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参数资料
| 型号： | E4707B-EDGE4707B |
| 英文描述： | Quad Channel Per-Pin Precision Measurement Unit |
| 中文描述： | 四通道按针脚精密测量单元 |
| 文件页数： | 5/25页 |
| 文件大小： | 194K |
| 代理商： | E4707B-EDGE4707B |
13
Revision 3 / December 18, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge4707B
Maximum Input Voltage Range for FV Mode
In order to ensure that the full-scale output voltage range
(FSV) can be achieved by the 4707B, errors such as gain,
linearity, and offset must be taken into account when
determining the input voltage range required at VINP. The
equations in Table 10 can be used to determine the input
voltage range required at VINP to achieve full scale voltage
(FSV) at the FORCE pin.
Table 10.
Example: If it is desired to operate the 4707B with a FV
range of –2V to 13V, the VINP input voltages in Table 11
may be required.
Table 11.
P
N
I
VE
C
R
O
F
V
3
.
3
1V
3
1
+
V
3
1
.
2
–
V
2
–
)
e
s
a
C
t
s
r
o
W
(
P
N
I
VE
C
R
O
F
V
S
F
n
i
a
G
V
+
S
O
r
o
r
E
y
t
i
r
a
e
n
I
L
+V
S
F
+
V
S
F
–
n
i
a
G
V
+
S
O
r
o
r
E
y
t
i
r
a
e
n
I
L
+V
S
F
–
Application Information (continued)
Calibration
In order to attain a high degree of accuracy in a typical
ATE application, offset and gain errors are accounted for
through software calibration.
When operating the
Edge4707B in the Measure Current (MI) or Force Current
(FI) modes, an additional source of error, common mode
error, should be accounted for. Common mode error is a
measure of how the common mode voltage, VCM, at the
input of the current sense amplifier affects the forced or
measured current values (see Figure 4). Since this error
is created by internal resistors in the current sense
amplifier, it is very linear in nature.
Using the common mode error and common mode linearity
specifications, one can see that with a small number of
calibration steps (see Applications note PMU-A1), the
effect of this error can be significantly reduced.
Figure 4. Graphical Representation
of Common Mode Error
CM Error = Slope
CM Linearity
VOS @ IVMON
MI Common Mode Error
VCM @ FORCE
19.5 mV
2 mV
–2 mV
–3 mV
VEE + 4.25
VCC – 4.25
NOTE: In some cases, slope may be negative.
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