Radiation-Tolerant ADDA RF Transceiver ASIC for Low-SWaP Satellites
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Solution Overview
Problem
Current satellite down-converters and up-converters are bulky, power-intensive, and prone to reliability issues due to high part counts, making them difficult to manufacture and test, and are vulnerable to radiation effects that can cause single event effects, total ionizing dose, and displacement damage, leading to operational failures.
Innovation Solution
An integrated analog-to-digital (AD) and digital-to-analog (DA) RF transceiver is developed, featuring radiation-tolerant high-speed ADC and DAC units, digital signal processing cores, and a digital frequency synthesizer, which replaces conventional analog RF conversion circuitry, reducing power consumption and part count while enhancing reliability and radiation hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional analog RF down and up conversion circuitry is used, then frequency conversion functionality is achieved, but power consumption is high and device mass is large
Solution Approach 1:
The patent replaces analog RF conversion circuitry with a fully digital architecture consisting of ADCs, DSP cores, and DACs. This substitution of analog mechanical/electrical systems with digital systems achieves both reduced power consumption and improved reliability, as digital circuits are more radiation-tolerant and can be manufactured with higher integration
Solution Approach 2:
The patent integrates multiple previously separate functions (frequency downconversion, digital signal processing, frequency upconversion) into a single integrated circuit device. This merging reduces the overall system power consumption while improving reliability through reduced interconnections and higher integration
2Device complexity
If conventional analog RF conversion circuitry with mixers and oscillators is used, then frequency conversion is achieved, but device complexity and part count increase
Solution Approach 1:
The patent replaces complex analog components (mixers, oscillators, filter banks) with digital equivalents (ADCs, DSP cores, DACs). This substitution simplifies the overall device architecture while improving reliability, as digital circuits are less susceptible to radiation effects and can be manufactured with higher precision
Solution Approach 2:
The integrated circuit is designed to perform multiple functions (downconversion, upconversion, filtering, signal processing) within a single device. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while maintaining or improving reliability
3Ease of manufacture
If conventional analog RF circuitry is used, then frequency conversion functionality is provided, but manufacturing and testing difficulty increase
Solution Approach 1:
The patent replaces analog RF circuitry with digital circuits that are inherently more tolerant to radiation effects. Digital circuits can be manufactured with standard CMOS processes and are less susceptible to single-event effects, making them easier to manufacture with consistent quality and simpler to test
Solution Approach 2:
The patent changes the operating parameters from analog continuous signals to digital discrete signals. This parameter change makes the system more robust against radiation-induced variations, as digital circuits have defined threshold levels that provide noise margins and tolerance to parameter variations caused by radiation
4Weight of moving object
If high power amplifiers and heavy filter banks are used, then signal processing functionality is achieved, but size and weight increase
Solution Approach 1:
The patent replaces heavy analog filter banks with digital filtering implemented in DSP cores. This substitution dramatically reduces device weight while maintaining or improving signal processing capability, as digital filters can be implemented with minimal hardware compared to analog filter components
Solution Approach 2:
The patent combines filtering, frequency conversion, and signal processing functions into integrated DSP cores. This merging eliminates the need for separate heavy filter banks and amplifiers, reducing device weight while maintaining full signal processing capability through software-defined processing
Data Source
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AI summary
An integrated analog to digital converting and digital to analog converting (ADDA) RF transceiver for satellite applications, configured to replace conventional analog RF down and up conversion circuitry. The ADDA RF transceiver includes one of more ADCs, DSPs, and DACs, all on a single ASIC. Further, the circuity is to be radiation tolerant for high availability and reliability in the ionizing radiation environment present in the space environment.