RF Power Amplifier poster as presented at the Brooklyn 5G Summit

1. Communication Systems & Networks Research Group
Merchant Venturers Building, Woodland Road, Bristol. BS8 1TR
@BristolCSN http://www.bristol.ac.uk/engineering/research/csn
Communication Systems
and Networks Group
• Power Amplifiers (PA) needs to be able to operate for
• Multi-carrier.
• Multi-band.
• Multi-standard systems.
• Amplifiers must be highly linear.
RFMD’s RF3833 25W GaN Wide-
Band Power
ACPR Performance when Δf = 40MHz ACPR Performance when Δf = 150MHz..
Digital
90o
0o
:2 :4 :8
DAC
DAC
I
Q
To the receiver
PA
Duplexer
Alias
reject
Prescaler
Tx
Filter
VCO
Quadrature modulator
This can be part
of the test bed
A Tunable Transmitter for Frequency Agile
Radios
OMNPkg. ParasiticIMN
Zintrin (Frequency
independent)
Constant? And
frequency
dependent
50 Ohm
(Freq.
ind.)
Power Amplifier Design with tunable Matching
Networks
C1 C2
L
Analysis of Tunable Matching Networks
2.6 GHz
2.1 GHz
0.9 GHz
2nd Harmonics
Design and Linearisation of Broadband -
Reconfigurable RF Power Amplifiers
Output Matching for Re-configurable PA
Multichannel Power Amplifier Linearisation
Multiband Power Amplifier linearisation
System Block Diagram
The Impact of Channel Gap
K N Gebremicael , Eyad Arabi, Kevin Morris and M A Beach
Email: m.a.beach@Bristol.ac.uk or kevin.morris@bristol.ac.uk
Network Coverage
• Inductors replaced by lines
• Genetic algorithm used for
optimization
• Coverage of fundamental
and 2nd harmonic at 3
frequencies
C1
Z0 , Ɵ3 Z0 , Ɵ1 Z0 , Ɵ2
C2
C3
A reconfigurable or wideband PA is the key component
on a tunable transmitter
A tunable matching network can correct the effect of
the package at multiple frequencies
Concurrent multi-band operation impacts the behavioural
model:
• Therefore we must account for all carriers when
applying DPD.
• The spectral gap between the bands impacts the
model, with stronger memory effect at smaller Δf
than at wider Δf.
Aim: To develop amplifier technologies which are frequency agile, linear and efficient for 5G
and beyond applications, for both sub 6GHz and millimetre wave applications