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Analysis of Two-Pole Compensation in Linear Audio Amplifiers

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An analysis of the two-pole compensation technique used in three-stage linear audio amplifiers is presented. An expression for the loop gain of a linear amplifier incorporating two-pole compensation is derived, allowing the designer to easily select the unity loop gain frequency and zero location by choosing appropriate values for the compensation components. Also presented is a simulation method that allows the designer to observe an amplifier’s closed-loop and loop gain responses in a single pass without requiring modification to the circuit’s feedback path; and two separate modifications to the usual two-pole compensation approach which improve phase margin and significantly enhance negative-rail power-supply rejection ratio.

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