US 12,431,915 B2 · Adaptive charge measurement circuit for data converters

Abstract

Data converter circuits and methods of operating the data converter circuits are disclosed. In some embodiments, a data converter circuit includes a charge measurement circuit. In some embodiments, the charge measurement circuit is a capacitive transimpedance amplifier (CTIA). In some embodiments, the data converter circuit includes the CTIA, a quantizer, a digital-to-analog converter, a summer, and a digital filter. In some embodiments, the data converter circuit includes an analog-to-digital converter electrically coupled to the CTIA and the digital filter. In some embodiment, a method includes integrating an input signal with a CTIA, determining whether a CTIA output signal is greater than a threshold, and reducing the CTIA output signal or forgoing the reducing based on the determination of whether the CTIA output signal is greater than the threshold.

Claims19

Dependent claims

A circuit, comprising:

an analog input electrically coupled to a sensor;
a charge transimpedance amplifier (CTIA) electrically coupled to the analog input,
wherein the CTIA comprises a feedback capacitor, and
wherein a capacitance of the feedback capacitor is smaller than a capacitance of the sensor;
a quantizer electrically coupled to an output of the CTIA;
a digital-to-analog converter (DAC) electrically coupled to an output of the quantizer;
a summer electrically coupled to an output of the DAC, wherein the CTIA is electrically coupled to an output of the summer;
a digital filter electrically coupled to the output of the quantizer;
and
a digital output electrically coupled to the digital filter.

7 more elements

Dependencies are inferred from the claim text.

Adaptive charge measurement circuit for data converters

Life of this patent

Adaptive charge measurement circuit for data converters

Life of this patent

Abstract

Claims19