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MCP6244-E/MS 데이터시트(PDF) 14 Page - Microchip Technology

부품명 MCP6244-E/MS
상세설명  50 關A, 550 kHz Rail-to-Rail Op Amp
PDF  38 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP6244-E/MS 데이터시트(HTML) 14 Page - Microchip Technology

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MCP6241/1R/1U/2/4
DS21882D-page 14
© 2008 Microchip Technology Inc.
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.
VOUT
CF
VDC
+
–
VAC
RG
RF
CPARA
C
F
C
PARA
R
G
R
F
-------
•
=
MCP624X



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