The class AB input stage in LM7171 is fully symmetrical and has a similar slewing characteristic to a CFA. In the LM7171 simplified schematic, Q1 through Q4 form the equivalent of the current-feedback input buffer, R_E the equivalent of the feedback resistor, and stage A buffers the inverting input. The triple-buffered output stage isolates the gain stage from the load to provide low output impedance.