Digital Circuit PVT Compensation via Replica Loop
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Solution Overview
Problem
Existing digital circuits face challenges in compensating for Process-Voltage-Temperature (PVT) variations, particularly at low voltages, which affects their operating speed and power dissipation, and existing solutions fail to equally balance rise and fall times of logic gates, leading to inefficiencies in sub- or near-threshold regions.
Innovation Solution
An electronic device with a compensation device that includes a critical path replica module, speed measurement module, and control module to adjust voltage and control the operating speed of digital circuits, while also using a current balance detector module to equalize rise and fall times of logic gates, thereby optimizing power dissipation and performance across PVT variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voltage is reduced to save dynamic power, then power dissipation is reduced, but PVT variations sensitivity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reference voltage level based on detected PVT conditions. The compensation device monitors process, voltage, and temperature variations and adapts the reference voltage accordingly, allowing the system to operate reliably at lower voltages while compensating for increased sensitivity to PVT variations.
Solution Approach 2:
The patent implements feedback through a compensation device that continuously monitors PVT variations and adjusts the reference voltage in response. This closed-loop feedback mechanism detects changes in process, voltage, and temperature conditions and dynamically compensates for their effects, enabling low-voltage operation while maintaining stability against PVT variations.
2Loss of energy
If transistors are operated in sub-threshold or near-threshold region to reduce power, then power consumption is reduced, but speed performance degrades
Solution Approach 1:
The patent uses parameter changes by adjusting the reference voltage level dynamically based on operating conditions. This allows the system to optimize the trade-off between power consumption and speed performance by adapting the voltage reference to match the desired operating point, enabling efficient sub-threshold or near-threshold operation while maintaining acceptable speed.
Solution Approach 2:
The patent applies dynamics by implementing a dynamic reference voltage adjustment mechanism that adapts to changing operating conditions in real-time. The compensation device continuously modifies the reference voltage based on detected PVT variations and performance requirements, allowing the system to dynamically balance power consumption and speed performance rather than operating at a fixed point.
3Speed
If compensation device adjusts voltage to control operating speed, then speed control is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a compensation device that performs multiple functions: it monitors PVT variations, adjusts the reference voltage for speed control, and compensates for process and temperature effects. This multi-functional approach consolidates several functions into a single integrated device, improving speed control while minimizing the increase in overall device complexity.
Solution Approach 2:
The patent merges multiple functions into a single compensation device that combines PVT monitoring, reference voltage adjustment, and speed control capabilities. By integrating these functions rather than implementing them as separate components, the patent achieves effective speed control while limiting the increase in device complexity through functional consolidation.
Data Source
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AI summary
The present invention concerns an electronic device (1000) comprising a digital circuit (6) to be compensated and a compensation device for compensating PVT variations of this digital circuit (6). This compensation device is arranged also for controlling the operating speed (fDIG) of the 5 digital circuit (6) and can also be arranged for equalising a rise time and a fall time of a logic gate comprising the transistors of the digital circuit (6).The electronic device (1000) implements a first loop, allowing to control the operating speed (fDIG) of the digital circuit (6) by exploiting the same voltage at the compensation terminals of the compensation device and at 10 the terminals at the digital circuit (6) and at a critical path replica module (4) allowing to control the threshold voltages of the respective transistors. The electronic device (1000) can implement also a second loop allowing to equalise the rise and fall times of a logic gate comprising the transistors of the digital circuit (6).