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1-W high linear broadband RF power amplifier with Certesian feedback for TETRA modulation [Application Notes]

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5 Author(s)
Narendra, K. ; Dept. of R&D, Motorola Technol., Penang ; Anand, L. ; Sangaran, P. ; Ain, M.F.
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Designing a high-linearity, high-efficiency RF power amplifier with wide bandwidth design is a real challenge. This article explores a technique to achieve 30 dBm output power with an adjacent channel power ratio (ACPR) of more than -65 dBc for frequency range of 800-900 MHz. A three-stage gallium arsenide heterojunction bipolar transistor (GaAs HBT) RF power amplifier with Cartesian feedback in closed-loop form is the main architecture of the design. An adaptive bias technique was used in the RF power amplifier design to achieve high linearity while preserving good efficiency.

Published in:

Microwave Magazine, IEEE  (Volume:9 ,  Issue: 3 )

Date of Publication:

June 2008

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