preethi19
Full Member level 5
matching in layout design
Can anyone pls explain me in a simple gist what is matching in layout design. I used a current mirror and i didnt match the L and W the same for 1 transistor and the other 2 were the same of the total 3 current mirror structure. The reason i did was when i matched them equally the current got copied more that what i was giving also i the circuit to which i was feeding the copied current provided the required results when i tuned this current mirror bu changing the L and W. After all isnt the ultimate aim to copy the current required. Isn't that what current mirrors are used for. But though the result was good my design needed improvement in matching part. so what is matching and why is it important. So is matching more important always than the desired performance results??? And i also got to know matching is not just making the L and W same. I was told something like aspect ratios of this block (having some transistors) is dependent on the other block (with other transistors). can someone pls explain.Thank you!!!
Can anyone pls explain me in a simple gist what is matching in layout design. I used a current mirror and i didnt match the L and W the same for 1 transistor and the other 2 were the same of the total 3 current mirror structure. The reason i did was when i matched them equally the current got copied more that what i was giving also i the circuit to which i was feeding the copied current provided the required results when i tuned this current mirror bu changing the L and W. After all isnt the ultimate aim to copy the current required. Isn't that what current mirrors are used for. But though the result was good my design needed improvement in matching part. so what is matching and why is it important. So is matching more important always than the desired performance results??? And i also got to know matching is not just making the L and W same. I was told something like aspect ratios of this block (having some transistors) is dependent on the other block (with other transistors). can someone pls explain.Thank you!!!
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