Time-interleaved analog-to-digital converter

A time-interleaved analog-to-digital (AD) converter comprising:

• N AD converters that each convert an analog input voltage into a digital output value, N representing an integer equal to or larger than two;
• a frequency divider that receives a clock signal and applies 1/N frequency division to the received clock signal to generate N frequency-divided clock signals;
• at least (N−1) variable delay circuit that adjusts delay time for at least (N−1) frequency-divided clock signal included in the N frequency-divided clock signals to be supplied to the N AD converters;
• a low pass filter circuit that is composed of one or more passive elements, receives the clock signal, and limits a frequency band of the received clock signal to generate a reference signal;
• and
• a control circuit that controls the delay time of the at least (N−1) variable delay circuit, and decreases one or more differences among digital output values output from the N AD converters when the reference signal is input to the N AD converters.

A time-interleaved analog-to-digital (AD) converter comprising:

• N AD converters that each convert an analog input voltage into a digital output value, N representing an integer equal to or larger than two;
• a frequency divider that receives a clock signal and applies 1/N frequency division to the received clock signal to generate N frequency-divided clock signals;
• at least (N−1) variable delay circuit that adjusts delay time for at least (N−1) frequency-divided clock signal included in the N frequency-divided clock signals to be supplied to the N AD converters;
• an input buffer circuit that receives the clock signal, and limits a frequency band of the received clock signal to generate a reference signal;
• an adjust circuit that adjusts an amplitude and a common potential of the clock signal to be received by the input buffer circuit;
• and
• a control circuit that controls the delay time of the at least (N−1) variable delay circuit, and decreases one or more differences among digital output values output from the N AD converters when the reference signal is input to the N AD converters.