Dynamic Voltage Scaling Circuit for Integrated Circuits
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Solution Overview
Problem
Integrated circuit designs face challenges in controlling circuit parameters due to process variations, voltage, and temperature fluctuations, leading to unpredictable performance and conservative design margins that result in higher power consumption and slower circuits.
Innovation Solution
The method involves using dynamic voltage scaling (DVS) circuitry to adjust the power supply voltage of each IC die within a range, allowing for relaxed design constraints and offsetting process-induced variations, thereby enabling faster and more power-efficient IC designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative design margins are used to ensure circuit functionality across all process corners, then reliability is improved, but circuit speed and power efficiency deteriorate
Solution Approach 1:
The patent applies dynamic voltage scaling by making the power supply voltage adjustable rather than fixed. The DVS circuitry dynamically modifies the voltage supplied to the IC based on measured performance characteristics, allowing the circuit to operate at optimal speeds while maintaining reliability through feedback control.
Solution Approach 2:
The patent changes the electrical parameter (power supply voltage) to compensate for process variations. By adjusting the voltage within a range, the circuit can achieve desired performance levels without requiring conservative design margins, thereby improving speed and power efficiency while maintaining functionality.
2Reliability
If conservative design margins are used to ensure circuit functionality across all process corners, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamic voltage scaling by making the power supply voltage adjustable rather than fixed. The DVS circuitry dynamically modifies the voltage supplied to the IC based on measured performance characteristics, allowing the circuit to operate at optimal speeds while maintaining reliability through feedback control.
Solution Approach 2:
The patent changes the electrical parameter (power supply voltage) to compensate for process variations. By adjusting the voltage within a range, the circuit can achieve desired performance levels without requiring conservative design margins, thereby improving speed and power efficiency while maintaining functionality.
3Manufacturing precision
If process variations are compensated through conservative design, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service approach where the IC automatically measures its own performance characteristics and adjusts its power supply voltage accordingly. The DVS circuitry includes measurement circuitry that monitors circuit performance and feedback control that autonomously modifies operating parameters, eliminating the need for external calibration or complex design margins.
4Ease of operation
If dynamic voltage scaling is implemented to improve circuit performance, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service approach where the IC automatically measures its own performance characteristics and adjusts its power supply voltage accordingly. The DVS circuitry includes measurement circuitry that monitors circuit performance and feedback control that autonomously modifies operating parameters, eliminating the need for external calibration or complex design margins.
Data Source
AI summary
Methods and systems for integrated circuit design using dynamic voltage scaling may comprise (a) designing an IC to meet a voltage dependent frequency specification, the IC design including feedback circuitry for controlling a power supply voltage to a fabricated instance of the IC design, (b) characterizing a fabrication process for corner lots for the IC design at a range of power supply voltage levels achievable by the feedback circuitry; (c) validating the IC design against the fabrication process if the frequency specification is achievable for essentially all instances of the IC design fabricated, wherein the feedback circuitry in each IC resulting from the IC design is operable to respectively adjust the power supply voltage of each IC resulting from the IC design by reducing the power supply voltage if the IC is from a fast corner lot and increasing power supply voltage if from a slow corner lot.