ALEXANDRIA, Va.—William H. Doherty was an engineer with Bell Telephone Laboratories in 1936 when he invented a circuit that used two tubes running in Class B configuration to act as a linear amplifier ...

SOUTHWICK, MASS.—Hitachi Kokusai Electric Comark LLC has a long standing history in the broadcast TV market. Comark started more than 40 years ago manufacturing RF components for UHF transmitters and ...

Newswise — In modern wireless communication systems, complex modulation techniques are widely adopted to meet the demands for high data rates and improved spectral efficiency. However, these ...

In a world of everything Doherty, there can be several variations on the standard Doherty amplifier architecture, in order to optimize the operation for different signal conditions. All of the ...

Launches industry’s most power efficient discrete Doherty amplifier based on the Gen 7 LDMOS BLF7G22L-130 transistor Expanding its portfolio of industry-leading RF power solutions, NXP, the ...

With the successful widespread deployment of Doherty amplifiers in cellular base stations, specific and dedicated devices should be considered to further improve performances and cost of the complete ...

In general terms, power amplifiers (PAs) used in communications systems must be large enough to amplify envelope peaks. This leads to amplifiers designed to offer the best efficiency at peak power ...

The Doherty Amplifier is used in an increasing number of radio transmitter applications to improve energy efficiency. This paper begins with an overview of Linearization and Efficiency Enhancement ...

Although the class B linear amplifier provides a simple and effective means for amplifying a modulated carrier, its low carrier efficiency is a definite disadvantage, particularly where high power is ...

Your article (“KRLD’s Dougherty Transmitter,” July 1) discussed “the Western Electric 407A2 50 kW water-cooled Dougherty transmitter at KRLD in Dallas.” When I took my FCC first class radiotelephone ...