US 12,556,190 B2 · Startup calibration and digital temperature compensation for an open-loop VCO based ADC architecture

Abstract

A digital microphone includes a first modulation path having an input for receiving an analog input signal and an output for generating a first digital signal; a second modulation path having an input for receiving the analog input signal and an output for generating a second digital signal; a summing circuit having a first input for receiving the first digital signal, a second input for receiving the second digital signal, and an output for generating a digital calibration path signal; and a difference circuit having a first input for receiving the first digital signal, a second input for receiving the second digital signal, and an output for generating a digital signal path signal.

Claims15

Dependent claims

A digital microphone comprising:

a first modulation path having an input for receiving an analog input signal and an output for generating a first digital signal;
a second modulation path having an input for receiving the analog input signal and an output for generating a second digital signal;
a summing circuit having a first input for receiving the first digital signal, a second input for receiving the second digital signal, and an output for generating a digital calibration path signal;
and
a difference circuit having a first input for receiving the first digital signal, a second input for receiving the second digital signal, and an output for generating a digital signal path signal,
wherein the output of the summing circuit is energized in a startup calibration mode of operation, and wherein the output of the difference circuit is energized in a normal mode of operation.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/324,846Filed 26 May 2023

Published

US 2024/0396563 A128 Nov 2024

Granted

17 Feb 2026

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

H03M 1/0604
Of deviations from the desired transfer characteristic: at one point, i.e. by adjusting a single reference value, e.g. bias or gain error
H03M 1/1019
At one point of the transfer characteristic, i.e. by adjusting a single reference value, e.g. bias or gain error: by storing a corrected or…
H03M 1/089
Of noise: of temperature variations
H03M 1/1014
Calibration: at one point of the transfer characteristic, i.e. by adjusting a single reference value, e.g. bias or gain error

Startup calibration and digital temperature compensation for an open-loop VCO based ADC architecture

Life of this patent

Startup calibration and digital temperature compensation for an open-loop VCO based ADC architecture

Life of this patent

Abstract

Claims15