WCDMA Quasi-Direct Modulator
with VGA and PA Driver
Typical Operating Characteristics
(V CC = +2.85V, f RF = 1950MHz, MPL = 1, and T A = +25°C, unless otherwise noted.)
EVM vs. P OUT
P OUT
ACPR1 vs. V VGC
OUTPUT SPECTRUM vs. FREQUENCY
10
9
20
10
10
0
-10
WANTED SIGNAL, 0dB
RF IMAGE, 15dB
-35dB
8
7
6
5
T A = -40 ° C
T A = +85 ° C
T A = +25 ° C
0
-10
-20
-30
-40
-50
T A = -40 ° C
T A = +25 ° C
T A = +85 ° C
-20
-30
-40
-50
-60
-70
-80
RF LO-3IF, RF LO-2IF,
-32dB
RF LO, -42dB
4
-30 -26 -22 -18 -14 -10
-6
-2
2
6
-60
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
-90
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
P OUT (dBm)
OUTPUT NOISE DENSITY vs. V VGC
V VGC (V)
I CC vs. V VGC
FREQUENCY (GHz)
BASEBAND FILTER REPSONSE
-130
-132
-134
-136
-138
-140
-142
-144
-146
f RF = 1922.4MHz
T A = +25 ° C
T A = -40 ° C
f = 2112.4MHz
110
100
90
80
70
60
50
V CC = 2.7V TO 3.3V,
INPUT APPLIED
T A = +85 ° C
10
0
-10
-20
-30
-148
-150
-152
-154
f = 1880MHz
T A = +85 ° C
40
30
20
T A = -40 ° C
T A = +25 ° C
-40
-50
-60
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
0.4 0.6
0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
0
2
4
6
8
10 12 14 16 18 20
60
V VGC (V)
CARRIER AND SIDEBAND SUPPRESSION
vs. P OUT
70
V VGC (V)
VGC SLOPE LINEARITY vs. P OUT
10
FREQUENCY (MHz)
FREQUENCY SETTLING TIME
50
CARRIER
65
T A = +85 ° C
5
FROM IDLE
FROM SHDN
60
0
40
30
55
50
T A = +25 ° C
-5
-10
20
SIDEBAND
45
40
T A = -40 ° C
-15
FROM 1920MHz
TO 1980MHz
10
0
35
30
-20
-25
-74
-64
-54
-44
-34
-24
-14
-4
6
-74
-64
-54
-44
-34
-24
-14
-4
6
0
100 200 300 400 500 600 700 800 900
P OUT (dBm)
P OUT (dBm)
TIME ( μ s)
_______________________________________________________________________________________
5
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