Interleaving error correction and adaptive sample frequency hopping for time-interleaved analog-to-digital converters
AssigneeMaxim Integrated Products, Inc.
InventorsQian Yu, Shayan Farahvash
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for blind detection and correction of interleaving errors using all-digital processing of data output by multiple sub-ADCs of a time-interleaved ADC are disclosed. The methods and apparatus detect and correct frequency-dependent timing and gain mismatches of the sub-ADCs of the time-interleaved ADC using a novel multiple-input multiple-output (MIMO) filter structure. Additionally, a novel adaptive sampling frequency hopping scheme is proposed to achieve uninterrupted data conversion by the time-interleaved ADC during transient time of ADC clock frequency switching.
Claims18
A multiple-input multiple-output (MIMO) filter comprising:
- a delay line including D delay cells that receives an input signal including M outputs of M sub-analog-to-digital converters (sub-ADCs) of an interleaved ADC, where D and M are integers greater than 1;
- a first selector that selects n of M outputs of a last one of the D delay cells;
- a second selector that selects n of M inputs of a first one of the D delay cells;
- a first multiplexer that multiplexes outputs of the first and second selectors and (D−1) of the D delay cells and that generates N outputs, where N=(D−1)M+2n, and 1≦n≦M;
- a third selector that has M output ports each selecting L of the N outputs, where L=N+1−M;
- M product generators each generating a product of an output of one of the M output ports and a corresponding coefficient;
- a second multiplexer that multiplexes M products of the M product generators and that generates a correction signal to correct errors in the input signal;
- and
- an adder that adds the correction signal to an output of one of the D delay cells to generate a corrected signal.
Dependencies are inferred from the claim text.