Voltage Generation Circuit with Precharge for Overshoot Control
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Solution Overview
Problem
Semiconductor circuits face issues with peak current and overshoot due to high reaction speed at the initial operation stage, which can lead to unstable voltage generation.
Innovation Solution
A voltage generation circuit is designed with a driver, amplifier, switch, and control signal generation circuit to precharge a node with a predetermined voltage, reducing the reaction speed during the initial power-up stage and increasing it later, using a comparator, current mirror, and switch to manage internal voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving capability of the voltage generation circuit is increased to achieve fast reaction speed, then the data input/output operation speed is improved, but peak current and overshoot occur at the initial operation stage
Solution Approach 1:
The patent applies preliminary action by precharging the capacitor connected to the gate of the driver transistor before the voltage generation circuit starts operating. This preliminary charging action prepares the gate voltage in advance, allowing the circuit to transition smoothly into operation without generating peak current or overshoot, while still achieving fast reaction speed when needed.
2Stability of the object's composition
If the reaction speed is reduced to eliminate peak current and overshoot, then voltage stability is improved, but data input/output operation speed decreases
Solution Approach 1:
The patent applies dynamics by making the driving capability of the voltage generation circuit adjustable rather than fixed. The circuit can dynamically switch between two operating modes: a first driving capability for fast operation and a second driving capability for stable operation. This dynamic adjustment allows the circuit to optimize performance based on operational requirements, achieving both speed and stability when needed.
Solution Approach 2:
The patent applies parameter changes by modifying the driving capability parameter of the voltage generation circuit based on operational conditions. By changing the driving capability parameter between two levels, the circuit can adapt to different operational requirements, achieving fast data input/output when speed is prioritized and stable voltage generation when stability is prioritized.
3Adaptability or versatility
If the driving capability is adjusted between two levels, then both fast operation and stable operation are achieved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the voltage generation circuit to perform multiple functions through a single adjustable driving capability mechanism. The same circuit structure can operate in both fast mode and stable mode by simply changing the driving capability parameter, eliminating the need for separate circuits for different operational modes and reducing overall device complexity.
Data Source
AI summary
A voltage generation circuit includes a driver configured to generate an internal voltage by driving an external voltage depending on a driving signal; an amplifier configured to generate the driving signal depending on a result of comparing a reference voltage and a feedback voltage; and a switch configured to delay a decrease of the internal voltage by precharging a node of the amplifier with a predetermined voltage depending on a control signal.