Would like help optimizing this circuit. I want the final output to swing from 5V to the positive rail. The gate resistor (R7) is purposely large to limit the output slew. My question involves the input dividers: R3, R4 and R5, R6. As the impedance of R3, R4 increases, the offset from current into the buffer amp decreases, but at some point the input bias current of the error amp will be an issue. Is 170K a reasonable compromise? Then again, without using a negative bias voltage, is this the best configuration to achieve the 5V to positive rail output swing?
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