measure a pico amper

hello pleas attention to bellow figure ... i have problem to maesure curent of vp's drin i will be discirbing the process... in first step vpad = ground , vp = 1 , vn=0 and measure curent of vp's drin in secound step vpad=ground , vp=0 , vn=1 , third step vpad =1 , vp=1 , vn=0 and measure curent of vp's drin ... curent's type is dc and curent's reng is pico amper and period (a in figure)= 100mhz .... now i want to measure this curent at first i found LT1079 but its bandwith is 10khz that is impossible after LT1079 i found LTC6244 ... but LTC6244's bd is 50mhz ... so just help me how i can measure this curent? is there othere device? thanks

http://uupload.ir/files/or4h_axxxxxxxxxx.jpg

by plcs7
October 04, 2018

I don't understand your diagram. It looks to me like an inverter but the waveforms are nothing like. My poor little head can't cope with negative time delays. How is it supposed to work?

by mikerogerswsm
October 04, 2018

hi... it is clearly .... what is negative time?

by plcs7
October 04, 2018

The output to Vapp starts to change at t1, BEFORE the input at Vp changes at t2. I call this negative time.

by mikerogerswsm
October 04, 2018
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