US 10,895,932 B1 · Drift invariant processing

Abstract

Improved sensing can include modified sampling and/or processing to improve performance against noise due to environmental variations and interference. In some examples, improved interference rejection can be achieved by sampling a sensor multiple times during settled periods. In some examples, the excitation signal and sampling window can be dynamically adjusted to satisfy drift and/or interference specifications based on various operating conditions or the operating environment. In some examples, drift performance can be traded off to improve interference performance. In some examples, improved immunity to environmental variations can be achieved by equalizing sensor outputs in accordance with characterization of the sensing system. In some examples, improved performance can be achieved by sampling the sensor continuously and using an optimized window function to improve performance against noise.

Claims26

Dependent claims

An apparatus comprising:

a switched capacitor sensor;
and
a receiver channel coupled to an output of the switched capacitor sensor, the receiver channel comprising:
an equalizer configured to apply a transform to the output signal of the switched capacitor sensor to reduce drift at the output of the switched capacitor sensor;
an analog-to-digital converter configured to sample transformed output signal of the equalizer;
and
a processor configured to window a plurality of samples continuously sampled by the analog-to-digital converter from the output signal of the switched capacitor sensor with a tailored window, the tailored window generated based on a characterization of a sensor response under multiple operating conditions.

4 more elements

Dependencies are inferred from the claim text.

Drift invariant processing

Life of this patent

Drift invariant processing

Life of this patent

Abstract

Claims26