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Industry News

Thin Film Electronically Tunable Pre-selectors for Software Defined Radios

A multi-band, multi-waveform software defined radio (SDR) that provides programmable and re-configurable communications is at the core of ad-hoc networks, and ad-hoc networks are key to the transformational needs of the military (manned and unmanned). To meet interoperability requirements and mitigate co-site interference issues of a multi-band, multi-waveform architecture,...
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5.7 GHz 0.25 μm CMOS RF Front-end Circuits for an IEEE 802.11a WLAN Receiver

A 5.7 GHz 0.25 mm CMOS RF front-end, including a CMOS differential LNA and a CMOS Gilbert-cell mixer, for an 802.11a WLAN receiver is presented. The differential LNA, fabricated with the 0.25 mm 1P5M standard CMOS process, utilizes a current-reuse tech...
Due to the growing demand for broadband wireless communications, the operating frequency is moving toward the 5 GHz U-NII band. The advantage of combining the baseband circuitry and the RF front-end on one single chip for cost savings is strongly desired for highly integrated system-on-chip (SoC) applications. Due to...
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Design of a Predistortion HPA Using a Frequency Up-conversion Mixing Operation

In this article, a new predistortion linearizing method using the frequency up-conversion operation of a microwave mixer is proposed. This linearizing method does not require any additional signal source in spite of the frequency up-conversion mixing o...
Mobile communication systems currently use linear modulation schemes for effective usage of the frequency spectrum resource. Signals that use linear modulation schemes, however, such as QPSK, and 16- and 64-QAM, have a high peak-to-average power ratio and the signal envelope is changed severely. Therefore, modern mobile communication systems require...
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Nonlinearity Test for a Fully Integrated Direct-conversion Receiver

This article reviews the definitions and measurement techniques of the nonlinear characteristics of a receiver. A series of tests is designed to identify the limiting stage in a fully integrated direct-conversion receiver (DCR). In particular, a dual-s...
The market demand for low cost and high performance wireless communication systems, including cellular phones, wireless local area networks (WLAN) and wireless personal area networks (WPAN), has attracted heavy investment and intensive research in the area of integrated RF transceiver design. 1–9 Unlike a traditional discrete component radio design,...
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Theoretical and Experimental Analysis of Resonant Microwave Reflection Amplifiers

In this article, the one-port transistor amplifier (OPTA) is studied in detail. This kind of amplifier offers a higher gain, with higher power efficiency at microwave frequencies, than a conventional two-port transmission amplifier. A new theoretical a...
Electromagnetic signals are used to transmit information in the form of amplitude, frequency, phase and time duration of an oscillation. In many cases, they must be amplified from a low to a higher power level by an amplifier having special basic characteristics, such as sufficient gain within a specific...
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Theory and Practical Considerations for Measuring Phase Noise Better Than –165 dBc/Hz: Part I

Phase noise requirements have a major influence on the design of a communication system because they impact the local oscillator design and hence the cost of the radio. Since the number of wireless subscribers and thus, RF interference, continues to in...
Phase noise is a frequency domain measure of the short-term stability of an oscillator. It is measured and specified as noise power, relative to carrier power, in a one Hz bandwidth at a given frequency offset. Typically, for a communication system oscillator, the phase noise requirement is specified for...
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New Products

InGaP HBT Transistor The model MMA707-3030 is an InGaP HBT transistor that provides high performance to 2.2 GHz. This model delivers up to 12 dB gain, a P1dB of +31 dBm, and an OIP3 of +50 dBm over 100 MHz bandwidths up to 2.4 GHz. This device is suitable...
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