On-Die IC Controller for Process and Environmental Variation Compensation
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Solution Overview
Problem
As integrated circuit technology scales, it faces challenges in dealing with process and environmental variations that affect operating margin, speed, power consumption, and subthreshold leakage in CMOS circuits, with previous methods like body-bias trimming being insufficient.
Innovation Solution
An integrated circuit with a microcontroller formed on a shared die that senses environmental conditions and adjusts operating characteristics of devices and sub-circuits to optimize performance, including the use of environmental sensors to dynamically adjust body-bias and power regulators to meet operational parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If body-bias trimming is used to compensate for process variations, then operating margin is improved, but device complexity and manufacturing precision requirements increase
Solution Approach 1:
The system employs self-service through automatic calibration routines that measure actual device performance parameters and adjust body-bias voltages without external intervention. The microcontroller executes calibration algorithms that autonomously determine optimal bias settings based on measured operating characteristics, eliminating the need for complex manual trimming procedures while achieving improved operating margins.
Solution Approach 2:
The invention applies parameter changes by dynamically adjusting body-bias voltages based on measured performance parameters. The system measures actual device characteristics and modifies bias voltage parameters to compensate for process variations, thereby improving operating margin without increasing physical device complexity. This dynamic parameter adjustment replaces static complex trimming structures with simpler controllable voltage parameters.
2Productivity
If dynamic adjustment of operating characteristics is implemented, then speed and power consumption are improved, but device complexity increases
Solution Approach 1:
The microcontroller serves multiple functions including executing calibration routines, measuring device parameters, adjusting body-bias voltages, and monitoring operating conditions. This multi-functional approach consolidates what would otherwise require separate dedicated circuits for each function, thereby improving speed and power characteristics without proportionally increasing device complexity. The single microcontroller unit performs parameter measurement, analysis, and adjustment operations that enhance productivity.
Solution Approach 2:
The system implements feedback by continuously measuring operating characteristics such as speed and power consumption, comparing these measurements against target parameters, and automatically adjusting body-bias voltages to optimize performance. This closed-loop feedback mechanism enables dynamic improvement of speed and power characteristics without requiring complex open-loop control circuits, as the feedback-driven adaptation occurs through software-controlled voltage adjustment.
3Measurement precision
If environmental sensors are added to sense temperature and voltage changes, then compensation accuracy is improved, but device complexity and area increase
Solution Approach 1:
The invention merges environmental sensing functions with the existing microcontroller system. Temperature and voltage sensors are integrated into the same die as the microcontroller, and their measurement data is processed together with device performance parameters in unified calibration routines. This merging approach allows accurate environmental compensation without requiring separate dedicated control circuits for each sensor, thereby improving measurement precision while minimizing the additional area required.
Solution Approach 2:
The microcontroller acts as an intermediary that receives raw sensor data from temperature and voltage sensors, processes this information along with device performance measurements, and translates it into appropriate body-bias adjustment commands. This intermediary processing consolidates multiple measurement functions into a single coordination point, improving compensation accuracy through integrated analysis while avoiding the area overhead of multiple independent control circuits.
4Manufacturing precision
If calibration routines are executed to adjust body-bias, then manufacturing precision is improved, but productivity during testing increases
Solution Approach 1:
The system performs preliminary calibration actions by executing measurement and adjustment routines during initial device testing or startup. Body-bias voltages are pre-adjusted to optimal values based on measured device characteristics before the device enters normal operation. This preliminary calibration establishes precise operating parameters upfront, improving manufacturing precision without requiring repeated adjustments during production testing, thereby minimizing the time penalty.
Solution Approach 2:
The invention implements periodic calibration routines that can be executed at scheduled intervals or under specific conditions during testing and operation. Rather than requiring continuous adjustment, the system performs measurements and body-bias optimizations periodically, which maintains manufacturing precision while allowing productive testing to proceed uninterrupted between calibration events. This periodic approach balances precision requirements with testing productivity by concentrating adjustment activities at discrete moments.
Data Source
AI summary
An integrated circuit (IC) including a controller integrally formed on a shared die with the IC and method of operating the same to compensate for process and environmental variations in the IC are provided. In one embodiment the IC is comprised of device and sub-circuits, and the method includes: receiving in the IC electrical power and information on at least one of one or more operational parameters of the IC; and adjusting one or more operating characteristics of at least one of the devices and sub-circuits in the IC based on the received information using a controller integrally formed on a shared die with the IC. Other embodiments are also disclosed.