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Semiconductor Industry Driven By ADSL Adoption

ADSL technology is rapidly being adopted by various internet service providers (ISP), local exchange carriers (LEC) and regional Bell operating companies (RBOC) for the purpose of providing high-speed data communications over twisted-pair phone lines. Continuous growth of the Internet has placed new demands for lower cost, higher bandwidth, improved power efficiency and longer reach, squarely on the semiconductor manufacturers whose integrated circuits drive ADSL modem technology. ADSL technology offers significant improvements in data transmission compared to purely analog modems by combining sophisticated digital signal processing (DSP) with a high-performance analog interface.

The bridge between the analog signals that ride on telephone lines and the sophisticated DSPs that manage the data contained in them is known as a bridge hybrid. The following paragraphs describe some of the challenges in designing xDSL bridge hybrids where high fidelity Discrete Multi-Tone (DMT) analog signals are being processed over phone lines whose characteristics vary widely from one subscriber line to another. Analog Devices has an ongoing commitment to the development of innovative line drivers, receivers and chip set solutions to implement advanced amplifiers in optimized bridge hybrid circuits.

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