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OP177FSZ Datasheet(PDF) 12 Page - Analog Devices

Part # OP177FSZ
Description  Ultraprecision Operational Amplifier
PDF  16 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

OP177FSZ Datasheet(HTML) 12 Page - Analog Devices

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OP177
Rev. E | Page 12 of 16
PRECISION POSITIVE PEAK DETECTOR
In Figure 31, CH must be polystyrene, Teflon®, or polyethylene
to minimize dielectric absorption and leakage. The droop rate is
determined by the size of CH and the bias current of the AD820.
PRECISION THRESHOLD DETECTOR/AMPLIFIER
In Figure 32, when VIN < VTH, amplifier output swings negative,
reverse biasing diode D1. VOUT = VTH if RL = ∞. When VIN ≥
VTH, the loop closes.
()
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
−
+
=
S
F
TH
IN
TH
OUT
R
R
V
V
V
V
1
CC is selected to smooth the response of the loop.
–
+
OP177
0.1µF
+15V
RS
1kΩ
R1
2kΩ
RF
100kΩ
0.1µF
–15V
2
3
7
6
4
CC
D1
1N4148
VOUT
VTH
VIN
Figure 32. Precision Threshold Detector/Amplifier



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