Hybrid Time-Interleaved ADC for High-Speed Low-Power Conversion
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Solution Overview
Problem
Time-interleaved analog-to-digital converters (ADCs) face challenges with increasing sampling speeds, leading to larger physical dimensions, increased error sources, and higher power dissipation due to the need for a larger number of sub-ADCs.
Innovation Solution
The proposed solution involves a hybrid time-interleaved ADC architecture that includes a fast frontend-ADC (first ADC) to generate coarse M-bit digital values, which are then used by multiple time-interleaved sub-ADCs (second ADC) to generate more accurate B-bit digital values, thereby reducing the number of sub-ADCs required and improving conversion speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the number of sub-ADCs is increased to achieve higher sampling rates, then the sampling speed is improved, but the physical dimension and power dissipation increase
Solution Approach 1:
The ADC is divided into multiple sub-ADCs that operate in a time-interleaved manner, where each sub-ADC handles a portion of the sampling task. This segmentation allows the system to achieve high sampling rates without requiring a single large-scale ADC, thereby reducing the physical dimension while maintaining high speed performance.
Solution Approach 2:
The sub-ADCs operate periodically with alternating activation patterns, where not all sub-ADCs need to be active simultaneously. This periodic operation reduces the number of sub-ADCs required at any given time,ไป่ reducing the physical dimension and power dissipation while maintaining the required sampling rate through time-interleaved operation.
2Speed
If the number of sub-ADCs is increased to achieve higher sampling rates, then the sampling speed is improved, but the power dissipation increases
Solution Approach 1:
The time-interleaved architecture employs periodic activation of sub-ADCs, where subsets of sub-ADCs are activated in alternating time intervals rather than all simultaneously. This periodic operation reduces the average power dissipation while maintaining the required high sampling rate, as fewer sub-ADCs are consuming power at any given moment.
Solution Approach 2:
By segmenting the ADC into multiple sub-ADCs that can operate independently in time-interleaved fashion, the system distributes the sampling load across multiple lower-power units. This segmentation allows the overall system to achieve high sampling rates without the power dissipation of a single high-speed ADC, as each sub-ADC operates at a manageable power level.
3Speed
If the number of sub-ADCs is increased, then the sampling rate is improved, but the number of error sources increases
Solution Approach 1:
The system incorporates feedback mechanisms to monitor and correct errors in the time-interleaved sub-ADCs. By implementing error detection and correction circuits, the system can identify and compensate for mismatches and errors introduced by multiple sub-ADCs, thereby maintaining high reliability despite the increased number of components required for high sampling rates.
Data Source
AI summary
An apparatus for analog-to-digital conversion is provided. The apparatus includes a first analog-to-digital converter (ADC) configured to receive an input signal and convert the input signal to a sequence of M-bit digital values. The apparatus further includes a second ADC including a plurality of time-interleaved sub-ADCs each being configured to receive the input signal and at least one M-bit digital value of the sequence of M-bit digital values. Further, each of the plurality of time-interleaved sub-ADCs is configured to convert the input signal to a respective sequence of B-bit digital values using the at least one M-bit digital value of the sequence of M-bit digital values. M and B are integers with M<B.