High
High
300µA
400µA
0.01µF
0.01µF
20kΩ
20kΩ
100µA
100µA
100µA
2N5116
2N5116
2N4340
2N4340
0.01µF
27kΩ
5
In
4
Out
5
In
4
Out
100µA
Mirror
Com
3
Mirror
Com
3
300µA
Low
400µA
Low
(a) Regulation (15V to 30V = 0.00003%/V (10GΩ)
(a) Regulation (15V to 30V = 0.000025%/V (10GΩ)
FIGURE 16. Floating 300µA and 400µA Cascoded Current Sources.
High
+V
S
Compliance
4V to 30V
25mA
100µA
10kΩ
100Ω
C
10kΩ
V
I
100µA
VO = –VI
OPA602
100Ω
Diodes: 1N4148
or PWS740-3
VO Rate Limit = 100µA/C
Diode Bridge for
reduced VOS
.
100µA
+VS
–V
S
–VS
100Ω
100Ω
FIGURE 17. Rate Limiter.
10kΩ
40.2Ω
NOTE: Each amplifier 1/4 LM324.
Op amp power supplies are derived
within the circuitry, and this quiescent
current is included in the 25mA.
Low
FIGURE 18. 25mA Floating Current Source.
®
12
REF200
BB [ BURR-BROWN CORPORATION ]
