Patent ID: 6281751
Filing Date: 2001-08-28
Classification: H03F

Abstract:
An operational amplifier having a single-ended output and fully-differential input stages, respectively an output connection and first and second input connections, comprising:a first operational amplifier stage including first and second output connections, or first and second intermediate differential nodes, i.e., respectively nodes P and Q;first and second intermediate stage inverting and non-inverting amplifiers connected at their respective inputs to respective ones of inputs P and Q;first and second output transistors connected at a common node, including a single-ended output for said operational amplifier, each of said first and second output transistors having a gate connected to the output of said first and second intermediate stage inverting and non-inverting amplifiers; andfrequency compensating feedback circuitry including a compensation capacitor connected to said single-ended output of the operational amplifier, and further including a current mirror circuit which is connected to a selected one of the first and second intermediate differential nodes P and Q.