Novel multimode J-pHEMT front-end architecture with power-control scheme for maximum efficiency

Based upon a unique junction pseudomorphic high electron-mobility transistor (J-pHEMT) device, a novel method of providing high-efficiency power amplifier (PA) power control for variable envelope modulation schemes is demonstrated for enhanced data rates for global system for mobile communications e...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2005-06, Vol.53 (6), p.2251-2258
Main Authors: Clifton, J.C., Albasha, L., Lawrenson, A., Eaton, A.M.
Format: Article
Language:English
Subjects:
Adaptive bias control
Applied sciences
Architecture
Broadband amplifiers
Cellular
Circuit properties
Code Division Multiple Access
Communication systems
Devices
Dynamical systems
Dynamics
Electric, optical and optoelectronic circuits
Electronics
enhanced data rates for global system for mobile communications (GSM) evolution (EDGE)
envelope tracking
Exact sciences and technology
Global System for Mobile Communications
GSM
High power amplifiers
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Modulation
Modulation coding
monolithic microwave integrated circuit (MMIC) power amplifiers (PAs)
Multiaccess communication
PHEMTs
Power control
pseudomorphic high electron-mobility transistor (pHEMT)
Switches
Telephone sets
Transistors
Wireless communications
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Based upon a unique junction pseudomorphic high electron-mobility transistor (J-pHEMT) device, a novel method of providing high-efficiency power amplifier (PA) power control for variable envelope modulation schemes is demonstrated for enhanced data rates for global system for mobile communications evolution and wide-band code division multiple access. This new technique, based upon the use of a linear PA, was extended to provide a simple, but highly effective method of PA efficiency enhancement based upon dynamic adaptive bias control. Together, the architecture allows for substantially higher efficiency levels compared with conventional linear solutions over the entire range of handset operating conditions, while avoiding the necessity for complex control loops and linearization schemes. Furthermore, it is shown that the characteristics of the J-pHEMT, when used with this architecture, can be exploited to facilitate an efficient and completely novel single-chip PA plus antenna switch to substantially reduce the RF complexity of a cellular handset.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.848747