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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