Typical operating characteristics (continued) – Rainbow Electronics MAX2645 User Manual
Page 6
MAX2645
3.4GHz to 3.8GHz SiGe
Low-Noise Amplifier/PA Predriver
6
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(MAX2645 EV kit, V
CC
= +3.3V, R
BIAS
= 20k
Ω, f
RFIN
= 3550MHz, T
A
= +25°C, unless otherwise noted.)
0
1
3
2
4
5
NOISE FIGURE vs. R
BIAS
(HIGH-GAIN MODE)
MAX2645-13
R
BIAS
(k
Ω)
NOISE FIGURE (dB)
15.0
20.0
17.5
22.5
25.0
LOW-NOISE FIGURE CIRCUIT
1.0
2.5
2.0
1.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
3.0
3.5
4.5
5.0
5.5
INPUT IP3 vs. SUPPLY VOLTAGE
(HIGH-GAIN MODE)
MAX2645-14
SUPPLY VOLTAGE (V)
INPUT IP3 (dBm)
4.0
T
A
= -40
°C
T
A
= +85
°C
T
A
= +25
°C
LOW-NOISE FIGURE CIRCUIT
10.5
12.0
11.5
11.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
3.0
3.5
4.5
5.0
5.5
INPUT IP3 vs. SUPPLY VOLTAGE
(LOW-GAIN MODE)
MAX2645-15
SUPPLY VOLTAGE (V)
INPUT IP3 (dBm)
4.0
T
A
= +85
°C
T
A
= +25
°C
T
A
= -40
°C
LOW-NOISE FIGURE CIRCUIT
-1
1
5
3
7
9
INPUT IP3 vs. R
BIAS
(HIGH-GAIN MODE)
MAX2645-16
R
BIAS
(k
Ω)
INPUT IP3 (dBm)
15.0
20.0
17.5
22.5
25.0
V
CC
= 5V
V
CC
= 3.3V
LOW-NOISE FIGURE CIRCUIT
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
15.5
15.0
17.5
20.0
22.5
25.0
INPUT IP3 vs. R
BIAS
(LOW-GAIN MODE)
MAX2645-17
R
BIAS
(k
Ω)
INPUT IP3 (dBm)
V
CC
= 5V
V
CC
= 3.3V
LOW-NOISE FIGURE CIRCUIT
-8.5
-7.0
-7.5
-8.0
-6.5
-6.0
-5.5
-5.0
-4.5
-4.0
-3.5
3.0
3.5
4.5
5.0
5.5
INPUT P1dB vs. SUPPLY VOLTAGE
(HIGH-GAIN MODE)
MAX2645-18
SUPPLY VOLTAGE (V)
INPUT P1dB (dBm)
4.0
T
A
= -40
°C
T
A
= +25
°C
T
A
= +85
°C
LOW-NOISE FIGURE CIRCUIT
-25
-15
-20
-5
-10
5
0
10
-10.0
-5.0
0
5.0
OUTPUT POWER vs. INPUT POWER
(LOW-GAIN MODE)
MAX2645-19
INPUT POWER (dBm)
OUTPUT POWER (dBm)
T
A
= +25
°C
T
A
= +85
°C
T
A
= -40
°C
LOW-NOISE FIGURE CIRCUIT
-6
-7
-4
-5
-3
-2
INPUT P1dB vs. R
BIAS
(HIGH-GAIN MODE)
MAX2645-20
R
BIAS
(k
Ω)
INPUT P1dB (dBm)
15.0
20.0
17.5
22.5
25.0
V
CC
= 5V
V
CC
= 3.3V
LOW-NOISE FIGURE CIRCUIT
1.00
1.50
1.25
2.00
1.75
2.25
2.50
3.4
3.6
3.5
3.7
3.8
INPUT VSWR vs. FREQUENCY
MAX2645-21
FREQUENCY (GHz)
VSWR
HIGH GAIN
LOW GAIN
LOW-NOISE FIGURE CIRCUIT