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參數(shù)資料
| 型號： | EDGE4707B |
| 英文描述： | Edge4707B PPMU Settling Time & Stability (224k) |
| 中文描述： | Edge4707B PPMU建立時間 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 224K |
| 代理商： | EDGE4707B |
8
TEST AND MEASUREMENT PRODUCTS
www .semtech.com
PMU-A2
Edge4707B PPMU
Settling Time and Stability
Revision 1 / November 8, 2002
high current ranges will be used in a test system. Settling
times with additional compensation capacitor
combinations can be found in Appendix 1.
(Note that as the Force Voltage step size increases, COMP4
makes less difference on settling time in any range. At
the largest step sizes (~5V or larger), the slew time is
long enough for the impedance of the COMP4 capacitor
to become negligible. COMP4 capacitance also makes
no difference in the Force Current mode since it is removed
from the circuit in this mode. This is done because the
source impedance should be as high as possible in the
force current mode, while the source impedance should
be as low as possible in the Force Voltage mode.)
Table 3 shows the 0.1% settling times associated with
various load capacitance on the FORCE output with fixed
compensation capacitor values. As expected, this load
capacitance has a greater effect on the lower current
ranges because of the increased R-C time constant due
to the larger sense resistors. This effect can be reduced
by using a larger COMP4 capacitance in situations which
have large load capacitance on Force.
Table 3. Change in Settling Time with Changing Load
Capacitance (COMP1-2=22pF, COMP4=47pF,
Step Size=10V)
(Side note: The settling time is not increased with IVMON
load capacitance up to 3000pF. This is because the output
impedance of the IVMON output is much less than the
output impedance of the FORCE output.)
Stability
Stability is dependent primarily on having adequate
compensation capacitors in the circuit. The amount of
compensation required for stability is partially dependent
on the amount of capacitance being driven by the driver
amplifier. This includes the capacitance on the FORCE/
SENSE output node as well as the capacitance on E_SN_IN
and E_FC_IN if these are switched in. (See Edge4707B
datasheet for description). With no compensation caps,
the Edge4707B is only stable on Range D, even with very
small output capacitance. Therefore, compensation caps
are required in most applications. However, even with
compensation caps as small as 22pF, the Edge4707B is
stable with a FORCE output load capacitance as large as
1
F. This means that any overshoot and ringing will
eventually settle out. This does not mean that there is no
overshoot or ringing on the output. In fact, as seen above,
there is overshoot and ringing under many different
compensation capacitor and load capacitor combinations.
The amount of ringing on the FORCE output is important
because it is possible that the voltage overshoot when
changing output voltages can go beyond the allowable
voltage range on the DUT, causing stress on the part or
even failure. For instance, when testing input leakage on
a 5V part, it is common to test the leakage at 0V and 5V
only. When changing from one voltage to the other, it is
desirable to keep the overshoot to less than 0.7V to keep
the input voltage from exceeding the maximum allowable
voltage relative to VCC and GND.
Since the Edge4707B forces only relatively low currents
(<10mA), and since most test devices have ESD
protection diodes which can handle much more current
than this for short periods of time, this overshoot will not
be an issue in most cases. This will be especially true
when using the lower current ranges on the Edge4707B.
However, if the DUT is especially sensitive, care must be
taken in selecting the COMP cap values to keep the
overshoot to within acceptable limits.
The amount of overshoot on the FORCE/SENSE output
node is dependent on a number of variables. The sense
resistor value, voltage step size, compensation capacitor
values and load capacitance all influence the amount of
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