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Research paper thumbnail of Phase Transients in Digital Radio Local Oscillators

1987 IEEE MTT-S International Microwave Symposium Digest, 1987

Phase transients that occur in microwave local oscilIators are discussed. The harmful effects of ... more Phase transients that occur in microwave local oscilIators are discussed. The harmful effects of these transients on coherent digital transmission are evaluated, with emphasis placed on complex modulation schemes such as 64 QAM or 256 QAM. The sources of phase transients are identified, and the methods that quantify these transients are presented along with procedures that ensure phase transient free operation of local oscilIators.

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Research paper thumbnail of Comparative Analysis of GaAs/LDMOS/GaN High Power Transistors in a Digital Predistortion Amplifier System

2005 Asia-Pacific Microwave Conference Proceedings

... Bill Vassilakis is Vice-President Corporate Research and Development at Powerwave Technologie... more ... Bill Vassilakis is Vice-President Corporate Research and Development at Powerwave Technologies, Santa Ana, CA 92705 USA (e-mail: bvassilakis opwav.com) Armando Cova is Principal Engineer, Corporate ... [2] L. Ding, GT Zhou, DR Morgan, Z. Ma, JSKenney, J. Kim, and ...

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Research paper thumbnail of Adjustable Multi-Sector Cellular Base Station Antenna

International Journal On Advances in Networks …, 2009

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Research paper thumbnail of High Efficiency Base Station Amplifier Architectures Utilizing LDMOS and GaN High Power Transistors

High efficiency amplifier architectures are critical in modern communication systems. Third gener... more High efficiency amplifier architectures are critical in modern communication systems. Third generation cellular systems and the upcoming LTE (Long Term Evolution) networks will continue to demand increasing transmitter efficiency and lower cost. In addition, linearity demands will be more stringent in order to meet the required spectral efficiencies, and the high bit throughput required by network users. INTRODUCTION With each successive generation of commercial cellular system deployment, the architecture of the Base Transceiver Station (BTS) has become more challenging. Figure 1 shows a typical high level block diagram, which contains the amplifier module, the LNA section, the required filtering, and the analog or baseband cards that interface with the rest of the system. In early systems, Single Carrier Power Amplifiers (SCPAs) were employed and the power from many transmitters combined with cavity combiners resulted poor efficiency and high losses. In 2 and 3 Generation digital ...

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Research paper thumbnail of On the Predistortability of High Efficiency Multi-carrier Power Amplifiers for Wireless Communication Infrastructure

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Research paper thumbnail of Single pole vertically polarized variable azimuth beamwidth antenna for wireless network

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Research paper thumbnail of Method and apparatus for aligning feed forward loops

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Research paper thumbnail of Feed forward RF power amplifier with high efficiency main amplifier and highly linear error amplifier

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Research paper thumbnail of Compound two-way antenna with installation compensator

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Research paper thumbnail of Low Power Multi-Beam Active Array for Cellular Communications

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Research paper thumbnail of Enhanced efficiency feed forward power amplifier with delay mismatched error cancellation loop

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Research paper thumbnail of Fast forward RF power amplifier with high efficiency main amplifier and highly linear error amplifier

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Research paper thumbnail of Deed Forward RF Power Amplifier with High Efficiency Main Amplifier and Highly Linear Error Amplifier

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Research paper thumbnail of Dual staggered vertically polarized variable azimuth beamwidth antenna for wireless network

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Research paper thumbnail of Enhanced efficiency feed forward power amplifier utilizing reduced cancellation bandwidth and small error amplifier

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Research paper thumbnail of Dual beam sector antenna array with low loss beam forming network

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Research paper thumbnail of Systems and Methods of Dynamic Bias Switching for Radio Frequency Power Amplifiers

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Research paper thumbnail of Broadband Coplanar Antenna Element

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Research paper thumbnail of Omni directional broadband coplanar antenna element

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Research paper thumbnail of Amplification system having mask detection and bias compensation

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Research paper thumbnail of Phase Transients in Digital Radio Local Oscillators

1987 IEEE MTT-S International Microwave Symposium Digest, 1987

Phase transients that occur in microwave local oscilIators are discussed. The harmful effects of ... more Phase transients that occur in microwave local oscilIators are discussed. The harmful effects of these transients on coherent digital transmission are evaluated, with emphasis placed on complex modulation schemes such as 64 QAM or 256 QAM. The sources of phase transients are identified, and the methods that quantify these transients are presented along with procedures that ensure phase transient free operation of local oscilIators.

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Research paper thumbnail of Comparative Analysis of GaAs/LDMOS/GaN High Power Transistors in a Digital Predistortion Amplifier System

2005 Asia-Pacific Microwave Conference Proceedings

... Bill Vassilakis is Vice-President Corporate Research and Development at Powerwave Technologie... more ... Bill Vassilakis is Vice-President Corporate Research and Development at Powerwave Technologies, Santa Ana, CA 92705 USA (e-mail: bvassilakis opwav.com) Armando Cova is Principal Engineer, Corporate ... [2] L. Ding, GT Zhou, DR Morgan, Z. Ma, JSKenney, J. Kim, and ...

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Research paper thumbnail of Adjustable Multi-Sector Cellular Base Station Antenna

International Journal On Advances in Networks …, 2009

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Research paper thumbnail of High Efficiency Base Station Amplifier Architectures Utilizing LDMOS and GaN High Power Transistors

High efficiency amplifier architectures are critical in modern communication systems. Third gener... more High efficiency amplifier architectures are critical in modern communication systems. Third generation cellular systems and the upcoming LTE (Long Term Evolution) networks will continue to demand increasing transmitter efficiency and lower cost. In addition, linearity demands will be more stringent in order to meet the required spectral efficiencies, and the high bit throughput required by network users. INTRODUCTION With each successive generation of commercial cellular system deployment, the architecture of the Base Transceiver Station (BTS) has become more challenging. Figure 1 shows a typical high level block diagram, which contains the amplifier module, the LNA section, the required filtering, and the analog or baseband cards that interface with the rest of the system. In early systems, Single Carrier Power Amplifiers (SCPAs) were employed and the power from many transmitters combined with cavity combiners resulted poor efficiency and high losses. In 2 and 3 Generation digital ...

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Research paper thumbnail of On the Predistortability of High Efficiency Multi-carrier Power Amplifiers for Wireless Communication Infrastructure

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Research paper thumbnail of Single pole vertically polarized variable azimuth beamwidth antenna for wireless network

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Research paper thumbnail of Method and apparatus for aligning feed forward loops

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Research paper thumbnail of Feed forward RF power amplifier with high efficiency main amplifier and highly linear error amplifier

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Research paper thumbnail of Compound two-way antenna with installation compensator

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Research paper thumbnail of Low Power Multi-Beam Active Array for Cellular Communications

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Research paper thumbnail of Enhanced efficiency feed forward power amplifier with delay mismatched error cancellation loop

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Fast forward RF power amplifier with high efficiency main amplifier and highly linear error amplifier

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Deed Forward RF Power Amplifier with High Efficiency Main Amplifier and Highly Linear Error Amplifier

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dual staggered vertically polarized variable azimuth beamwidth antenna for wireless network

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Enhanced efficiency feed forward power amplifier utilizing reduced cancellation bandwidth and small error amplifier

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dual beam sector antenna array with low loss beam forming network

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Systems and Methods of Dynamic Bias Switching for Radio Frequency Power Amplifiers

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Broadband Coplanar Antenna Element

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Omni directional broadband coplanar antenna element

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Amplification system having mask detection and bias compensation

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