US 12,689,386 B2 · TI ADC time skew background calibration using the complex derivative signal

Abstract

Disclosed is a circuit including timer interleaved (TI) analog-to-digital converter (ADC) circuitry which generates digital output signals. Correction circuitry receives the digital output signals from the TI ADC circuitry and generates corrected output signals using weight values to correct time skew. The correction circuitry includes a derivative filter which removes frequency dependency between the weight values and input signals to the TI ADC circuitry. Weight updating circuitry receives the corrected output signals and generates updated weight values for the correction circuitry. The weight updating circuitry includes a notch filter which suppresses spectral content in the corrected output signals to cancel spurious correlations in the weight updating process.

Claims20

Dependent claims

A circuit comprising:

time-interleaved (TI) analog-to-digital converter (ADC) circuitry configured to receive input signals and to responsively generate digital output signals;
correction circuitry configured to receive the digital output signals from the TI ADC circuitry and to responsively generate a corrected output signal using weight values, the correction circuitry including a first derivative filter;
and
weight updating circuitry configured to receive the corrected output signal and to responsively generate updated weight values, the weight updating circuitry including a notch filter configured to filter the corrected output signal to generate filtered corrected output signals, the weight updating circuitry further configured to generate the updated weight values using the filtered corrected output signals.

1 more element

A circuit comprising:

time-interleaved (TI) analog-to-digital converter (ADC) circuitry configured to receive input signals and to responsively generate digital output signals, the TI ADC circuitry providing sequentially generated outputs of ‘M’ ADC channels, where fs is a sampling frequency;
correction circuitry configured to receive the digital output signals from the TI ADC circuitry and to responsively generate a corrected output signal using complex weight values, the correction circuitry including a first derivative filter configured to generate a derivative of the digital output signals, wherein the corrected output signal is generated based upon the derivative of the digital output signals;
and
weight updating circuitry configured to receive the corrected output signal and to responsively generate updated complex weight values to replace the complex weight values for use by the correction circuitry.

1 more element

Dependencies are inferred from the claim text.

TI ADC time skew background calibration using the complex derivative signal

Life of this patent

TI ADC time skew background calibration using the complex derivative signal

Life of this patent

Abstract

Claims20