MCP6071 Microchip Technology Inc., MCP6071 Datasheet - Page 18

• Manufacturer Part Number: MCP6071
• Description: 110 ?a, High Precision Op Amps
• Manufacturer: Microchip Technology Inc.

MCP6071/2/4
4.7
4.7.1
The MCP6071/2/4 op amps can be used in gyrator
applicaitons. The gyrator is an electric circuit which can
make a capacitive circuit behave inductively.
7
tance, with an approximately equivalent circuit below.
The two Z
The primary application for a gyrator is to reduce the
size and cost of a system by removing the need for
bulky, heavy and expensive inductors. For example,
RLC bandpass filter characteristics can be realized
with capacitors, resistors and operational amplifiers
without using inductors. Moreover, gyrators will typi-
cally have higher accuracy than real inductors, due to
the lower cost of precision capacitors than inductors.
.
FIGURE 4-7:
DS22142A-page 18
shows an example of a gyrator simulating induc-
Z
Z
IN
Z
L
IN
IN
=
=
Application Circuits
R
IN
L
R
GYRATOR
RC
have similar values in typical applications.
L
+
jωL
R
R
L
C
L
Gyrator.
R
L
MCP6071
Equivalent Circuit
Gyrator
Figure 4-
V
OUT
4.7.2
The MCP6071/2/4 op amps are well suited for condi-
tioning sensor signals in battery-powered applications.
Figure 4-8
amplifier, using the MCP6072, that works well for
applications requiring rejection of common mode noise
at higher gains. The reference voltage (V
supplied by a low impedance source. In single supply
applications, V
FIGURE 4-8:
Instrumentation Amplifier.
To obtain the best CMRR possible, and not limit the
performance by the resistor tolerances, set a high gain
with the R
4.7.3
Use high gain before a comparator to improve the
latter’s input offset performance.
gain of 11 V/V placed before a comparator. The
reference voltage V
supply rails.
FIGURE 4-9:
Comparator.
V
V
IN
V
V
REF
2
1
V
OUT
R
100 kΩ
G
1
MCP6071
INSTRUMENTATION AMPLIFIER
PRECISION COMPARATOR
shows a two op amp instrumentation
resistor.
=
REF
(
V
MCP6072
1 MΩ
1
is typically V
R
V
REF
–
2
REF
V
½
Two Op Amp
Precision, Non-inverting
2
R
© 2009 Microchip Technology Inc.
) 1
can be any value between the
⎛
⎝
G
+
R
MCP6541
R
----- -
R
2
1
2
DD
+
/2.
Figure 4-9
2R
-------- -
R
G
1
MCP6072
⎞
⎠
R
+
1
V
½
REF
shows a
V
V
REF
OUT
OUT
) is