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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...

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...

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...

The last few years have seen the manufacturers of chips for short range devices (SRD) operating in the ISM frequency bands (315, 433, 869 and 915 MHz) significantly improving their products. Alongside this, SAW device manufacturers have been endeavoring to develop products offering the best solutions in terms of...

The primary motivation for using a system simulator is to establish the right system architecture and formulate suitable specifications for each of the underlying components. Accomplishing this goal helps companies to reduce time-to-market by eliminating iterations and rework, and to reduce system cost by ensuring that components are not...

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...

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...

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...

A new local oscillator (LO) doubler module has been introduced that covers the 3.6 to 13.3 GHz output range in a compact 3.0" x 1.5" x 0.375" package. The doubler features internal filtering and voltage-variable output power. The model PFDM-3R66R65-13-7R5DC-SFF takes a 3.6 to 6.65 GHz RF input signal...

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....