Temperature-Compensated Voltage Reference Circuit for Stable IC Biasing
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Solution Overview
Problem
The miniaturization of integrated circuits has led to stringent design and manufacturing requirements, as well as reliability challenges, particularly in generating stable reference voltages with minimal temperature dependence.
Innovation Solution
A voltage reference circuit utilizing stacked gate devices with temperature-sensitive devices that generate bias currents proportional (PTAT) and inversely proportional (CTAT) to temperature, compensated by a trimming circuit to achieve a reference voltage with minimal temperature coefficient, using cascode structures and current mirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If integrated circuits are miniaturized to increase functionality and operating speed, then device density and speed are improved, but temperature stability and reliability of reference voltage generation deteriorate
Solution Approach 1:
The reference voltage generation circuit is segmented into multiple independent temperature compensation branches, each handling different temperature ranges or compensation mechanisms. This allows each segment to be optimized for specific temperature stability requirements while maintaining overall circuit functionality at miniaturized scales
Solution Approach 2:
The invention changes the electrical parameters of the reference voltage generation circuit by introducing temperature-dependent bias currents and adjustable gain stages. This allows the circuit to dynamically compensate for temperature variations, maintaining reference voltage stability despite miniaturization-induced thermal effects
2Volume of moving object
If integrated circuits are miniaturized, then device size is reduced, but manufacturing precision and design complexity increase
Solution Approach 1:
The temperature compensation circuit is designed with universal building blocks that can be replicated and scaled. Standardized current mirrors, bias generation stages, and compensation networks are used throughout the circuit, allowing the same design patterns to be applied at different scales and reducing manufacturing precision requirements
Solution Approach 2:
The circuit employs nested structures where smaller functional blocks are embedded within larger ones. For example, current mirrors are nested within bias generation circuits, which are nested within the overall reference voltage generation architecture. This nested organization allows efficient space utilization and simplifies manufacturing at miniaturized scales
3Reliability
If temperature compensation is added to stabilize reference voltage, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The temperature compensation functionality is merged with the reference voltage generation circuit rather than being implemented as a separate system. Compensation currents are generated using the same transistor stacks and bias networks that produce the reference voltage, eliminating the need for additional independent compensation circuits and reducing overall device complexity
Solution Approach 2:
The circuit uses itself to generate temperature compensation signals. The same transistor stacks and current mirrors that generate the reference voltage also produce temperature-dependent currents that are fed back to compensate for thermal drift. This self-service approach eliminates the need for external temperature sensors or separate compensation circuits
Data Source
AI summary
An integrated circuit is provided, which includes a first temperature-sensitive device and a second temperature-sensitive device. The first temperature-sensitive device is configured to generate a first bias current which monotonically increases in accordance with an absolute temperature, and generate a first voltage based on the first bias current. The second temperature-sensitive device is configured to generate a second voltage across the second temperature-sensitive device, and output a reference voltage at an output terminal of the integrated circuit. The second voltage monotonically decreases in accordance with the absolute temperature. The reference voltage equals the first voltage plus the second voltage.