Oscillator Regulator Split for Fast Startup and Low Phase Noise
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Solution Overview
Problem
Existing oscillator circuits face challenges in quickly stabilizing the output waveform due to slow transient response times of regulators, leading to potential deterioration in waveform quality immediately after startup.
Innovation Solution
The circuit device incorporates a second regulator with a shorter transient response time than the first regulator, allowing for faster stabilization of the output voltage and reducing phase noise, while the first regulator includes a band-limiting filter to minimize noise and improve waveform quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a regulator with a band-limiting filter is used to reduce noise, then noise reduction is improved, but transient response time increases
Solution Approach 1:
The power supply system is segmented into two separate regulators: a first regulator with a band-limiting filter for noise reduction, and a second regulator without the filter for fast transient response. This segmentation allows each regulator to specialize in one function, resolving the contradiction between noise reduction and fast response.
Solution Approach 2:
Different parts of the circuit receive different types of regulated voltage: the oscillation circuit receives noise-filtered voltage from the first regulator, while the output driver receives fast-response voltage from the second regulator. This local quality differentiation optimizes each subsystem's performance characteristics.
2Reliability
If a regulator with a band-limiting filter is used to stabilize voltage, then waveform quality is improved, but the time to restore voltage after fluctuation increases
Solution Approach 1:
The voltage regulation function is segmented into two parallel paths: one optimized for stability and noise filtering (first regulator), and another optimized for speed and transient response (second regulator). This resolves the contradiction between waveform quality and restoration time.
Solution Approach 2:
The second regulator acts as an intermediary for the output driver, providing fast voltage restoration during transient conditions, while the first regulator serves as the primary stable voltage source for the oscillation circuit. This intermediary relationship allows the system to benefit from both slow stable regulation and fast transient response.
3Object-affected harmful factors
If separate regulators are used for temperature compensation circuit and output circuit, then phase noise is reduced, but device complexity increases
Solution Approach 1:
The power supply is segmented into two regulated voltage lines (first and second regulated voltages) with different characteristics. This segmentation reduces phase noise by preventing noise coupling between the oscillation circuit and output driver, while the complexity is managed through systematic design.
Solution Approach 2:
Both regulators draw from the same unregulated voltage input and serve the overall power supply function, but provide different processed outputs. This multi-functionality approach reduces complexity compared to having completely independent power supply systems while still achieving noise isolation.
Data Source
AI summary
A circuit device includes an oscillation circuit configured to generate an oscillation signal, a first pre-driver disposed in a posterior stage of the oscillation circuit, a first output driver disposed in a posterior stage of the first pre-driver, a first regulator configured to supply a first regulated voltage to the first pre-driver, and a second regulator configured to supply a second regulated voltage to the first output driver, wherein the second regulator is shorter in transient response time than the first regulator.