| 摘要 |
PROBLEM TO BE SOLVED: To provide an operational amplification circuit that keeps a gain constant over a wide common mode input voltage range.SOLUTION: The operational amplification circuit having an N-MOS differential pair connected to a pair of corresponding voltage input terminals and a P-MOS differential pair connected to the pair of corresponding voltage input terminals, and configuring a rail-to-rail input folded circuit is provided with: an N-MOS auxiliary current source connected in parallel with the N-MOS differential pair, and turned on to apply a current to an active load for the N-MOS differential pair when a common mode input voltage applied to the pair of voltage input terminals rises to turn the N-MOS differential pair off; and a P-MOS auxiliary current source connected in parallel with the P-MOS differential pair, and turned on to draw a current from an active load for the P-MOS differential pair when the common mode input voltage applied to the pair of voltage input terminals drops to turn the P-MOS differential pair off. |
