Hybrid DAC Signal Generation for Low-Noise Frequency Sourcing
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Solution Overview
Problem
Existing material measurement systems face challenges in generating robust, high-quality source signals with low noise, particularly when dealing with sensitive measurements under compromising conditions, such as extreme temperatures and high field strengths. Current systems lack flexibility in addressing noise, glitches, and other ambiguities introduced via source signals, and often fail to treat DC and AC components differently and independently.
Innovation Solution
The proposed solution involves a hybrid analog signal generating source that utilizes two or more digital-to-analog converters (DACs) to generate both low and high frequency components. This system includes a data processor for input signal processing, a combining circuit to combine the outputs of the DACs, and a feedback portion with a servo loop to maintain the source signal's integrity and agreement with the input signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-path DAC systems are used, then device complexity is reduced, but noise and signal quality deteriorate under sensitive measurement conditions
Solution Approach 1:
The patent divides the signal generation system into multiple independent paths (first path for low frequency signals, second path for high frequency signals), each with its own DAC. This segmentation allows each path to be optimized for its specific frequency range, improving overall signal quality while managing complexity through functional division.
Solution Approach 2:
The patent adds a frequency dimension to the signal generation architecture by creating separate paths for different frequency ranges. This dimensional approach allows independent optimization of low frequency and high frequency signal generation, resolving the contradiction between signal quality and system complexity.
2Adaptability or versatility
If uniform source processing is applied to DC and AC components, then device complexity is reduced, but adaptability and measurement precision deteriorate
Solution Approach 1:
The patent applies different processing characteristics to different parts of the signal spectrum. The first path processes low frequency signals with characteristics optimized for that range, while the second path processes high frequency signals with appropriate optimizations. This local quality approach enables adaptable signal processing without requiring a completely complex reconfigurable architecture.
Solution Approach 2:
By segmenting the processing architecture into frequency-specific paths, the system gains adaptability for different signal types while maintaining manageable complexity through modular design. Each segment can be independently optimized without affecting the other segments.
3Object-affected harmful factors
If single DAC systems are used, then device complexity is reduced, but noise and glitches increase in sensitive measurements
Solution Approach 1:
The patent segments the conversion function across multiple DACs operating in parallel on different frequency paths. This segmentation distributes the noise and glitch generation potential across independent converters, and through proper synchronization and combining, achieves lower overall noise and glitching than a single DAC system.
Solution Approach 2:
The patent converts the potential harm of multiple independent DACs (which could introduce more noise and glitches) into a benefit by using them in a coordinated multi-path architecture. The independent paths can be optimized to minimize their respective noise floors, and the combining process integrates these low-noise signals to achieve superior overall performance.
4Measurement precision
If high field strength and extreme temperatures are applied for material measurements, then measurement capability is improved, but noise and interference increase
Solution Approach 1:
The patent implements feedback mechanisms that can actively compensate for noise and interference introduced by high field strength and extreme temperature conditions. The feedback portion monitors the output signals and adjusts the input signals accordingly, maintaining measurement precision despite the harsh measurement environment.
Data Source
AI summary
An analog signal generating source comprising two or more digital-to-analog converters (DAC) combined to generate one or more frequency components. The analog signal source comprises a first path for generating substantially low frequency signals, the first path comprising a first one of the DACs; and a second path for generating substantially high frequency signals, the second path comprising a second one of the DACs. The analog signal source also comprises a data processor for processing an input signal and providing the processed input signal to the first and second paths; a combining circuit configured to combine outputs of the first and second paths into the source signal; a feedback portion configured to sense the source signal; and a servo loop configured to use the sensed source signal to adjust as need to maintain the source signal to substantially agree with the input signal.