The presented IC performs the high-volltage functions of an electronic central office subscriber line interface without the need for any transformers or relays. The challenges of SLIC integration stem from the combination of requirements: 150V supply, 0.2% accuracy and up to 200nF loads, while operating in a harsh environment. A new BCD-process and circuitry that emphasizes the relative merits of the devices (e.g. buffers with DMOS outputs, n-type supply voltage switch, accuracy by polyresistors) yielded a 30mm2 rugged SLIC in the first design step. All transmission specifications are inet without trimming.
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