Multi-VCO PLL Circuitry for Power and Phase Noise Tradeoffs
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Solution Overview
Problem
Conventional integrated circuits face a tradeoff between power consumption and phase noise in voltage-controlled oscillators, leading to wasteful duplication of circuit area when multiple phase-locked loops are used to accommodate different applications with varying requirements.
Innovation Solution
Configurable voltage-controlled oscillator circuits are implemented, where multiple oscillators are connected in parallel and selectively switched using switching circuitry, allowing for optimization based on application-specific requirements, with power-down transistors to conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple phase-locked loops with optimized voltage-controlled oscillators are used to accommodate different applications, then performance requirements for different applications are met, but circuit area increases due to duplication
Solution Approach 1:
The patent combines multiple voltage-controlled oscillators into a single shared resource that can be selectively activated. Instead of having separate PLL circuits for each application, the invention merges the VCO functions while maintaining separate control paths, allowing one VCO to serve multiple applications through selective activation based on performance requirements.
Solution Approach 2:
The patent creates a universal VCO structure that can function for multiple different applications (SONET, Gigabit Ethernet, etc.) by implementing controllable activation mechanisms. The same hardware infrastructure supports different applications with varying performance requirements, eliminating the need for application-specific duplicate circuits.
2Reliability
If a single voltage-controlled oscillator is designed for low phase noise (stringent requirements), then phase noise performance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic activation control where the VCO's operational state can be changed based on real-time requirements. The system can activate or deactivate the VCO depending on whether low phase noise is currently needed, allowing the same hardware to adapt its power consumption level to match the instantaneous performance requirements of different applications.
Solution Approach 2:
The patent changes the operational parameters of the VCO by controlling its activation state. By adjusting whether the VCO is active or inactive based on application requirements, the system dynamically modifies power consumption and phase noise characteristics to match the current operational context.
3Use of energy by moving object
If a voltage-controlled oscillator is designed for low power consumption, then power efficiency is improved, but phase noise performance deteriorates for stringent applications
Solution Approach 1:
The patent implements dynamic state control where the VCO can transition between active and inactive states based on real-time performance requirements. When low phase noise is needed (e.g., SONET applications), the VCO is activated despite higher power consumption. When phase noise requirements are less stringent (e.g., Gigabit Ethernet), the VCO can be deactivated to conserve power.
Solution Approach 2:
The patent dynamically changes the operational parameters of the VCO by controlling its activation state. The system adjusts whether the VCO is powered on or off based on the current application's phase noise requirements, allowing the same hardware to meet both low-power and high-performance needs at different times.
Data Source
AI summary
Configurable phase-locked loop circuitry is provided. The phase-locked loop circuitry may include a buffer having a buffer output and a multiplexer having inputs and an output. The phase-locked loop circuitry may include multiple voltage-controlled oscillators. The phase-locked loop circuitry may be configured to switch a desired one of the voltage-controlled oscillators into use. Each voltage-controlled oscillator may be controlled by control signals applied to a control input for that voltage-controlled oscillator. The control input of each voltage-controlled oscillator may be connected to the buffer output. The output of each voltage-controlled oscillator may be connected to a respective one of the multiplexer inputs. Power-down transistors may be used to disable unused voltage-controlled oscillators to conserve power. The power-down transistors and the multiplexer may be controlled by signals from programmable elements. One or more of the voltage-controlled oscillators may be implemented using a separate integrated circuit connected using through-silicon vias.