100kΩ
VIN
–10V ≤ V ≤ +10V
IN
C
100µA + Bridge
(See Figure 12)
1/4
OPA404
1/4
OPA404
1/4
OPA404
12Vp-p
100µA + Bridge
(See Figure 12)
Duty Cycle Out
60kΩ
VIN = +10V: 100% Duty Cycle
VIN
=
0V: 50% Duty Cycle
VIN = –10V: 0% Duty Cycle
FIGURE 13. Precision Duty-Cycle Modulator.
For current source,
IOUT
invert circuitry and
IOUT
For current source,
invert circuitry and
use P-Channel FET.
50kΩ
0.1µF
use P-Channel FET.
Siliconix
J109
Siliconix
J109
0.1µF
50kΩ
0.1µF
50kΩ
100µA
100µA
100µA
–15V
–15V
FIGURE 14. Low Noise Current Sink.
FIGURE 15. Low Noise Current Sink with Compliance
Below Ground.
®
11
REF200
BB [ BURR-BROWN CORPORATION ]
