Table of Contents
Advertisement
Maximum Gain
The maximum gain for a known differential voltage and common
mode voltage can easily be determined using the following set of equations.
Equation 5 calculates the maximum gain based on the positive internal rail
of the amplifier. Equation 6 gives the maximum gain based on the negative
internal rail of the amplifier. Equation 7 calculates the maximum gain
without overflowing the output range of the SDAIBB. The smallest
maximum gain value calculated using these equations is the maximum gain
that may be used.
Equation 4:
G is the gain, V
differential voltage.
Example: Find the maximum allowable gain for a differential voltage of
±10 mV and a common mode voltage of 2.5 V.
From Equation 5:
From Equation 6:
From Equation 7:
The minimum value calculated is 247, so the maximum allowable gain is
247.
SDAIBB1300 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
Equation 2:
G
MAX
Equation 3:
G
max
G
MAX
is the common mode voltage, and V
cm
G
MAX
G
max
G
MAX
2
4
4 .
V
V
CM
V
DIFF
2
V
. 0
59
V
cm
V
DIFF
. 4
94
V
InputRange
2
4
4 .
2
5 .
380
. 0
01
2
2
5 .
. 0
59
618
. 0
01
. 4
94
247
. 0
02
is the
diff
11
Advertisement
Table of Contents
