Second order audio continuous time delta sigma modulator with resonator
AssigneeSkyworks Solutions, Inc.
InventorsAbhishek Bandyopadhyay, Barkat A. Wani
Life of this patent
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Abstract
There is a presented a system for setting a noise transfer function comprising an input configured to receive an analog signal; a quantizer configured to quantize the analog signal to produce a digital signal; a preamplifier configured to adjust at least the amplitude the analog signal; and a resonator configured to adjust at least the amplitude of the analog signal, an output of the resonator being coupled to an output of the preamplifier, the system providing greater attenuation to the analog signal in a frequency band determined by the preamplifier and the resonator.
Claims20
A system for setting a noise transfer function comprising:
- an input configured to receive an analog signal;
- a quantizer configured to quantize the analog signal to produce a digital signal;
- a preamplifier configured to adjust at least the amplitude the analog signal;
- and
- a resonator configured to adjust at least the amplitude of the analog signal, an output of the resonator being coupled to an output of the preamplifier, the system providing greater attenuation to the analog signal in a frequency band determined by the preamplifier and the resonator.
A system for reducing noise in a frequency band comprising:
- an input configured to receive an analog signal;
- a first summing node coupled to the input configured to sum an output signal and the analog signal;
- a preamplifier coupled to the first summing node and configured to adjust at least the amplitude of the analog signal;
- a quantizer coupled to an output and to the first summing node and configured to produce an output signal based on the analog signal;
- a feed forward block coupled to the preamplifier and configured to adjust at least an amplitude of the analog signal;
- a resonator coupled to the feed forward block and to an output of the preamplifier and configured to provide a resonator signal based on the analog signal to the output of the preamplifier.
A feedback loop circuit having a signal transfer function and a noise transfer function comprising:
- an input configured to receive an input signal;
- a quantizer configured to produce an output signal;
- a feedback line coupled between an output of the quantizer and the input, the feedback line configured to combine the output signal with the input signal to produce a summed signal;
- a preamplifier coupled to the input and configured to receive the summed signal and adjust at least the amplitude of the summed signal;
- and
- a resonator coupled to the output of the preamplifier and configured to provide a resonator signal to the output of the preamplifier.
Dependencies are inferred from the claim text.