Common-mode termination requirements in concurrent dual-band push-pull power amplifiers

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2017-01-01
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Montgomery, Byron
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Nathan Neihart
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Electrical and Computer Engineering

The Department of Electrical and Computer Engineering (ECpE) contains two focuses. The focus on Electrical Engineering teaches students in the fields of control systems, electromagnetics and non-destructive evaluation, microelectronics, electric power & energy systems, and the like. The Computer Engineering focus teaches in the fields of software systems, embedded systems, networking, information security, computer architecture, etc.

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The Department of Electrical Engineering was formed in 1909 from the division of the Department of Physics and Electrical Engineering. In 1985 its name changed to Department of Electrical Engineering and Computer Engineering. In 1995 it became the Department of Electrical and Computer Engineering.

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1909-present

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  • Department of Electrical Engineering (1909-1985)
  • Department of Electrical Engineering and Computer Engineering (1985-1995)

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Concurrent dual-band switch-mode power amplifiers require high common-mode impedance at their intermodulation frequencies. Baluns utilizing quarter-wave effects only present perfect open common-mode impedance at their design frequency. Attempting to use a balun in a dual-band push-pull power amplifier without taking the new dual-band requirements for common-mode impedance into account will result in efficiency loss. This thesis gives a complete derivation of the maximum theoretical drain efficiency in a class-D amplifier, and compares it with the dual-band case using an ideal balun at the output. This ideal balun is explored and the mechanics behind this efficiency loss is revealed. A solution is provided showing that the addition of some transmission lines can move impedance to those specific frequencies by rotation of the common-mode impedance without affecting the differential mode match.

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Sun Jan 01 00:00:00 UTC 2017