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Design >> Analog Design >> help solving short circuit current
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Message started by tenso on Aug 6^th, 2016, 7:50pm

Title: help solving short circuit current
Post by tenso on Aug 6^th, 2016, 7:50pm

Can someone help me figure out how the calculated the short circuit norton current looking into the source node in figure 2 circuit 8 of the article?

http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6841782

I am having trouble understanding how the current was divided between ro and Rd

Title: Re: help solving short circuit current
Post by rajasekhar on Aug 10^th, 2016, 1:53am

HI-
When you apply deltaV at the gate, since you have shorted source you will gm*deltav flowing into the transistor, This will be divided and flow into rO and rD, so find current flowing into Rd which is gm*Ro*deltaV/(R0+Rd).

Please note that short circuit current is same as current flowing through Rd.

If you don't understand this please use simple KVL and KCL, you will the same answer.

Best Regards,
Raj.

Title: Re: help solving short circuit current
Post by tenso on Aug 11^th, 2016, 12:02am

rajasekhar wrote on Aug 10^th, 2016, 1:53am:

Thanks for the help Raj, I get it now.