Patent ID: 7583797
Filing Date: 2009-09-01
Classification: H04L

Abstract:
1. An analog front end for a digital subscriber line (DSL) modem, the analog front end comprising: a single-ended receive channel configured to receive and process a differential input signal from a twisted pair telephone line that has been converted to a single-ended input signal; a single-ended transmit channel; a converter configured to convert the differential input signal from the twisted pair telephone line to the single-ended input signal for the receive channel, and convert a single-ended output signal from the transmit channel to a differential output signal for transmission on the twisted pair telephone line; an automatic gain control amplifier having a single-ended input coupled to the single-ended receive channel, and a single-ended output, wherein the automatic gain control amplifier is configured to receive an automatic gain control signal; a single-ended first filter coupled to the automatic gain control output; and a single-ended second filter coupled to the transmit channel for filtering the single-ended output signal before conversion to the differential output signal for transmission on the twisted pair telephone line.