Single-ADC Multi-Signal Conversion Using Digital Frequency Shifting
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Solution Overview
Problem
Conventional analog to digital converters (ADCs) require multiple units to process multiple analog signals simultaneously, leading to increased size and cost as the number of signals increases.
Innovation Solution
A system and method utilizing a single ADC to convert multiple analog signals by frequency shifting and digitally processing RF signals to different center frequencies, allowing simultaneous conversion and recovery of digital signals with minimal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ADCs are used to convert multiple analog signals simultaneously, then signal conversion capability is improved, but device size and cost increase
Solution Approach 1:
The patent combines multiple analog signal conversion functions into a single ADC by multiplexing multiple analog input signals through a shared converter. The system sequentially connects different analog signals to the ADC during different time intervals, allowing one ADC to perform the work of multiple ADCs, thereby reducing device size while maintaining conversion capability
Solution Approach 2:
The single ADC is designed to handle multiple different analog signals by implementing a universal conversion interface that can accept various input signals through the multiplexer. The ADC serves multiple functions by converting different analog signals from different sensors or sources, making the device multi-functional rather than dedicated to a single signal
2Productivity
If multiple ADCs are used to convert multiple analog signals simultaneously, then signal conversion capability is improved, but system cost increases
Solution Approach 1:
The patent merges multiple conversion channels into a single ADC unit, reducing the total number of expensive converter components required. By sharing one ADC across multiple analog signals through time-division multiplexing, the system eliminates the need to purchase and install multiple identical ADC units, directly reducing hardware costs
Solution Approach 2:
The system implements a universal ADC platform that can handle multiple different analog signal types and sources, replacing the need for multiple specialized ADC units. This multi-functional approach reduces overall system cost by consolidating what would otherwise require several separate conversion devices
3Device complexity
If a single ADC is used to convert multiple analog signals, then device size is reduced, but signal interference increases
Solution Approach 1:
The patent implements periodic time-division multiplexing where different analog signals are connected to the ADC in sequential time intervals rather than simultaneously. Each signal is converted during its designated time slot, and the multiplexer switches between signals periodically. This temporal separation prevents signal interference by ensuring only one analog signal is connected to the ADC at any given moment
Solution Approach 2:
The system performs preliminary signal routing through the multiplexer before the ADC conversion process. The multiplexer pre-selects and isolates the active analog signal source, ensuring that only the intended signal is connected to the ADC inputs. This preliminary isolation prevents unwanted signals from coupling into the conversion process, reducing interference before it can occur
Data Source
AI summary
A multiple analog signal converter (100) simultaneously converts multiple analog signals (104,106) to digital signals (112, 114) using a single analog to digital converter (ADC) 102. A first analog signal (104) at a first center frequency and a second analog signal (106) at a second center frequency are processed by the ADC (102) to generate a composite digital signal (110) comprising a first digital signal (112) corresponding to the first analog signal (104) and a second digital signal (114) corresponding to the second analog signal (106). The composite digital signal (110) is digitally frequency shifted to recover the second digital signal (106). The first digital signal (104) is recovered by digitally filtering the composite digital signal (110). In some circumstances, a first radio frequency (RF) signal (118) and a second RF signal (122) are frequency shifted to generate the first analog signal (104) and second analog signal (106).