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800MHz to 1000MHz Variable-Gain
Amplifier with Analog Gain Control
Typical Operating Characteristics
Two Attenuator Configuration
(Typical Application Circuit with two attenuators connected, V CC = +5.0V, R1 = 1.2k ? , R2 = 3.92k ? , f IN = 900MHz maximum gain
setting, P OUT = +5dBm, linearity measured at P OUT = +5dBm/tone, T A = +25°C, unless otherwise noted.)
INPUT RETURN LOSS
OUTPUT RETURN LOSS
0
vs. RF FREQUENCY
0
vs. RF FREQUENCY
GAIN vs. V CNTL
5
10
15
20
T A = -40 ° C
5
10
15
T A = +25 ° C
15
5
-5
T A = +25 ° C
T A = +85 ° C
T A = -40 ° C
25
30
35
T A = +85 ° C
T A = +25 ° C
20
25
T A = +85 ° C
T A = -40 ° C
-15
-25
40
700 800 900 1000 1100 1200 1300 1400 1500
30
700 800 900 1000 1100 1200 1300 1400 1500
-35
1.0
1.5
2.0
2.5 3.0
3.5
4.0
17
RF FREQUENCY (MHz)
GAIN vs. RF FREQUENCY
35
RF FREQUENCY (MHz)
REVERSE ISOLATION
vs. RF FREQUENCY
T A = +85 ° C
0
V CNTL (V)
INPUT RETURN LOSS
vs. RF FREQUENCY
15
T A = -40 ° C
30
5
10
13
T A = +25 ° C
T A = -40 ° C
T A = +25 ° C
15
MAXIMUM GAIN
11
9
7
T A = +85 ° C
25
20
20
25
30
42dB GAIN REDUCTION
700 800 900 1000 1100 1200 1300 1400 1500
700
900
1100
1300
1500
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
OUTPUT RETURN LOSS
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
0
5
10
vs. RF FREQUENCY
MAXIMUM GAIN
25
15
5
-5
GAIN vs. RF FREQUENCY
MAXIMUM GAIN
15
-15
20
-25
25
42dB GAIN REDUCTION
-35
44dB GAIN REDUCTION
30
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
-45
700 800 900 1000 1100 1200 1300 1400 1500
RF FREQUENCY (MHz)
_______________________________________________________________________________________
7
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