Datasheet

AD8331/AD8332/AD8334
Rev. G | Page 15 of 56
500
400
300
200
100
0
0 0.2 0.4 0.6 0.8 1.0
OUTPUT-REFERRED NOISE (nV/ Hz)
V
GAIN
(V)
03199-025
HI GAIN
LO GAIN
AD8332
AD8334
AD8331
f = 10MHz
Figure 25. Output-Referred Noise vs. V
GAIN
2.5
2.0
1.5
1.0
0.5
100k 1M 10M 100M
FREQUENCY (Hz)
03199-026
R
S
= 0, R
IZ
= , V
GAIN
= 1V,
HILO = LO OR HI
INPUT-REFERRED NOISE (nV/ Hz)
Figure 26. Short-Circuit, Input-Referred Noise vs. Frequency
100
10
1
0.1
0 0.2 0.4 0.6 0.8 1.0
V
GAIN
(V)
03199-027
R
S
= 0, R
IZ
=  ,
HILO = LO OR HI, f = 10MHz
INPUT-REFERRED NOISE (nV/ Hz)
Figure 27. Short-Circuit, Input-Referred Noise vs. V
GAIN
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
–50 –30 –10 10 30 50 70 90
INPUT-REFERRED NOISE (nV/ Hz)
TEMPERATURE (°C)
03199-028
R
S
= 0, R
IZ
=  ,
V
GAIN
= 1V, f = 10MHz
Figure 28. Short-Circuit, Input-Referred Noise vs. Temperature
10
1
0.1
1 10 100 1k
SOURCE RESISTANCE ()
03199-029
f = 5MHz, R
IZ
=  ,
V
GAIN
= 1V
R
S
THERMAL NOISE
ALONE
INPUT-REFERRED NOISE (nV/ Hz)
Figure 29. Input-Referred Noise vs. R
S
7
6
5
4
3
2
1
0
50 100 1k
NOISE FIGURE (dB)
SOURCE RESISTANCE ()
03199-030
INCLUDES NOISE OF VGA
R
IN
= 50
R
IN
= 75
R
IN
= 100
R
IN
= 200
R
IZ
= 
SIMULATED RESULTS
Figure 30. Noise Figure vs. R
S
for Various Values of R
IN