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US 2019/0377034 A1Published application
Apparatus and method for reducing offsets and 1/f noise
AssigneeCirrus Logic International Semiconductor Ltd.
InventorERIC KIMBALL
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AssigneeCirrus Logic International Semiconductor Ltd.
InventorERIC KIMBALL
Estimating the term…
Switching circuits controllable to force an input into a circuit and to sense a responsively produced output in multiple ways to produce different combinations of positive and negative polarities of a desired signal and of sources of offsets and 1/f noise. The switching circuits are controlled in a non-ordered time sequence of different combinations of positive and negative polarities of the sources of the offsets and 1/f noise that spreads their energy to a frequency range above the desired signal frequency band. The non-ordered time sequence leaves the polarity of the desired signal unchanged. Uncorrelated delta-sigma modulators may generate the control signal. A DSP processes a resulting spectrum of a digital domain version of the sensed output to measure residual offsets and 1/f noise and adds to an input present at the DSMs a signal equal in magnitude and opposite in sign to the measured residual offsets and 1/f noise.
An apparatus for coupling to a circuit that, in response to an input forced into the circuit, produces an output having undesired offsets and 1/f noise from sources and a desired signal, the desired signal having a frequency band, the offsets and 1/f noise having energy, the apparatus comprising:
A method to be performed on an apparatus for coupling to a circuit that, in response to an input forced into the circuit, produces an output having undesired offsets and 1/f noise from sources and a desired signal, the desired signal having a frequency band, the offsets and 1/f noise having energy, the apparatus having switching circuits controllable to force the input into the circuit and to sense the produced output in multiple ways to produce different combinations of positive and negative polarities of the desired signal and of the sources of the offsets and 1/f noise, the method comprising:
Dependencies are inferred from the claim text.