Complete Dual-Band
Quadrature Transmitter
6  _______________________________________________________________________________________
-3.0
-1.5
-2.0
-2.5
-1.0
-0.5
0
0
20
15
5   10
25  30  35  40  45  50
I/Q BASEBAND FREQUENCY RESPONSE
FREQUENCY (MHz)
-50
-150
0.001
0.01
0.1
1
10
PHASE NOISE LOW-BAND OSCILLATOR
vs. FREQUENCY OFFSET (181.26MHz)
-130
OFFSET FREQUENCY (MHz)
-110
-90
-70
-80
-100
-120
-140
-60
F
COMP
 = 360kHz
-90
-70
-80
-50
-60
-30
-40
-20
0
-10
10
1500    1700    1900    2100    2300    2500
RFH OUTPUT SPECTRUM
FREQUENCY (MHz)
IMAGE
DESIRED
LO
-80
-60
-70
-40
-50
-30
-20
-20  -16   -12   -8    -4
0
4    8
CASCADED ACPR/ALT vs. POWER (RFL)
POWER (dBm)
ACPR WITH ROOT RAISED
COSINE FILTER
ACPR WITHOUT FILTER
ALT WITH OR WITHOUT FILTER
-80
-60
-70
-40
-50
-30
-20
-24  -20   -16   -12   -8   -4   0    4    6
CASCADED ACPR/ALT vs. POWER (RFH)
POWER (dBm)
ACPR WITH ROOT RAISED
COSINE FILTER
ACPR WITHOUT ROOT
RAISED COSINE FILTER
ALT WITH OR WITHOUT ROOT
RAISED COSINE FILTER
LOL PORT S11
1: 700MHz, 72& j51&
2: 966MHz, 60& j46&
3: 1.22MHz, 52& j38&
4: 1.5GHz, 40& j25&
4
1
2
3
LOH PORT S11t
1600MHz TO 2500MHz
1: 1.6GHz, 40& j25&
2: 1.75GHz, 36& j22&
3: 1.88GHz, 34& j18&
4: 2.01GHz, 32& j15&
5: 2.5GHz, 29& j0&
4
5
1
2
3
Typical Operating Characteristics (continued)
(MAX2369EVKIT, V
CC
= +2.8V, V
BAT
= 3.0V, T
A
= +25癈, unless otherwise noted.)
-80
-60
-70
-40
-50
-20
-30
-10
10
0
20
500
700
900
1100    1300    1500
RFL OUTPUT SPECTRUM
FREQUENCY (MHz)
IMAGE
DESIRED
LO
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