Multi-Core VCO Mode Switching Using Supply Reset and Ramp Pulses
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Solution Overview
Problem
Voltage-controlled oscillation circuitry in electronic devices experiences undesired mode dominance, leading to output signals with incorrect frequencies and phase noise, due to higher loop gain in undesired modes compared to desired modes.
Innovation Solution
Implementing switching circuitry to manage supply voltages for voltage-controlled oscillator circuitry, using a reset and ramp pulse or bootstrap pulse to ensure the desired mode gains dominance by adjusting loop gain thresholds and maintaining stable oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage-controlled oscillation circuitry operates in multiple modes with switches to reconfigure frequencies, then frequency range and versatility are improved, but undesired modes may dominate causing incorrect frequencies and phase noise
Solution Approach 1:
The patent applies preliminary anti-action by detecting undesired oscillation modes before they can dominate the desired mode and actively counteracting them. The system monitors for the presence of undesired modes and applies corrective action to prevent these modes from overwhelming the desired oscillation, thereby resolving the contradiction between multi-mode versatility and output signal accuracy.
Solution Approach 2:
The patent implements feedback mechanisms to monitor the oscillation modes and adjust system parameters accordingly. By continuously detecting the presence of undesired modes and using this information to control switching operations, the system maintains frequency accuracy while preserving multi-mode adaptability.
2Adaptability or versatility
If switching circuitry is used to reconfigure oscillator modes, then mode switching capability is improved, but transient supply voltage fluctuations may cause instability
Solution Approach 1:
The patent applies preliminary action by detecting undesired modes in advance and controlling switching operations to prevent mode dominance issues. The system performs detection before switching and uses this information to time the switching operations optimally, preventing transient supply voltage fluctuations from causing instability during mode transitions.
Solution Approach 2:
The patent implements periodic detection and control of oscillation modes to maintain stability during switching. By periodically monitoring the oscillator state and adjusting switching operations accordingly, the system ensures stable transitions between modes while maintaining the ability to switch between multiple configurations.
3Adaptability or versatility
If multiple cores are used in voltage-controlled oscillation circuitry, then frequency coverage is improved, but undesired modes may dominate resulting in phase noise
Solution Approach 1:
The patent applies the extraction principle by detecting and removing the influence of undesired oscillation modes from the multi-core oscillator system. The system identifies undesired modes generated by multiple cores and actively counteracts them, allowing the multi-core architecture to maintain its frequency coverage advantage while eliminating the harmful phase noise effect.
Solution Approach 2:
The patent converts the harmful effect of undesired modes into a beneficial detection signal. By using the presence of undesired modes as information to control switching operations, the system transforms what would be harmful phase noise into a useful indicator for optimizing mode switching, thereby maintaining frequency coverage while eliminating phase noise.
Data Source
AI summary
To prevent an undesired operating mode of voltage-controlled oscillation (VCO) circuitry from dominating a desired operating mode (e.g., an in-phase operating mode or an out-of-phase operating mode), a supply reset and ramp pulse may be provided to the VCO circuitry when switching to a new mode, such that supply voltage to the VCO circuitry is reset (e.g., set to 0 V or another reference voltage), and gradually increased or ramped up back to a steady-state voltage (e.g., used to maintain a mode) within a time duration. Additionally or alternatively, a switch control bootstrap pulse may be provided to the VCO circuitry that is bootstrapped to (e.g., applied instantaneously or concurrently with) switching the VCO circuitry to the new mode. After a time duration, the VCO circuitry may switch back to a steady-state voltage (e.g., used to maintain the new mode).