Tunable Reference Circuit for Temperature Curvature Correction
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Solution Overview
Problem
Reference generation circuits suffer from temperature-induced variations that cause curvature in voltage or current reference outputs, leading to unreliable performance across varying temperatures.
Innovation Solution
A reference generation circuit utilizing a pair of tunable transistors in PTAT and CTAT current branches, with selectable diode-connected transistors to adjust gate-source voltage, compensating for temperature-induced variations without additional circuitry, thus reducing non-linearity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If additional circuitry is added to compensate for temperature-induced variations, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent combines temperature compensation functionality with the existing reference generation circuit by integrating tunable transistors into the current branches. Instead of adding separate compensation circuitry, the solution merges the compensation mechanism within the existing PTAT and CTAT current branches, allowing temperature stabilization without proportionally increasing overall circuit complexity
Solution Approach 2:
The patent introduces dynamically tunable transistors whose gate-source voltages can be adjusted to compensate for temperature variations. This dynamic adjustment capability allows the circuit to adapt to changing temperature conditions, maintaining reference stability while using a relatively simple tunable structure rather than complex static compensation networks
2Stability of the object's composition
If complex additional components are used for temperature compensation, then temperature stability is improved, but power consumption increases
Solution Approach 1:
The patent achieves temperature compensation by changing the operating parameters (gate-source voltages) of existing transistors rather than adding new active components. By adjusting these voltage parameters dynamically, the circuit compensates for temperature effects while avoiding the additional power consumption that would result from adding more powered components to the circuit
3Measurement precision
If additional circuitry is added for curvature correction, then reference accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the temperature compensation function into two independent tunable transistors, each controlling a specific current branch (PTAT and CTAT). This segmentation allows for modular adjustment and simplifies the manufacturing process, as each segment can be independently optimized and tuned without requiring complex integrated compensation networks that would increase manufacturing difficulty and cost
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
The solution provides a low-cost, low-area compensation method that maintains a stable reference signal across temperature changes, eliminating the need for complex additional components and reducing power consumption.
Implementation Method 1
selectable to tune a gate-source voltage of each of the first and second banks of diode-connected transistors
Data Source
AI summary
A reference generation circuit includes a proportional-to-absolute temperature (PTAT) current branch having a pair of diodes and a complementary-to-absolute temperature (CTAT) current branch having a pair of resistors. A first bank of diode-connected transistors is positioned in the PTAT branch and a second bank of diode-connected transistors is positioned in the CTAT branch. Diode-connected transistors of the first and second banks of transistors are selectable to tune a gate-source voltage of each of the first and second banks of diode-connected transistors.