RANDOMLY SAMPLING REFERENCE ADC FOR CALIBRATION
First Claim
1. A randomized interleaved analog-to-digital converter comprising:
- two or more analog-to-digital converters to sample, interleaved in time according to a pseudo-randomized sequence, an analog input of the randomized interleaved analog-to-digital converter and generate respective digital outputs;
a digital combiner to combine the respective digital outputs of the two or more analog-to-digital converters to generate a digital output of the randomized interleaved analog-to-digital converter based on the pseudo-randomized sequence;
a reference analog-to-digital converter for randomly sampling the analog input and generating reference digital outputs that are representative of the digital outputs of the two or more analog-to-digital converters; and
calibration logic for measuring interleaving errors of the two-or analog-to-digital converters based on the respective digital outputs of the two-or more analog-to-digital converters and the reference digital outputs.
1 Assignment
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Accused Products
Abstract
Analog-to-digital converters (ADCs) can have errors which can affect their performance. To improve the performance, many techniques have been used to compensate or correct for the errors. When the ADCs are being implemented with sub-micron technology, ADCs can be readily and easily equipped with an on-chip microprocessor for performing a variety of digital functions. The on-chip microprocessor and any suitable digital circuitry can implement functions for reducing those errors, enabling certain undesirable artifacts to be reduced, and providing a flexible platform for a highly configurable ADC. The on-chip microprocessor is particularly useful for a randomized time-interleaved ADC. Moreover, a randomly sampling ADC can be added in parallel to a main ADC for calibration purposes. Furthermore, the overall system can include an efficient implementation for correcting errors in an ADC.
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Citations
20 Claims
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1. A randomized interleaved analog-to-digital converter comprising:
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two or more analog-to-digital converters to sample, interleaved in time according to a pseudo-randomized sequence, an analog input of the randomized interleaved analog-to-digital converter and generate respective digital outputs; a digital combiner to combine the respective digital outputs of the two or more analog-to-digital converters to generate a digital output of the randomized interleaved analog-to-digital converter based on the pseudo-randomized sequence; a reference analog-to-digital converter for randomly sampling the analog input and generating reference digital outputs that are representative of the digital outputs of the two or more analog-to-digital converters; and calibration logic for measuring interleaving errors of the two-or analog-to-digital converters based on the respective digital outputs of the two-or more analog-to-digital converters and the reference digital outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for calibrating a randomized interleaved analog-to-digital converter comprising:
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generating, by a clock generator, first clock signals for controlling two or more analog-to-digital converters of the randomized time-interleaved analog-to-digital converter to sample, interleaved in time according to a pseudo-randomized sequence, an analog input of the randomized time-interleaved analog-to-digital converter; generating, by the clock generator, a second clock signal for controlling a reference analog-to-digital converter for randomly sampling the analog input, wherein, when the reference analog-to-digital converter samples the analog input, one of the two or more analog-to-digital converters is also sampling the analog input at substantially the same time; processing respective digital outputs of the two or more analog-to-digital converters and digital outputs of the reference analog-to-digital converter over a period of time to generate measurements; and determining interleaving errors associated with the two or more analog-to-digital converters based on the measurements. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A randomized converter system on a single chip for converting an analog input to a digital output, the system comprising:
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two or more analog-to-digital converters to sample, interleaved in time according to a pseudo-randomized sequence, the analog input of the randomized converter system and generate respective digital outputs; a reference analog-to-digital converter for sampling the analog input along with one of the two or more analog-to-digital converters at random and generating reference digital outputs; and dedicated logic for recording measurements of digital outputs of the two or more analog-to-digital converters and reference digital outputs of the reference analog-to-digital converter; and an on-chip microprocessor for assisting the randomized converter system based on the measurements. - View Dependent Claims (17, 18, 19, 20)
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Specification