Discrete time amplified charge or voltage sampler with adjustable gain
AssigneeAistorm Inc.
InventorsDavid Jamie Haas, David Schie
Life of this patent
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Abstract
An interface output for a capacitive sensor has a circuit to sample an input signal from the capacitive sensor. The circuit converts the sampled input signal to a digital signal and has an adjustable gain. An analog to digital converter (ADC) of the circuit receives the sampled input signal. An output of the circuit is coupled to the ADC and applies a gain correction to generate an amplified digital output signal.
Claims15
An interface output for a capacitive sensor comprising:
- a circuit to sample an input signal from the capacitive sensor, convert the sampled input signal to a digital signal and having an adjustable gain, wherein circuit comprises:
- an analog to digital converter (ADC) receiving the sampled input signal;
- an output coupled to the ADC applying a gain correction to generate an amplified digital output signal;
- and
- an observer coupled to the capacitive sensor determining a magnitude of amplified sample of the input signal.
A circuit to convert one of a charge or voltage information input from a Micro Electro Mechanical (MEM) capacitive sensor comprising:
- a sampling circuit sampling an input signal from the MEM capacitive sensor and converting the sampled input signal to one of amplified charge or voltage information;
- an analog to digital converter (ADC) receiving the one of amplified charge or voltage information;
- an output device coupled to the ADC applying a gain correction to generate an amplified digital output signal;
- an observer coupled to the sampling circuit determining a magnitude of the one of amplified charge or voltage information and comparing the magnitude of the one of amplified charge or voltage information to threshold window values;
- and
- a controller coupled to the observer generating a gain control output signal to control and adjust a gain of the one of amplified charge or voltage information.
A circuit to convert charge information input from a Micro Electro Mechanical (MEM) capacitive sensor comprising:
- a sampling circuit sampling an input signal from the MEM capacitive sensor and converting the sampled input signal to amplified charge information;
- an analog to digital converter (ADC) receiving the amplified charge information;
- an output coupled to the ADC applying a gain correction to generate an amplified digital output signal;
- and
- an observer coupled to the sampling circuit determining a magnitude of the amplified charge information.
Dependencies are inferred from the claim text.