| 摘要 |
An operational amplifier is provided to provide higher gain amplitude than gain amplitude of a single stage operational amplifier, by including a first current mirror, a second current mirror and a differential pair of transistors. An operational amplifier(22) includes a first current mirror and a second current mirror. A differential pair of transistors are constituted to receive two inputs through the first current mirror and the second current mirror. The first current mirror provides a first current to a first high impedance node, and the second current mirror provides a second current to a second high impedance node. A capacitor is located at the first high impedance node, and adds parasitic capacitance directly at the first high impedance node.
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