US 11,831,325 B2 · Homogeneity enforced calibration for pipelined ADC

Abstract

A method of operating a pipelined analog-to-digital converter (ADC) having a plurality of output stages includes: performing a first calibration process for the pipelined ADC to update a parameter vector of the pipelined ADC, where components of the parameter vector are used for correcting nonlinearity of the pipelined ADC, where performing the first calibration process includes: providing an input signal to the pipelined ADC; converting, by the pipelined ADC, the input signal into a first digital output; providing a scaled version of the input signal to the pipelined ADC, where the scaled version of the input signal is generated by scaling the input signal by a scale factor; converting, by the pipelined ADC, the scaled version of the input signal into a second digital output; and calibrating the pipelined ADC using the first digital output and the second digital output.

Claims20

Dependent claims

A method of operating a pipelined analog-to-digital converter (ADC) having a plurality of output stages, the method comprising:

performing a first calibration process for the pipelined ADC to update a parameter vector of the pipelined ADC, wherein components of the parameter vector are used for correcting nonlinearity of the pipelined ADC, wherein performing the first calibration process comprises:
providing an input signal to the pipelined ADC;
converting, by the pipelined ADC, the input signal into a first digital output;
providing a scaled version of the input signal to the pipelined ADC, wherein the scaled version of the input signal is generated by scaling the input signal by a scale factor;
converting, by the pipelined ADC, the scaled version of the input signal into a second digital output;
and
calibrating the pipelined ADC using the first digital output and the second digital output.

4 more elements

An analog-to-digital converter system comprising:

an input terminal configured to receive an input signal;
a pipelined analog-to-digital converter (ADC);
a first path between the input terminal and the pipelined ADC, wherein when selected, the first path couples the input terminal to the pipelined ADC;
a second path between the input terminal and the pipelined ADC, wherein the second path comprises a scaling circuit configured to scale a signal by a scale factor, wherein when selected, the second path sends a scaled version of the input signal to the pipelined ADC;
selection circuits configured to select the first path or the second path based on a control signal of the analog-to-digital converter system;
and
a correction circuit configured to generate a first corrected output for the pipelined ADC based on a first digital output of the pipelined ADC, wherein the first digital output is an output of the pipelined ADC when the first path is selected.

4 more elements

Dependencies are inferred from the claim text.

Homogeneity enforced calibration for pipelined ADC

Life of this patent

Homogeneity enforced calibration for pipelined ADC

Life of this patent

Abstract

Claims20