Broadband driver for subscriber interface circuit has 2 broadband driver circuits for driving signals in 2 different frequency ranges

摘要

The broadband driver has 2 broadband driver circuits (19,24) for driving signals in 2 different frequency ranges, e.g. for speech signals and DC signals and for HF data signals, at least one of which has a frequency-dependent circuit, for impedance synthesis of a frequency-dependent output impedance which has a different impedance value for each frequency range.