Reference Voltage Circuit With Feedback Compensation for Temperature Drift
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Solution Overview
Problem
Semiconductor circuits face challenges in maintaining a stable reference voltage level despite external voltage variations and temperature changes, which affects their operation performance reliability.
Innovation Solution
A reference voltage generation circuit is designed with a feedback loop system that includes a reference circuit, an amplifier circuit, and a current control circuit to generate and maintain a stable reference voltage by compensating for temperature and voltage changes using CTAT and PTAT currents, ensuring consistent voltage levels across nodes and transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reference voltage is generated in a semiconductor circuit, then the circuit can process signals and supply power, but the reference voltage level varies with external voltage changes and temperature changes, reducing operation performance reliability
Solution Approach 1:
The patent employs multiple feedback loops to maintain stable reference voltage. A first feedback loop feeds back a first current to keep voltage levels of first and second nodes equal. A second feedback loop controls the amounts of currents flowing through first and second transistors according to a second current. These feedback mechanisms continuously adjust circuit parameters to compensate for external voltage and temperature variations, ensuring reliable operation performance.
Solution Approach 2:
The patent changes current parameters dynamically to maintain voltage stability. By controlling the amounts of currents flowing through transistors via feedback loops, and by generating currents with different temperature characteristics (CTAT and PTAT currents), the circuit adapts its electrical parameters in response to environmental changes, thereby maintaining stable reference voltage levels.
2Stability of the object's composition
If feedback loops and current control circuits are added to maintain stable reference voltage, then voltage stability improves, but circuit complexity increases
Solution Approach 1:
The patent divides the reference voltage generation circuit into multiple functional segments: reference current paths, feedback loops, amplifier circuits, and current control circuits. Each segment performs a specific function, allowing the complex task of maintaining voltage stability under varying conditions to be broken down into manageable, modular components that can be designed and analyzed independently.
Data Source
AI summary
A reference voltage generation circuit may include: a first reference current path formed through a first node and a first transistor; a second reference current path formed through a second node and a second transistor; a first feedback loop configured to feed a first current back to the first and second reference current paths such that voltage levels of the first and second nodes are kept the same; and a second feedback loop configured to control the currents flowing through the first and second transistors according to a second current.