直流偏置开启序列的精密定时
Precision Timing of DC Bias Turn-On Sequence
在很多IC[1]和ASIC[2]中,多个电源的开启序列至关重要。同样重要的是,不同电源开启之间的定时。在2600型系列数字源表中,不同电源开启之间延迟的精度受到连续命令行命令执行的限制。要将SMUA[3]与SMUB[4]开启之间的延迟设置为200µs,可能需要以下命令序列:
In many ICs and ASICs, the turn-on sequence of multiple powersupplies is critical. Equally important is the timing betweenthe turn-on of the various supplies. In Series 2600 (non-A)instruments, the precision of the delay between the turn-on ofvarious power supplies was limited by the command executionof sequential command lines. The following command sequence might be used to program a 200µs delay between the turn-on ofSMUA and SMUB:
reset()smua.source.levelv = 0
smub.source.levelv = 0
smua.source.output = smua.OUTPUT_ON
smub.source.output = smub.OUTPUT_ON
smua.source.levelv = 5
delay(200e-6)
smub.source.levelv = 3.5
图3给出在2602型数字源表[5]上执行前述序列的结果。实际延迟接近1.5ms,比预设值多7倍。此外,对于连接至TSP-Link网络的每个节点,命令执行时间也都有所增加。
Figure 3 shows the results of executing the precedingsequence on a Model 2602. The actual delay is nearly 1.5ms,more than 7 times the programmed value. Furthermore, thecommand execution time is multiplied for each node connectedto the TSP-Link network.
图3 2602型数字源表的直流偏置序列。期望延迟是200µs。实际延迟是1.45ms。
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[1] IC http://www.keithley.com.cn/data?asset=50688
[2] ASIC http://www.keithley.com.cn/events/dianziyuanqijianceshi
[3] SMUA http://www.keithley.com.cn/promo/wb/294/download_file/Bipolar_Tran_App.pdf
[4] SMUB http://www.keithley.com.cn/images/promoimages/Ban_2600_04-a.swf/view_swf
[5] 2602型数字源表http://www.keithley.com.cn/data?asset=50688