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Industry News

Predicting the EVM Performance of WLAN Power Amplifiers with OFDM Signals

This article details a method of predicting the error vector magnitude (EVM) of wireless local area network (WLAN) power amplifiers (PA). It starts with a definition and explanation of EVM, and explains the EVM specification as defined by the IEEE 802....
The 802.11a/g WLAN standards stipulate the use of orthogonal frequency division multiplexing (OFDM) signals with M-QAM symbols modulation, where M can be as high as 64. These wideband digital modulations demand PAs with high linearity, due to the inherent high peak-to-average ratio (PAR) of these signals. This article describes...
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S-band High Power Solid-state Amplifier Design and Development

The design and development of a 230 W power amplifier operating at S-band (2.35 to 2.45 GHz) is described. The motivation behind this development is the need for a microwave driver amplifier to be used in the linear accelerator facility at the Institut...
The starting point for the design of the S-band high power amplifier was that it had to meet the specifications given in Table 1 . These specifications are dictated by the actual operating conditions of the magnetron, which the amplifier is going to feed with microwave power. Solid-state technology...
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Design of a Novel Balun for a Star Configuration Double-balanced Mixer at S-band

A double-balanced mixer (DBM) has some advantages over other types of mixers. Ring and star configurations are available for the construction of a DBM. Between the two, the star configuration is preferred for high frequency operation. The star configur...
The merits of a doubly balanced mixer (DBM) include high dynamic range, good port-to-port isolation and rejection of even-order spurious responses. 1 The ring configuration, using two trifilar wound ferrite transformers, is most commonly used for DBMs at low frequencies. The application of a transformer DBM is, however, limited...
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A Low Profile Switch Filter Bank

Switch filter banks or integrated filter assemblies have been primarily built as large high profile block type structures that consume a large portion of available design space. This has primarily been driven by the physical limitations of the RF filters, switches and control circuitry. The Lorch Microwave model 4IFA-1600/22-300-MP...
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Two Cards to Convert a Microwave Receiver into a State-of-the-Art ELINT System

Once again the global market for capable electronic intelligence gathering systems is heating up in the wake of increased investments supporting homeland defense both in the US and overseas. Companies that already develop and produce microwave receivers capable of covering the UHF thorough millimeter-wave bands may already have products...
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Comprehensive Models for RLC Components to Accelerate PCB Designs

Powerfully flexible software models are now available for surface-mount (SMT) resistor, inductor and capacitor (RLC) components that are accurate over wide ranges of frequency, part value and mounting configurations. These unique, substrate-scalable Global Models™ are developed from careful measurements taken in typical application circuit mounts on multiple boards. Global...
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New Products

NEW WAVES: AMPLIFIERS AND OSCILLATORS High Power Amplifier The model PHC 447-500 is a 500 W pulsed high power amplifier (HPA) that utilizes class AB bias to achieve high linearity. This amplifier is designed to operate up to 10 percent duty factor and pulse widths up to 2 ms....
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