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Power Efficiency in Broadband Wireless Communications
book

Power Efficiency in Broadband Wireless Communications

by Pooria Varahram, Somayeh Mohammady, Borhanuddin Mohd Ali, Nasri Sulaiman
August 2014
Intermediate to advanced content levelIntermediate to advanced
340 pages
8h 49m
English
CRC Press
Content preview from Power Efficiency in Broadband Wireless Communications
38
Power effiCienCy in wireless CommuniCations
3.4.2 Class B
e operation of a class B power amplifier is different than a class A
in that it operates at a zero quiescent current, hence the DC power is
small.is causes its efficiency to be higher than a class A power amplifier.
iscomes at the expense of the linearity of the power amplifier.
Figure3.10 shows how the class B amplifier operates. e output
power of the single-ended class B amplifier is
=⋅
PI
V
1
2
oo
o
(3.19)
300
250
200
I
d
(mA)
I
d
(mA)
150
100
50
I
dq
0
250
200
150
100
50
0
0510
V
dd
V
ds
(V)
VGS5
VGS4
VGS3
VGS2
VGS1
15
(a)
(b)
20
0 0.2 0.4
Time (nsec)
0.6
0.8 1
l
om
Figure 3.10 (a) Load line and (b) current waveform for the ...
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Publisher Resources

ISBN: 9781466595484