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Linear high-efficiency microwave power amplifiers using bandpass delta-sigma modulators

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5 Author(s)
Jayaraman, A. ; Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA ; Chen, P.F. ; Hanington, G. ; Larson, L.
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A novel amplifier configuration is described, in which a bandpass delta-sigma modulator is used to produce a two-level (digital) signal representing an analog radio frequency (RF) input. Subsequently, a switching-mode amplifier and bandpass filter are used to amplify the signal and remove unwanted spectral components. This configuration has the potential of achieving high efficiency (typical of switching mode amplifiers) together with high linearity. A simulated implementation with GaAs heterojunction bipolar transistors (HBT) is shown

Published in:

Microwave and Guided Wave Letters, IEEE  (Volume:8 ,  Issue: 3 )

Date of Publication:

Mar 1998

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