Low-Noise, Regulated, -2V GaAsFET Bias
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, V
IN
= 3.6V, T
A
= +25°C, unless otherwise noted.)
MAX840/MAX843/MAX844
MAX840 NOISE SPECTRUM
(C1 = C2 = C3 = 1µF, C4 = 10µF)
40
V
IN
= 3.6V,
I
OUT
= 4mA
30
NOISE (dBµV)
20
10
0
-10
0.1
1
10
FREQUENCY (kHz)
100
1000
MAX840 NOISE SPECTRUM
(C1 = C2 = C3 = 0.22µF, C4 = 4.7µF)
50
V
IN
= 3.6V,
I
OUT
= 4mA
40
NOISE (dBµV)
30
20
10
0
0.1
1
10
FREQUENCY (kHz)
100
1000
MAX843/MAX844 NOISE SPECTRUM
(C1 = C2 = C3 = 1µF, C4 = 10µF)
40
V
IN
= 3.6V,
I
OUT
= 4mA
30
NOISE (dBµV)
20
10
0
V
OUT
NOTE: dBµV = 20 LOG ______
1µV
-10
0.1
1
10
FREQUENCY (kHz)
100
1000
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
