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打算实现持续1us的100mA电流源,但DAC建立时间都有1us,如何解决?

Other Parts Discussed in Thread: DAC7811

要给一个阻性(几十欧)元件施加一个20~80mA的电流,测量电压,计算出准确的阻值,由于功耗限制,电流只允许持续1us,本打算使用DAC+运放+晶体管实现电流源,但找了一圈,发现DAC的建立时间通常都在1us以上,再算上运放的建立时间,肯定>1us,请教该如何实现?