Analog-to-digital converter and semiconductor integrated circuit

摘要

A time-interleaved analog-to-digital converter that samples an analog input signal at a sampling frequency and converts the analog input signal into a digital output signal is enabled to perform correction processing on an error by: converting the analog input signal into the digital output signal by a plurality of analog-to-digital conversion circuits in a time-interleaved manner; and performing gain correction processing and skew correction processing with respect to the analog-to-digital conversion circuit, on the basis of a mixed signal, the mixed signal being obtained by mixing an output signal from the analog-to-digital conversion circuit with a signal made by shifting a phase of the output signal by π/2.

主权项

1. An analog-to-digital converter configured to sample an analog input signal at a sampling frequency and to convert the analog input signal into a digital output signal, the analog-to-digital converter comprising:
a plurality of analog-to-digital conversion circuits configured to convert the analog input signal into the digital output signal in a time-interleaved manner; and a correction circuit configured to perform gain correction processing with respect to the analog-to-digital conversion circuit, on the basis of a mixed signal, the mixed signal being obtained by mixing an output signal from the analog-to-digital conversion circuit with a signal made by shifting a phase of the output signal by π/2, wherein the correction circuit includes a gain correction circuit configured to detect a gain correction value on the basis of the mixed signal, and to perform correction processing on a gain error between the plurality of analog-to-digital conversion circuits, on the basis of the gain correction value.