On-Chip Adaptive Voltage Compensation for IC Yield
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Solution Overview
Problem
Integrated circuits are often discarded due to marginal performance variations, leading to yield loss, as traditional testing methods only assess performance at a single operating point, failing to account for changing temperature and voltage conditions, and require extensive calibration, resulting in increased costs and lost opportunities for dynamic power reduction.
Innovation Solution
A system that measures temperature, IR drop, and frequency response on integrated circuits to dynamically adjust the voltage supplied, using on-chip measurement circuits and voltage regulation to optimize performance or reduce power consumption based on real-time operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional single operating point testing is used to grade integrated circuits, then manufacturing cost and test time are reduced, but yield loss increases due to discarding marginally failing circuits that are actually functional
Solution Approach 1:
The patent transitions from static single-point testing to dynamic multi-point testing. The system measures performance at multiple operating points (different temperatures and voltages) to capture the circuit's behavior across its operating range. This dynamic approach identifies marginally failing circuits that remain functional under varying conditions, reducing yield loss while maintaining efficient testing.
Solution Approach 2:
The patent changes testing parameters (temperature and voltage) to evaluate circuit performance under different operating conditions. By varying these parameters and measuring performance at multiple points, the system distinguishes between truly defective circuits and those that merely fail at a single operating point, thereby reducing unnecessary discards and improving yield.
2Reliability
If higher than nominal voltage is specified on packages to guard against performance variations, then reliability is improved, but power consumption increases and dynamic power reduction opportunities are lost
Solution Approach 1:
The patent implements dynamic voltage adjustment based on real-time performance monitoring. Instead of using a fixed higher voltage to ensure reliability, the system continuously measures performance metrics and adjusts voltage dynamically. This maintains reliability by ensuring minimum performance criteria are met while enabling power reduction when full voltage is not needed, thus capturing dynamic power optimization opportunities.
Solution Approach 2:
The patent employs feedback mechanisms where performance measurements from multiple operating points are used to determine appropriate voltage levels. The system monitors circuit performance and adjusts voltage accordingly, creating a closed-loop control system that maintains reliability while optimizing power consumption based on actual performance needs rather than using a conservative fixed voltage.
3Measurement precision
If extensive calibration of individual integrated samples is performed, then measurement precision is improved, but test time and manufacturing cost increase
Solution Approach 1:
The patent applies partial calibration by focusing measurements on critical operating points that most significantly indicate circuit performance and reliability. Rather than exhaustive calibration across all possible conditions, the system identifies and measures at key operating points that provide sufficient precision for grading decisions, thereby reducing test time while maintaining adequate measurement accuracy.
Solution Approach 2:
The patent segments the testing process into discrete measurement steps at different operating points. By dividing the comprehensive performance evaluation into manageable segments (measurements at specific temperature-voltage combinations), the system achieves thorough assessment without requiring continuous exhaustive testing, thus balancing measurement precision with reasonable test time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables dynamic voltage adjustment to enhance performance or reduce power consumption in response to changing conditions, reducing yield loss and test time, while offering flexibility and programmability for varying performance demands.
Implementation Method 1
measuring temperature on the circuit
Implementation Method 2
measuring a voltage drop in the circuit
Implementation Method 3
measuring a frequency response of the circuit
Implementation Method 4
adjusting the voltage supplied to the circuit based on these measurements
Data Source
AI summary
Measurement circuit components are included in an integrated circuit fabricated on a semiconductor substrate. These measurement circuits are connected to a voltage regulation circuit that provides the integrated circuit voltage source. These measurement circuits provide signals to control the voltage regulation circuit to adjust the voltage output to the integrated circuit based upon a measurement values obtained on the semiconductor device. These measurements include temperature and IR drop at locations on the semiconductor substrate, along with the frequency response of integrated circuit.