This document presents an application note by Mark Alexander regarding the design of a current-feedback audio power amplifier. The text introduces this specific topology as a solution to limitations found in traditional voltage feedback designs, such as gain-bandwidth trade-offs and slew rate constraints.
The note provides background on the differences between voltage and current feedback operational amplifiers, explaining why the latter is advantageous for high-performance audio applications. It discusses theoretical analysis, circuit models, and practical considerations necessary for implementing this design.
The amplifier achieves a bandwidth of 1 MHz.
The amplifier has a slew rate of 200 V/us.
Readers are permitted to construct one stereo amplifier for their own personal, noncommercial use.