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US 10,707,881 B1Granted
Adaptive noise cancellation
OwnerSeydou Ba, Ahmed R. Fridiinventors
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a structure including an adaptive noise canceller circuit which is configured to suppress noise in a feedback sigma-delta modulator circuit and provide real-time tracking of a noise cancellation signal.
Claims15
A structure comprising an adaptive noise canceller circuit which is configured to suppress noise by a feedback delta-sigma modulator circuit and provide real-time tracking of a noise cancellation signal,
- wherein the adaptive noise canceller circuit comprises a priority encoder approximation circuit which is configured to perform a power of 2 operation, and
- the priority encoder approximation circuit comprises a shift circuit, a 2n circuit, and an absolute value circuit.
A circuit comprising:
- a feedback delta-sigma modulator circuit which is configured to calculate a fractional value that includes noise in a digital phase locked loop (DPLL) circuit during calculation;
- and
- an adaptive noise canceller circuit which comprises a priority encoder approximation circuit and is configured to generate a noise cancellation signal to suppress the noise in the DPLL circuit,
- wherein the priority encoder approximation circuit is configured to perform a power of 2 operation, and
- the priority encoder approximation circuit comprises a shift circuit, a 2n circuit, and an absolute value circuit.
2 more elements
A method, comprising:
- generating a noise cancellation signal to suppress noise in a digital phase locked loop (DPLL) circuit;
- and
- providing real time tracking of the noise cancellation signal across different operating conditions to provide continuous suppression of the noise in the DPLL circuit,
- wherein the generating the noise cancellation signal to suppress the noise in the DPLL circuit further comprises:
- receiving the noise;
- performing an absolute value operation on the noise to generate an absolute value signal;
- performing a 2n operation on an absolute value signal to generate a 2n signal;
- shifting the 2n signal to generate a combined shifted signal;
- multiplying the combined shifted signal by a predetermined ratio to generate an output gain;
- and
- generating the noise cancellation signal using the output gain.
8 more elements
Dependencies are inferred from the claim text.