Single PVT Reference Source for Multi-Domain IC Compensation
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Solution Overview
Problem
Integrated circuits face performance variations due to process corner variations, local supply voltage, and temperature changes, leading to potential malfunctioning or reduced speed, especially in high-speed circuitry, and require separate reference circuits for different voltage domains.
Innovation Solution
A single reference source generates a signal independent of process, voltage, and temperature (PVT) conditions, allowing a single control circuit to compensate for variations across multiple voltage domains, and is integrated with ESD protection circuits for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate reference circuits are provided for each voltage domain, then each voltage domain can be compensated for PVT variations, but the device complexity and number of reference sources increase
Solution Approach 1:
The reference source is designed to provide reference signals for multiple voltage domains simultaneously. The single reference source generates reference signals that are suitable for circuit components operating in different voltage domains (e.g., 3.3V, 2.5V, 1.8V, 1.2V), eliminating the need for separate reference sources for each voltage domain while maintaining PVT compensation accuracy across all domains.
2Reliability
If the IC is designed to operate at lower speed, then timing variations due to PVT conditions are accounted for, but the productivity and performance of high-speed circuitry are reduced
Solution Approach 1:
The control circuit dynamically adjusts the timing of circuit components based on detected PVT conditions. Instead of designing for the worst-case scenario at a fixed lower speed, the system continuously monitors PVT parameters and adaptively modifies timing characteristics to maintain optimal performance across varying conditions, enabling high-speed operation while accounting for process, voltage, and temperature variations.
Solution Approach 2:
The system implements feedback mechanisms where PVT conditions are continuously detected and used to adjust circuit timing in real-time. The control circuit receives information about actual PVT conditions and modifies the timing of circuit components accordingly, creating a closed-loop system that maintains timing accuracy without requiring conservative fixed-speed design.
3Reliability
If multiple reference sources are used for different voltage domains, then each domain gets optimized reference signal, but the manufacturing cost and device area increase
Solution Approach 1:
The reference source is designed to provide reference signals for multiple voltage domains simultaneously. The single reference source generates reference signals that are suitable for circuit components operating in different voltage domains (e.g., 3.3V, 2.5V, 1.8V, 1.2V), eliminating the need for separate reference sources for each voltage domain while maintaining PVT compensation accuracy across all domains.
Data Source
AI summary
The electronic circuit comprises a functional module (10), a condition signaling module (20), a reference module (30) and a control circuit (40). The condition signaling module (20) generates an indication signal (Imeas) indicative for PVT conditions local to the functional module. The PVT conditions comprise a set of conditions relevant for a module comprising at least one of a voltage supplied to said module, a temperature within an area occupied by said module and the process conditions relevant for said area The reference module (30) generates a reference signal (Iref) having a value that is substantially independent of said PVT-conditions. The control circuit (40) compares the indication signal (Imeas) and the reference signal (Iref), and for generating a control signal (pvt<1>, . . . , pvt<n>) for the functional module.