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MCP6231 Datasheet(PDF) 14 Page - Microchip Technology

Part No. MCP6231
Description  20 μA, 300 kHz Rail-to-Rail Op Amp
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6231 Datasheet(HTML) 14 Page - Microchip Technology

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MCP6231/1R/1U/2/4
DS21881E-page 14
© 2009 Microchip Technology Inc.
To minimize output offset voltage and increase circuit
accuracy, the resistor values need to meet the
conditions:
EQUATION 4-3:
4.7.2
COMPENSATING FOR THE
PARASITIC CAPACITANCE
In analog circuit design, the PCB parasitic capacitance
can compromise the circuit behavior; Figure 4-9 shows
a typical scenario. If the input of an amplifier sees
parasitic capacitance of several picofarad (CPARA,
which includes the common mode capacitance of 6 pF,
typical), and large RF and RG, the frequency response
of the circuit will include a zero. This parasitic zero
introduces
gain-peaking
and
can
cause
circuit
instability.
FIGURE 4-9:
Effect of Parasitic
Capacitance at the Input.
One solution is to use smaller resistor values to push
the zero to a higher frequency. Another solution is to
compensate by introducing a pole at the point at which
the zero occurs. This can be done by adding CF in
parallel with the feedback resistor (RF). CF needs to be
selected so that the ratio CPARA:CF is equal to the ratio
of RF:RG.
R
VIN+
R
VIN
=
VOUT
CF
VDC
+
VAC
RG
RF
CPARA
C
F
C
PARA
R
G
R
F
-------
=
MCP623X


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