VCO Array Mismatch Control for Ultra-Low Phase Noise
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Solution Overview
Problem
Current single-core LC VCO designs in integrated circuits face limitations in achieving high phase noise performance due to challenges in modeling and predicting inductor characteristics, leading to issues with matching and balancing in large VCO arrays, which results in degraded phase noise and increased costs.
Innovation Solution
The approach involves measuring and adjusting driver strength and resonance frequency mismatches between VCO instances in an array, using interconnect elements with variable resistors and capacitors to minimize mismatch, and employing a master VCO with slave PLLs to reduce phase noise caused by mismatch, thereby optimizing the performance of the VCO array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large VCO array is used to improve phase noise performance, then phase noise is reduced, but mismatch between VCO instances increases leading to degraded performance
Solution Approach 1:
The patent applies parameter changes by adjusting the control voltages of individual VCO instances in the array. Each VCO receives a tailored control voltage that compensates for manufacturing variations, allowing the array to achieve better matching and phase noise performance despite process variations. This is accomplished through a control mechanism that individually tunes each VCO's operating parameters.
Solution Approach 2:
The patent implements feedback by measuring the output signals from each VCO instance and using this information to adjust their control voltages accordingly. The system continuously monitors phase and frequency deviations and applies corrective control signals to minimize mismatch between instances, thereby maintaining optimal phase noise performance across the entire array.
2Manufacturing precision
If individual tuning of each VCO instance is implemented to reduce mismatch, then matching improves, but device complexity increases
Solution Approach 1:
The patent achieves universality by using a single control mechanism that serves multiple functions: it generates control voltages for all VCO instances, measures their outputs, and applies individual adjustments. This multi-functional approach avoids the need for separate tuning circuits for each VCO, thereby reducing overall device complexity while still achieving individual tuning capability.
Solution Approach 2:
The patent merges the control functions for multiple VCO instances into a unified control structure. Instead of having independent control circuits for each VCO, the system combines the control generation, measurement, and adjustment functions into an integrated mechanism that manages all instances efficiently, reducing the total component count and simplifying the overall device architecture.
Data Source
AI summary
Methods and systems are provided for adaptively configuring voltage-controlled oscillator (VCO) arrays, such as to reduce mismatches among the VCOs. A plurality of voltage-controlled oscillators (VCOs), connected in parallel to a common control input, and with each VCO outputting an oscillating signal based on the common control input and an adjustment input, may be configured to reduce mismatches among the VCOs. The plurality of VCO may be configured by adjusting at least one operational parameter applicable to interconnection paths connecting outputs of the plurality of VCOs; measuring a mismatch between signals at the outputs of the plurality of VCOs with respect to a first signal parameter; and adjusting a first operational parameter applicable to one or more of the plurality of VCOs to reduce mismatch between signals at the outputs of the plurality of VCOs with respect to a first signal parameter.