A broadband high-voltage SLIC for a splitter- and transformerless combinedADSL-Lite/POTS linecard

A monolithic broadband subscriber line interface circuit (B-SLIC) has been integrated in the Smart Power Technology SPT170B, combining the functionali ty of an analog 150-V ringing SLIC with that of a line driver for ADSL-Lite data signals, Thus the B-SLIC is the key circuit for the realization of a very compact integrated voice data (IVD) central office linecard that neith er needs analog filters ("POTS-splitter") nor transformers or relays. In sp ite of the fundamental voltage/frequency tradeoff, the B-SLIC is able to fe ed high de or ring voltages to the line, while simultaneously acting as voi ce and data transceiver. Total harmonic distortion values are below -60 dB even for a high 25-V-pp/550-kHz sine wave signal into a 200 Omega load; ADS L-signal-based multitone power ratio (MTPR) measurements also yield results better than 60 dB, Power dissipation in simultaneous voice and data operat ion is about 2.2 W.