The class AB input stage in the LM6171 is fully symmetrical and has a similar slewing characteristic to the current feedback amplifiers. In the Section 6.2, Q1 through Q4 form the equivalent of the current feedback input buffer, R_E forms 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.