Back to results
US 7,352,246 B2Granted
Noise-shaping amplifier with waveform lock
AssigneeCirrus Logic, Inc.
InventorsBabak Mazda, Farzad Sahandiesfanjani, Adya S. Tripathi
Life of this patent
Estimating the term…
Abstract
A generalized amplifier architecture is described which employs noise-shaping feedback, and for which the output waveform closely resembles the input waveform.
Claims13
A signal processing circuit characterized by an operating frequency, the circuit comprising:
- a frequency selective network operable to receive an input signal characterized by an input frequency;
- a sampling stage operable to sample an output of the frequency selective network;
- a power amplification stage operable to amplify an output of the sampling stage;
- at least one internal feedback path from the output of the sampling stage to the frequency selective network, each internal feedback path being part of a corresponding internal loop;
- and
- at least one external feedback path from an output of the power amplification stage to the frequency selective network, each external feedback path being part of a corresponding external loop;
- wherein delays associated with the internal and external loops are selected such that the operating frequency is locked to the input frequency during operation of the circuit.
4 more elements
A signal processing circuit characterized by an operating frequency, the circuit comprising:
- a frequency selective network operable to receive an input signal characterized by an input frequency, the frequency selective network comprising a plurality of integrator stages;
- a sampling stage operable to sample an output of the frequency selective network;
- a power amplification stage operable to amplify an output of the sampling stage;
- at least one internal feedback path from the output of the sampling stage to the frequency selective network, each internal feedback path comprising a resistor and a capacitor, and being part of a corresponding internal loop;
- and
- at least one external feedback path from an output of the power amplification stage to the frequency selective network, each external feedback path being part of a corresponding external loop, at least one external loop including a delay element;
- wherein the resistor, the capacitor, and the delay associated with the delay element are selected such that the operating frequency is locked to the input frequency during operation of the circuit.
4 more elements
Dependencies are inferred from the claim text.