questions about mos ratio

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smilelangjun

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In theory, with a preconditon of big area, the op's input pair should have a big ratio,and the current mirror mos should have a small ratio, in order to minimize the offset voltage.
But i have seen the photoes of ADI'schip, the condition is just opposit, can anybody tell me why? Did they make a mistake?
thanks a lot.
 

the I/O devices can have low ratios but the gate oxide of I/O devices are bigger than the other transistors on the chip.
 

thank you, but I was talking about the inner circuit in the chip, not IO devices.
 

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