Rainbow Electronics MAX844 - Manual (Page 5)

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