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US 2004/0061569 A1Published application
ADSL customer premises subscriber loop equalizer
OwnerNaom Chaplikinventor
Life of this patent
Estimating the term…
Abstract
An ADSL subscriber loop equalizer architecture 100 employs a circuit having a capacitor 102 connected to ground as a basic building block; where the capacitor 102 is much smaller than equivalent capacitors that must be employed using known ADSL CP subscriber loop equalizer architectures. The ADSL subscriber loop equalizer is adaptive to provide different levels of equalization in response to a selector switch setting.
Claims11
An ADSL subscriber loop equalizer comprising:
- at least one operational amplifier;
- a resistor network connected to the at least one operational amplifier;
- a selector switch;
- and
- at least one capacitor connected between ground and the resistor network via the selector switch such that the at least one operational amplifier, resistor network and at least one capacitor are configured to provide an ADSL subscriber loop equalizer having a different equalization level associated with each selector switch position and further such that the ADSL subscriber loop equalizer has capacitors substantially smaller than an ADSL subscriber loop equalizer that is devoid of any capacitors connected to ground, and further such that the ADSL subscriber loop equalizer having at least one capacitor connected between ground and the resistor network provides substantially identical gain performance as that provided by the ADSL subscriber loop equalizer that is devoid of any capacitors connected to ground.
2 more elements
An ADSL subscriber loop equalizer comprising:
- at least one operational amplifier;
- a plurality of resistor networks connected to the at least one operational amplifier;
- a selector switch;
- and
- at least one capacitor associated with each resistor network selected from among the plurality of resistor networks, each at least one capacitor connected between ground and its respective resistor network via the selector switch, such that the at least one operational amplifier, plurality of resistor networks and at least one capacitor connected between ground and its respective resistor network are configured to provide an ADSL subscriber loop equalizer a different equalization level associated with each selector switch position and further such that the ADSL subscriber loop equalizer has capacitors substantially smaller than an ADSL subscriber loop equalizer that is devoid of any capacitors connected to ground, and further such that the ADSL subscriber loop equalizer having at least one capacitor connected between ground and each resistor network provides substantially identical gain performance as that provided by the ADSL subscriber loop equalizer that is devoid of any capacitors connected to ground.
2 more elements
A method of providing compensation for an ADSL subscriber loop at high frequencies, the method comprising the steps of:
- providing an adaptive high pass ADSL subscriber loop equalizer having at least one filter capacitor connected to ground via a selector switch such that the ADSL subscriber loop equalizer has a different equalization level associated with each selector switch position;
- and
- processing a signal passing through the high pass ADSL subscriber loop equalizer to reduce its high frequency attenuation.
Dependencies are inferred from the claim text.