An Impulse Response Comparison of Wide Bandpass Amplifiers

The impulse response characteristics of six wide bandpass amplifiers were compared. Each amplifier was a cascade of six single-tuned stages of maximally-flat amplitude, synchronous-tuned or flat-delay types. All of the amplifiers had the same midband gain, so that the bandwidths were in proportion to the gainbandwidth factor of the tuning scheme employed. The flat-delay amplifiers exhibited faster recovery from impulsive excitation than either the maximally-flat amplitude amplifiers with their greater 3-db bandwidths, or the synchronoustuned amplifier with its greater stage damping. A brief discussion of amplifier design is included.