Aiming at the problem of poor human auditory sensation caused by the wide range variation of audio signal amplitude, a high-precision and expandable automatic volume control circuit system is designed ...

A small-signal equivalent circuit is developed for the InGaAs/InAlAs/InP collector-up heterojunction bipolar transistor (HBT). Device S-parameters are measured in the 0.05- GHz to 40-GHz range at ...