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MCP661 датащи(PDF) 26 Page - Microchip Technology

номер детали MCP661
подробное описание детали  60 MHz, 6 mA Op Amps
PDF  42 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP661 датащи(HTML) 26 Page - Microchip Technology

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MCP661/2/3/5
DS22194A-page 26
© 2009 Microchip Technology Inc.
This circuit automatically makes the noise gains (GN)
equal, when the gains are set properly, so that the fre-
quency responses match well (in magnitude and in
phase). Equation 4-7 shows how to calculate RGT and
RGB so that both op amps have the same DC gains;
GDM needs to be selected first.
EQUATION 4-7:
Equation 4-8 gives the resulting common mode and
differential mode output voltages.
EQUATION 4-8:
G
DM
V
OT
V
OB
–
V
IN
V
DD 2
⁄
–
--------------------------------
1 V/V
≥
≡
R
GT
R
F
G
DM 2
⁄
() 1
–
---------------------------------
=
R
GB
R
F
G
DM 2
⁄
-------------------
=
V
OT
V
+
OB
2
---------------------------
V
DD
2
-----------
=
V
OT
V
–
OB
G
DM VIN
V
DD
2
-----------
–
⎝⎠
⎛⎞
=



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