okguy said:
You have a design problem. The ratio between M5 and M12 should be an interger number : 7 or 8, not 7.5!
No way to draw a good layout. I suggest you to increase a little your ref resistor to keep the same current in your diff pair and go for a ratio of 8.
Then, your layout becomes : M12,M12,M12,M12,M5,M12,M12,M12,M12 :idea:
Hello, i don't understand what mean "the ratio in interger number:7 or 8, not 7.5!"
and below is the overall circuit, which transistor need to do matching ???
How to see which transistor need to match ??? any rules ???
If PMOS can not match with NMOS, any method to match them?
Can i change the W/L ratio for matching so that the size can match?
For example: orginial is 18u/0.8u = 22.5, can i change to 4.5u/0.2u ?