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US 7,254,229 B2Granted
Method and apparatus for an active impedance feedback
AssigneeLegerity, Inc.
InventorRussell Apfel
Life of this patent
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Abstract
A method and apparatus is provided for performing an active impedance feedback. A signal is received. An active feedback synthesis is performed based upon the signal. Performing the active feedback synthesis includes using an active feedback network for conditioning an output signal and performing a signal summation of at least two components of the conditioned output signal for feedback.
Claims30
A method, comprising:
- receiving a signal;
- and
- performing an active feedback synthesis based upon said signal, performing said active feedback synthesis comprising using an active feedback network for conditioning an output signal and performing a signal summation of at least two components of said conditioned output signal for generating a substantially canceled feedback signal.
An apparatus, comprising:
- means for receiving a signal;
- and
- means for performing an active feedback synthesis based upon said signal, performing said active feedback synthesis comprising using an active feedback network for conditioning an output signal and performing a signal summation of at least two components of said conditioned output signal for generating a feedback signal.
An apparatus, comprising:
- a first amplifier to buffer an input signal to generate an output signal;
- and
- an active impedance network to condition said output signal and sum a first component and a second component of said conditioned output signal for generating a substantially canceled feedback signal.
An apparatus, comprising:
- a voltage-to-current signal converter to convert an input voltage signal;
- a first buffer amplifier operatively coupled to said voltage to current signal converter, said first buffer amplifier to receive a converted input signal on a first input terminal and produce a first buffered current signal;
- a first sense resistor operatively coupled with said buffered amplifier;
- a second buffer amplifier operatively coupled to said voltage-to-current signal converter, said second buffer amplifier to receive a converted input signal on a second input terminal and produce a second buffered current signal;
- a second sense resistor operatively coupled with said second buffer amplifier;
- an active feedback impedance network operatively coupled with said first and second sense resistors;
- a first datasense amplifier operatively coupled to said active feedback impedance network and to said first sense resistor, said first datasense amplifier to generate a first component of a feedback signal;
- a second datasense amplifier operatively coupled to said active feedback impedance network and to said second sense resistor, said second datasense amplifier to generate a second component of said feedback signal;
- and
- a summing node for summing said first and second components of said feedback signal to generate a summed feedback signal for feedback into at least one of said first and second buffer amplifiers.
7 more elements
A system, comprising:
- a subscriber line;
- and
- a line card electronically coupled with said subscriber line, said line card being adapted to:
- receive a signal from said subscriber line;
- and
- perform an active feedback synthesis based upon said signal from said subscriber line, performing said active feedback synthesis comprising using an active feedback network for conditioning an output signal and performing a signal summation of at least two components of said conditioned output signal for generating a substantially canceled feedback signal.
3 more elements
A method, comprising:
- receiving a signal;
- and
- determining an output impedance experienced by an output signal;
- providing a feedback impedance for generating a feedback signal, said feedback impedance being proportional to said output impedance;
- canceling a substantial portion of said output signal based upon said feedback impedance to generate a substantially canceled feedback signal;
- and
- providing said substantially canceled feedback signal for feeding back to an input signal.
4 more elements
Dependencies are inferred from the claim text.