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MCP6271-E/MS bảng dữ liệu(PDF) 16 Page - Microchip Technology

tên linh kiện MCP6271-E/MS
Giải thích chi tiết về linh kiện  170 關A, 2 MHz Rail-to-Rail Op Amp
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MCP6271/1R/2/3/4/5
DS21810F-page 16
© 2008 Microchip Technology Inc.
4.9
Application Circuits
4.9.1
ACTIVE FULL-WAVE RECTIFIER
The MCP6271/1R/2/3/4/5 family of amplifiers can be
used in applications such as an Active Full-Wave
Rectifier or an Absolute Value circuit, as shown in
Figure 4-8. The amplifier and feedback loops in this
active voltage rectifier circuit eliminate the diode drop
problem that exists in a passive voltage rectifier. This
circuit behaves as a follower (the output follows the
input) as long as the input signal is more positive than
the reference voltage. If the input signal is more
negative than the reference voltage, however, the
circuit behaves as an inverting amplifier. Therefore, the
output voltage will always be above the reference
voltage, regardless of the input signal.
FIGURE 4-8:
Active Full-wave Rectifier.
The design equations give a gain of ±1 from VIN to
VOUT, and produce rail-to-rail outputs.
4.9.2
LOSSY NON-INVERTING
INTEGRATOR
The non-inverting integrator shown in Figure 4-9 is
easy to build. It saves one op amp over the typical
Miller integrator plus inverting amplifier configuration.
The phase accuracy of this integrator depends on the
matching of the input and feedback resistor-capacitor
time constants. RF makes this a lossy integrator (it has
finite gain at DC), and makes this integrator stable by
itself.
FIGURE 4-9:
Non-Inverting Integrator.
–
+
–
+
VIN
VOUT
VREF
VREF
R1
R3
R4
R5
R2
Op Amp A
Op Amp B
D1
D2
VREF
VREF
time
time
Input
Output
R
5
R
2R4
2R
3
------------
=
R
1
R
2
R
3
==
1/2
MCP6272
1/2
MCP6272
R
4
R
3
<1
V
D1
V
REF
V
SS
–
----------------------------
–
⎝⎠
⎛⎞
+
_
C1
C2
R1
R2
VIN
VOUT
RF
V
OUT
V
IN
-------------
1
sR
1C1
()
--------------------
f
1
2
πR
1C1 1
R
F R2
⁄
+
()
---------------------------------------------------
≈
,
≈
MCP6271
R
F
R
2
≈
R
1C1
R
2||RF
()C
2
=
C2



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