MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
4 _______________________________________________________________________________________
Typical Operating Characteristics
(MAX2642/MAX2643 EV kits, V
CC
= +3.0V, P
RFIN
= -30dBm, input and output are terminated to 50Ω, f
RFIN
= 900MHz, R
BIAS
=
510Ω, high-gain mode (low-gain mode is applicable only to the MAX2642), T
A
= +25°C, unless otherwise noted.)
-15
-11
-13
-7
-9
-3
-5
-1
3
1
5
0 400 600 800200 1000 1200 1400 1600 1800
INPUT THIRD-ORDER INTERCEPT
vs. R
BIAS
(HIGH GAIN)
MAX2642/43-01
R
BIAS
(Ω)
INPUT IP3 (dBm)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
-15
-1
-3
3
1
7
5
9
11
MAX2642
INPUT THIRD-ORDER INTERCEPT
vs. R
BIAS
(LOW GAIN)
MAX2642/43-02
R
BIAS
(Ω)
INPUT IP3 (dBm)
0 500 1000 1500 2000
-5
-7
-9
-11
-13
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
0
3
2
1
4
5
6
800 880860820 840 900 920 940 960 980 1000
NOISE FIGURE vs. FREQUENCY
MAX2642/43-03
FREQUENCY (MHz)
NOISE FIGURE (dB)
LOW GAIN
HIGH GAIN
MATCHED AT 900MHz
0
1
2
4
3
5
6
-40 -20 0 20 40 60 80 100
NOISE FIGURE vs. TEMPERATURE
MAX2642/43-04
TEMPERATURE (°C)
NOISE FIGURE (dB)
LOW GAIN
HIGH GAIN
-24
-20
-22
-14
-16
-18
-10
-12
-8
0 600 800200 400 1000 1200 1400 1600 1800
P1dB vs. R
BIAS
MAX2642/43-05
R
BIAS
(Ω)
P1dB (dBm)
T
A
= -40°C,
HIGH GAIN
T
A
= +85°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
T
A
= +85°C, LOW GAIN
T
A
= +25°C, LOW GAIN
T
A
= +25°C, HIGH GAIN
-28
-20
-24
-12
-16
-4
-8
0
8
4
12
-30 -22 -18-26 -14 -10 -6 -2 2
OUTPUT POWER vs. INPUT POWER
MAX2642/43-06
P
IN
(dBm)
P
OUT
(dBm)
510Ω, HIGH GAIN
1.1kΩ, LOW GAIN
510Ω, LOW GAIN
806Ω, LOW GAIN
806Ω, HIGH GAIN
1.1kΩ, HIGH GAIN
0
4
2
8
6
12
10
14
18
16
20
0 400 600 800200 1000 1200 1400 1600 1800
GAIN vs. R
BIAS
MAX2642/43-07
R
BIAS
(Ω)
GAIN (dB)
-2
-4
T
A
= +85°C, HIGH GAIN
T
A
= -40°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
T
A
= +85°C, LOW GAIN
T
A
= +25°C,
HIGH GAIN
T
A
= +25°C, LOW GAIN
4
10
8
6
12
14
18
16
20
2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6
GAIN vs. SUPPLY VOLTAGE
MAX2642/43-08
V
CC
(V)
GAIN (dB)
2
0
-2
-4
T
A
= +85°C, HIGH GAIN
T
A
= -40°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
T
A
= +85°C, LOW GAIN
T
A
= +25°C, LOW GAIN
T
A
= +25°C, HIGH GAIN
0
4
2
8
6
12
10
14
18
16
20
800 840 860 880820 900 920 940 980960 1000
GAIN vs. FREQUENCY
MAX2642/43-09
FREQUENCY (MHz)
GAIN (dB)
MATCHED AT 900MHz
LOW-GAIN MODE
HIGH-GAIN MODE
(9 páginas)
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