Multi-Channel Signal Sampling via CDM and Delta-Sigma Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for simultaneous sampling of multiple-channel signals require high hardware overhead, including multiple analog-to-digital converters, large sampling capacitors, and high sampling rates, making them inefficient and inaccurate.
Innovation Solution
The method employs code division multiplexing (CDM) modulation to combine multiple input signals into a single analog signal, followed by Delta-Sigma modulation and filtering to achieve high-accuracy simultaneous sampling with reduced hardware overhead, using a single analog-to-digital conversion path and noise shaping to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple ADCs are used for simultaneous sampling of multiple-channel signals, then sampling accuracy is improved, but hardware overhead and chip area increase linearly
Solution Approach 1:
The patent combines multiple input signals into a single signal path using time-interleaved sampling, where multiple ADCs share a common signal path and are coordinated through timing control. This merging approach maintains sampling accuracy while reducing the number of independent ADC channels needed, thereby decreasing hardware overhead and chip area.
Solution Approach 2:
The patent employs time-interleaved sampling where multiple ADCs operate in periodic cycles, each handling specific time slots of the input signals. This periodic operation allows accurate simultaneous sampling of multiple channels while using fewer ADC resources, as each ADC is activated only during its designated time interval rather than continuously operating independently.
2Device complexity
If PTIM is used to use a single ADC for multiple inputs, then hardware overhead is reduced, but large sampling capacitors and multiple sample-and-hold circuits are required
Solution Approach 1:
The patent uses time-interleaved sampling where ADCs operate periodically in alternating time slots. During each period, different ADCs are activated sequentially to sample different input signals. This periodic operation eliminates the need for large sampling capacitors and multiple sample-and-hold circuits, as each ADC only needs to handle its designated time slot with minimal capacitive storage.
3Device complexity
If STIM is used to use a single ADC for multiple inputs, then hardware overhead is reduced, but temporal information is lost and digital calibration is needed
Solution Approach 1:
The patent implements time-interleaved sampling with periodic activation of multiple ADCs in coordinated time slots. Each ADC samples during its assigned period, and the periodic pattern ensures that temporal relationships between signals are preserved. By carefully designing the periodic sampling schedule, the system maintains temporal information integrity without requiring complex digital calibration procedures.
4Device complexity
If FDM or OFDM is used for single ADC conversion, then hardware overhead is reduced, but very high sampling rates are required making oversampling difficult
Solution Approach 1:
The patent uses time-interleaved sampling where multiple ADCs operate periodically at lower individual sampling rates. Instead of requiring a single ADC to operate at a very high sampling rate as in FDM/OFDM, the periodic activation of multiple ADCs in time slots achieves the same multiplexing effect with much lower per-ADC sampling rate requirements, enabling effective oversampling.
Data Source
AI summary
A method, an apparatus and a device for simultaneously sampling multiples signals and a medium are provided. The method includes: modulating multiple target input signals with CDM, to obtain a single target analog signal; performing ΔΣ modulation on the single target analog signal to obtain a target digital bit stream; demodulating the target digital bit stream to obtain a target demodulated bit stream; and filtering the target demodulated bit stream to obtain multiple target output signals. With the method, the hardware overhead for simultaneous sampling of multiple-channel signals is reduced while ensuring accuracy. Accordingly, the apparatus and the device, and the medium have the above beneficial effects.