Time-interleaved ADCs with programmable phases
AssigneeAnalog Devices, Inc.
InventorSiddharth Devarajan
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Abstract
A time-interleaved analog-to-digital converter (ADC) uses M analog-to-digital converters to sample an analog input signal to produce digital outputs. The M ADCs, operating in a time-interleaved fashion, can increase the sampling speed several times compared to the sampling speed of just one ADC. The time-interleaved ADC can be programmed and reconfigured to trade one performance metric for another. For example, more time can be given to comparator to improve bit error rate or more time can be given to an amplifier for improved settling which improves SNR, SFDR etc. If the time-interleaved converters are randomized, then the amount of ‘color’ in the noise floor shape can also be traded for other performance metrics.
Claims20
A programmable time-interleaved analog-to-digital converter comprising:
- a plurality of analog-to-digital converters, wherein sampling instants of the analog-to-digital converters are interleaved in time and each analog-to-digital converter performs conversion of an analog input signal in a plurality of phases;
- and
- a phase controller to adjust a number of cycles allotted for one or more phases.
A method for configuring a time-interleaved analog-to-digital converter, the method comprising:
- receiving a signal indicating a mode of operation for the time-interleaved analog-to-digital converter;
- and
- generating control signals to a plurality of analog-to-digital converters of the time-interleaved analog-to-digital converter according to the mode of operation, wherein the control signals control how long a given analog-to-digital converter in the time-interleaved analog-to-digital converter is busy when the given analog-to-digital converter has been selected to sample an analog input signal.
An apparatus for configuring a time-interleaved analog-to-digital converter, the apparatus comprising:
- means for receiving a signal indicating a mode of operation for the time-interleaved analog-to-digital converter comprising at least three plurality of analog-to-digital converters;
- and
- means for changing, based on the mode of operation, a number of analog-to-digital converters that is available for selection to sample an analog input signal for a given time while one or more other analog-to-digital converters are performing conversion of the analog input signal.
Dependencies are inferred from the claim text.