Semiconductor Circuit Temperature Compensation
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Solution Overview
Problem
Recent semiconductor devices face challenges with voltage and current signals that have temperature varying characteristics, as resistors within these devices exhibit temperature-dependent behavior, leading to inconsistent performance across varying temperatures.
Innovation Solution
A semiconductor circuit design incorporating a four-input differential amplifier with diodes and an NMOS or PMOS transistor, where the ratio of PN junction areas and current ratios between diodes and transistors are adjusted to produce output voltages or currents that are proportional to temperature, allowing for temperature compensation by connecting post-stage circuits with specific temperature characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage signal is applied to a resistor in a semiconductor device, then current flows through the resistor, but the current varies with temperature changes due to the resistor's temperature varying characteristic
Solution Approach 1:
The patent employs feedback mechanisms where the output signal is fed back to adjust the input signal. The differential amplifier compares the input signal with a feedback signal that accounts for temperature variations, enabling the circuit to compensate for temperature-dependent resistor behavior and maintain stable current output across varying temperatures.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the operating points of transistors and bias conditions to counteract temperature effects. By dynamically changing electrical parameters such as gate voltages and current ratios in response to temperature variations, the circuit maintains consistent current flow despite resistor temperature dependence.
2Adaptability or versatility
If various circuits with temperature varying characteristics are connected to receive voltage or current signals, then the circuits can operate, but their performance becomes inconsistent across temperature variations
Solution Approach 1:
The patent designs a universal signal generation circuit that can interface with multiple different post-stage circuits having various temperature characteristics. The differential amplifier configuration with adjustable inputs allows the same circuit to adapt to different load requirements while providing temperature-compensated output signals, ensuring consistent performance across diverse circuit applications.
Solution Approach 2:
The patent implements dynamic adjustment capabilities where the circuit automatically adapts its output characteristics based on the connected post-stage circuit's requirements. Through dynamic biasing and feedback mechanisms, the circuit maintains optimal performance across temperature variations regardless of which specific post-stage circuit is connected, ensuring both compatibility and reliability.
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
This design enables the semiconductor circuit to output voltages or currents with desired temperature characteristics, effectively offsetting temperature dependencies in post-stage circuits, ensuring consistent performance across temperature variations.
Implementation Method 1
A first diode has a first junction area and a first anode connected to one of the first positive input terminal or the first negative input terminal. A first cathode of the first diode is connected to a ground potential. A second diode has a second junction area and a second anode connected to the other one of the first negative input terminal and the first positive input terminal to which the first diode is not connected. A second cathode of the second diode is connected to a ground potential.
Data Source
AI summary
A semiconductor circuit includes a differential amplifier having a first positive terminal, a second positive terminal, a first negative terminal, a second negative terminal, and an output terminal. The output voltage is at a level that corresponds to a voltage level obtained by subtracting a voltage of the first negative terminal and the second negative terminal from a voltage sum of the first positive terminal and the second positive terminal. A first diode has a first anode connected to one of the first positive or the first negative terminal. A second diode has a second anode connected to the other of the first negative and first positive terminal. A predetermined reference voltage is applied to the second positive terminal. And a voltage corresponding to the output voltage of the differential amplifier is fed back to the second negative terminal.