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3 Application Circuit
The JFE150EVM may be configured in standard JFET circuits for evaluation. See the
typical applications.
3.1 JFE150 Ultra-Low-Noise Pre-Amp
The default configuration of the JFE150EVM is shown in
on a single supply of VDD = 12 V and VSS = GND. The output voltage, Vout, settles to approximately midsupply
or 6 V, as shown in
Figure
closed-loop circuit is detailed in the
C
10 µF
G
v
in
R
Figure 3-1. Pre-Amp With JFE150 Front End in a Closed-Loop Circuit
SLPU009 – FEBRUARY 2022
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3-1. A theoretical explanation of the preamplifier with a JFE150 front end in a
JFE150 Ultra-Low-Noise- Pre-Amp application
12 V
R
4.02 k
¡
D
I
1.9 mA
¦
DS
D
G
JFE150
+
v
S
gs
-
1 M
¤
G
+
v
R
300
fb
¥
S1
–
70
70
Measured
Simulation
60
50
40
34
1
10
100
Figure 3-2. Gain vs Frequency
Copyright © 2022 Texas Instruments Incorporated
Figure
4-1. The JFE150EVM is configured to operate
C
10 pF
1
R
1 M
¢
1
C
10 µF
D
-
U2 OPA202
+
+
C
2
12 V
6 V
R
10 k
F2
R
10
£
S2
C
1 mF
S
1k
10k
100k
1M
Frequency (Hz)
Application Circuit
JFE150 data sheet
report.
100 nF
+
v
6 V
out
§
-
10M
JFE150 Evaluation Module
for
5
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