Shared Oscillator Signal Conditioning for Phase Noise Correlation
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Solution Overview
Problem
In multi-stage signal processing circuits, independent oscillators lead to uncorrelated phase fluctuations, resulting in increased noise due to the lack of correlation among the oscillators and clock generators at each stage, which deteriorates the signal-to-noise ratio.
Innovation Solution
Implementing a single common oscillator across all stages of the circuit, including the digital/analog converter, I/Q modulator, and mixers, to correlate phase fluctuations and reduce overall noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent oscillators are used for each stage, then each stage can operate independently, but the phase fluctuations become uncorrelated and overall noise increases
Solution Approach 1:
The patent merges multiple independent oscillators into a single common oscillator that serves all signal processing stages. This common oscillator generates a master clock signal that is distributed to all stages, ensuring correlated phase fluctuations and reduced overall noise while maintaining independent functional operation of each stage through the use of the shared clock signal.
2Object-affected harmful factors
If a single common oscillator is used across all stages, then phase fluctuations are correlated and overall noise decreases, but the circuit complexity increases
Solution Approach 1:
The common oscillator is designed to serve multiple functions across different signal processing stages simultaneously. A single oscillator circuit generates the master clock signal that is universally distributed to the digital/analog converter, I/Q modulator, and all mixer stages, eliminating the need for multiple separate oscillator circuits while maintaining correlated phase behavior throughout the system.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a signal conditioning circuit with a digital/analog converter (1), an I/Q modulator (2) and at least one mixer (3, 4). According to the invention, instead of a multiplicity of oscillators for the individual stages (21-24), a single oscillator (16) is used. The total noise of the stages (21-24) is decreased by the resulting correlation.