DamonKim
Newbie level 2
Hi
I started to design a simple differential amplifier using cadence spectre.
I made an amplifier under low power condition.
So, input devices are in subthreshold.
I got the operating operating point shown below.
But, when I tried tran simulation, I got the gain lower than unity.
It's much smaller than I expected by hand calculation.
I want to know how to deal with this situation.
I expected gain by gm*(Ron || Rop) and it's bigger than 10 at least.
please help me.
I started to design a simple differential amplifier using cadence spectre.
I made an amplifier under low power condition.
So, input devices are in subthreshold.
I got the operating operating point shown below.
But, when I tried tran simulation, I got the gain lower than unity.
It's much smaller than I expected by hand calculation.
I want to know how to deal with this situation.
I expected gain by gm*(Ron || Rop) and it's bigger than 10 at least.
please help me.