Multi-Core VCO Mode Switching Using Supply Reset and Ramp Pulses
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Solution Overview
Problem
Voltage-controlled oscillation circuitry in wireless communication devices experiences undesired mode dominance, leading to output signals with incorrect frequencies and phase noise, due to higher loop gain of 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 has a larger loop gain than undesired modes, thereby stabilizing the desired oscillation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage-controlled oscillation circuitry operates in multiple modes with different 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 action by providing a reset and ramp pulse or bootstrap pulse to the voltage-controlled oscillator circuitry before switching to a desired operating mode. This preliminary voltage application ensures that the desired mode has sufficient loop gain to dominate over undesired modes from the start of the switching transition, preventing incorrect frequencies and phase noise in the output signal.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the supply voltage to the voltage-controlled oscillator circuitry during mode transitions. By changing the voltage parameter through switching circuitry and pulse generation, the loop gain of the desired mode is enhanced relative to undesired modes, ensuring reliable operation across multiple frequency ranges.
2Reliability
If switching circuitry is added to manage supply voltages for mode switching, then mode transition reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the voltage control function into separate switching circuitry components that independently manage supply voltages to different parts of the oscillator circuitry. This segmentation allows for precise control of mode transitions while keeping each switching component relatively simple, balancing reliability improvement with manageable complexity.
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).