronics Inc. Seoul, Korea Sangwook Nam Seoul National University Seoul, Korea In certain areas of microwave applications such as FMCW radars, FM modulators and phase-locked loop (PLL) circuits, the system performance is...

Technical Feature A New Type of Amplitude Equalizer for In-band Flatness Improvement There is a growing need in modern communication systems for low cost bandpass filters of small size, high selectivity and flat passband response in order to meet the demands for inter-channel power balance, and to avoid interference....

Application Note Technology and Innovation in Single Layer Capacitors Lambert Devoe and Alan Devoe Presidio Components Inc. San Diego, CA Single layer capacitors have been manufactured for many years for high frequency microwave applications. The simple parallel plate structure has advantages over multi-layer capacitors up to gigahertz frequencies due...

Cover Feature 2.5 V GaAs pHEMT Switches for GSM Handsets M/A-COM Lowell, MA A new line of robust GaAs pHEMT switches for operation in 2.5 V GSM handsets has been developed. These switches feature performance that is unrivaled in the industry for harmonics at 2.5 V in addition to...