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US 2003/0169875 A1Published application
On-chip compensation scheme for bridged tap lines in ADSL hybrid
AssigneeLSI Logic Corporation
InventorsSang-Soo Lee, Hiroshi Kimura, Ju Hi John Hong, Jin-Der Wang, John P. DeCelles, JR., Bryan S. Rowan
Life of this patent
Estimating the term…
Abstract
A modem generally comprising an analog front end circuit, a hybrid circuit, and a variable impedance element. The hybrid circuit may be configured to couple the analog front end circuit to a transmission line. The variable impedance may be disposed within the analog front end circuit and connected to the hybrid circuit to trim an echo cancelling function of the hybrid circuit.
Claims20
A modem comprising:
- an analog front end circuit;
- a hybrid circuit configured to couple said analog front end circuit to a transmission line;
- and
- a variable impedance disposed within said analog front end circuit and connected to said hybrid circuit to trim an echo cancelling function of said hybrid circuit.
1 more element
A circuit comprising:
- a transmit channel connectable to a line driver in a line interface circuit of a modem;
- a receive channel connectable to a line receiver in said line interface circuit;
- and
- a variable impedance connectable to said line interface circuit to trim an echo cancelling function of said line interface circuit.
1 more element
A modem comprising:
- an analog front end circuit;
- means for coupling said analog front end circuit to a transmission line;
- and
- means for trimming an echo cancelling function of said means for coupling disposed within said analog front end circuit.
1 more element
Dependencies are inferred from the claim text.