參數(shù)資料
型號: AN-5031
廠商: Fairchild Semiconductor Corporation
英文描述: GTLP Power Configuration
中文描述: GTLP電源配置
文件頁數(shù): 2/5頁
文件大?。?/td> 1188K
代理商: AN-5031
www.fairchildsemi.com
2
A
Termination Voltage V
T
(Continued)
Current spikes are also experienced by the termination
voltage supply. The two major factors that affect the value
of this spike are inductance (L) in the transmission line and
the rate at which the current is changing with respect to
time (
I/
t). A Time Domain Reflectometry (TDR) device
can be used to measure the amount of inductance associ-
ated with a given trace. The TDR device can also show the
location of the inductance. Figure 2 shows the current mea-
sured at the output of one of two V
T
regulators (one regula-
tor is at each end of the backplane) while 3 bits are toggling
at a slow rate in a GTLP16T1655. Because of the type of
probe that is used, the DC current level that the signal set-
tles to is not correct. These small spikes should be consid-
ered
when
calculating
power
components.
ratings
for
supply
FIGURE 2. Current Spikes on V
T
when 3 Bits are Simultaneously LOW
V
T
Power Consumption
As previously stated, each bit switching in a GTLP device contributes to the power required from the V
T
source. Figure 3
shows the linear increase in current as a series of bits are pulled LOW.
FIGURE 3. Outputs Switching versus Termination Supply Current
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