An ADSL central office analog front-end integrating actively-terminated line driver, receiver and filters

摘要

The analog front-end (AFE) of a central office ADSL modem is typically partitioned into two technologies. The data converters, analog filters and sometimes receiver amplifier are fabricated on a 3.3 V or 5 V mixed signal CMOS, while the remainder employs a higher-voltage bipolar process. This circuit has alternative AFE partitioning where the analog filters and receiver amplifier are integrated with the line driver in a 15 V dielectrically-isolated bipolar technology.