Since 1970, the three stage operational amplifier with dominant pole compensation has become the standard basis in amplifier’s architectures. However, during the 1980s and following years the nested differentiating feedback loops (NDFL) concept was introduced by Edward M. Cherry as an attempt to improve the classic power amp performance, mainly distortion caused by class B output stages. The proposal of this work lies on the first part of a comparison between both topologies’ performance in a SPICE based simulator. Most important analyzed parameters are open-loop gain, distortion, transient response, and, of course, stability. In addition, modern semi-conductor devices and improved inner stages are used to make the comparison circuits based on small signal devices such as discrete operational amplifiers.
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