Patent ID: 6823028
Filing Date: 2004-11-23
Classification: H03G,H04L

Abstract:
For use in a transceiver capable of operating in a high frequency Ethernet local area network (LAN), wherein the transceiver comprises front-end analog signal processing circuitry capable of at least one of: 1) transmitting an outgoing analog signal to an external cable via a transformer, 2) reducing a DC component in an incoming analog signal, and 3) reducing an echo of the outgoing analog signal in the incoming analog signal, and wherein the front-end analog signal processing circuitry comprises an automatic gain control (AGC) circuit capable of amplifying the incoming analog signal by an adjustable gain factor, an AGC controller comprising:a first circuit capable of determining an absolute value of an output signal of said front-end signal processing circuitry; comparison circuitry capable of comparing said absolute value of said output signal to a pre-determined threshold value and generating a gain control signal in response to said comparison, wherein said comparison circuitry sets said gain control signal to a first gain control value when said absolute value exceeds said pre-determined threshold value and sets said gain control signal to a second gain control signal when said absolute value does not exceed said pre-determined threshold value; and a gain adjustment circuit capable of modifying said adjustable gain factor of said AGC circuit according to said first gain control value and said second gain control value.