Reference Voltage Generator Circuit with Segmented Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional reference voltage generating circuits in semiconductor memory devices cannot independently control the temperature characteristic and absolute value of the generated voltage, making it difficult to achieve a desired voltage with a specific temperature gradient.
Innovation Solution
A reference voltage generator circuit comprising a first and second current path with diodes and resistors, along with a comparator and a transistor, allows for independent adjustment of the temperature characteristic and absolute value of the output voltage by using diodes and resistors in series, and an operational amplifier for comparative amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional reference voltage generating circuit is used to obtain a positive temperature characteristic, then the temperature gradient is achieved, but the absolute value of the generated voltage becomes larger than 1.2V
Solution Approach 1:
The patent divides the voltage adjustment function into two independent parts: a first voltage generating circuit that provides the temperature characteristic, and a second voltage generating circuit that adjusts the absolute value. This segmentation allows independent control of temperature gradient and voltage magnitude, resolving the contradiction where conventional circuits couple these parameters.
Solution Approach 2:
The patent introduces a splitting resistor as an intermediary element that selectively reduces only the absolute value of the reference voltage without affecting the temperature characteristic gradient. This intermediary component decouples the relationship between voltage magnitude and temperature dependence, enabling independent optimization of both parameters.
2Manufacturing precision
If a splitting resistor is used to lower the absolute value of the generated voltage, then the voltage magnitude is reduced, but the gradient of the temperature characteristic is also lowered
Solution Approach 1:
The patent segments the voltage generation into two independent circuits: the first circuit generates voltage with the desired temperature characteristic, and the second circuit (with the splitting resistor) independently adjusts the absolute value. This segmentation prevents the temperature gradient from being reduced when lowering the voltage magnitude.
Solution Approach 2:
The patent applies partial action by having the splitting resistor perform only the function of adjusting absolute voltage magnitude, while leaving the temperature characteristic function to the first voltage generating circuit. This partial division of functions allows one component to reduce voltage without excessively affecting the temperature gradient.
3Device complexity
If a conventional reference voltage generating circuit is used, then the circuit structure is simple, but it is impossible to control independently the temperature characteristic and absolute value of the generated voltage
Solution Approach 1:
The patent segments the reference voltage generating circuit into functionally independent modules: a first voltage generating circuit for temperature characteristic control and a second voltage generating circuit for absolute value adjustment. This modular segmentation increases adaptability while maintaining reasonable structural simplicity through clear functional separation.
Solution Approach 2:
The patent creates a universal reference voltage generating circuit that can independently provide both temperature characteristic control and absolute value adjustment. This multi-functional design allows the circuit to adapt to various requirements (different voltage magnitudes and temperature gradients) without requiring complete circuit redesign, enhancing versatility.
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
Enables the generation of a reference voltage with a smaller absolute value and a large positive temperature characteristic, allowing for precise control of the temperature gradient and absolute value, improving the flexibility and efficiency of voltage generation in semiconductor memory devices.
Implementation Method 1
a first current path formed between an input terminal supplied with a first reference voltage and an output terminal and including a first diode and a first resistor serially connected from the input terminal
Implementation Method 2
a first comparator supplied with a voltage on a first node between the first diode and the first resistor and a voltage on a second node between the second resistor and the third resistor for comparative amplification
Implementation Method 3
a transistor connected between the output terminal and a second reference voltage and having a control terminal to receive an output from the first comparator
Data Source
AI summary
A reference voltage generator circuit comprises a first current path and a second current path. The first current path is formed between an input terminal supplied with a first reference voltage and an output terminal and including a first diode and a first resistor serially connected from the input terminal. The second current path is formed between the input terminal and the output terminal and including a second diode, a second resistor and a third resistor serially connected from the input terminal. A comparator is supplied with a voltage on a node between the first diode and the first resistor and a voltage on a node between the second resistor and the third resistor for comparative amplification. A transistor is connected between the output terminal and a second reference voltage and having a control terminal to receive an output from the first comparator.