A design methodology for audio amplifiers with no global negative feedback: proposal and validation

This paper proposes a structured methodology for the design of high-performance audio amplifiers without use global negative feedback. type amplifier is being suggested in order to minimize supposed deleterious effects on quality. The proposed uses minimum number stages with local feedback operating high voltage range harmonic distortion need As an example applying methodology, 50W power designed and built. In this example, three are used field effect transistors symmetrical }90V gain }45V output stage. practical results obtained satisfied requirements, such as: Slew Rate above 3.6V/μs (14V/μs), Upper Cutoff Frequency 40kHz (125kHz), THD+N below 0.5% (0.2%). Also, ensure that has good linearity, IMD intermodulation was measured. value −62.5dB obtained. way, effectiveness method proven.