Hakala, Ilkka ; Gharavi, Leila ; Kaunisto, Risto
(2004)
Chireix Power Combining with Saturated Class-B
Power Amplifiers.
In: Gallium Arsenide applications symposium. GAAS 2004, 11—12 Ottobre, Amsterdam.
Full text available as:
Abstract
This paper describes the realization of a
Chireix power combining part of an outphasing system for
2.14 GHz consisting of two saturated class-B power
amplifiers and a Chireix power combiner circuit. The
Chireix power combining scheme can be used in Chireix
outphasing architecture, which is currently together with
EER and the Doherty amplifier one of the most prominent
research topics in power amplifier linearization / efficiency
enhancement area.
In an outphasing system, also known as LINC (Linear
Amplification of Nonlinear Components), an amplitude and
phase modulated signal is separated into two constant
envelope signals containing only phase modulation. The
original signal waveform can subsequently be reconstructed
by varying the phases of the two constant envelope signal
branches, thus enabling, ideally, linear amplification of the
original signal with system efficiency comparable to the
efficiency of the used PAs.
In this paper, the design and implementation as well as
the measurement results of a microstrip-line Chireixcombiner
together with saturated class-B pHEMT power
amplifiers for WCDMA downlink band 2.11-2.17 GHz are
reported. The measurement results verify that the concept
is indeed functional, and significant efficiency improvement
over traditional power combining can be attained. At peak
envelope power 37.4 dBm system efficiency of 77 % was
measured, and at –8 dB back-off, representing the
computational average point for WCDMA signal, system
efficiency of 43 % was measured.
Abstract
This paper describes the realization of a
Chireix power combining part of an outphasing system for
2.14 GHz consisting of two saturated class-B power
amplifiers and a Chireix power combiner circuit. The
Chireix power combining scheme can be used in Chireix
outphasing architecture, which is currently together with
EER and the Doherty amplifier one of the most prominent
research topics in power amplifier linearization / efficiency
enhancement area.
In an outphasing system, also known as LINC (Linear
Amplification of Nonlinear Components), an amplitude and
phase modulated signal is separated into two constant
envelope signals containing only phase modulation. The
original signal waveform can subsequently be reconstructed
by varying the phases of the two constant envelope signal
branches, thus enabling, ideally, linear amplification of the
original signal with system efficiency comparable to the
efficiency of the used PAs.
In this paper, the design and implementation as well as
the measurement results of a microstrip-line Chireixcombiner
together with saturated class-B pHEMT power
amplifiers for WCDMA downlink band 2.11-2.17 GHz are
reported. The measurement results verify that the concept
is indeed functional, and significant efficiency improvement
over traditional power combining can be attained. At peak
envelope power 37.4 dBm system efficiency of 77 % was
measured, and at –8 dB back-off, representing the
computational average point for WCDMA signal, system
efficiency of 43 % was measured.
Document type
Conference or Workshop Item
(Paper)
Creators
Subjects
DOI
Deposit date
15 Jun 2005
Last modified
17 Feb 2016 14:10
URI
Other metadata
Document type
Conference or Workshop Item
(Paper)
Creators
Subjects
DOI
Deposit date
15 Jun 2005
Last modified
17 Feb 2016 14:10
URI
Downloads
Downloads
Staff only: