Negative Voltage Generating Circuit With Automatic Adjustment
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Solution Overview
Problem
Traditional negative voltage generating circuits in integrated circuits face issues with generating stable output voltage, as they are susceptible to changes in load current and can only produce a single level of negative voltage, making them unsuitable for deep submicron processes with low power supply voltages.
Innovation Solution
A negative voltage generating circuit with an automatic voltage adjustment function, incorporating a feedback control module and specific transistor and capacitor configurations, which adjusts the charge current based on load current to maintain voltage stability and allow for digital adjustment of output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional negative voltage generating circuits are used, then the circuit structure is simple, but the output voltage is unstable and susceptible to load current changes
Solution Approach 1:
The patent introduces a feedback control module that detects the output voltage and adjusts the charge pump operation accordingly. The feedback mechanism compares the actual output voltage with the reference voltage and dynamically controls the switching of PMOS transistors to maintain stable output, directly resolving the voltage stability issue while adding controlled complexity.
Solution Approach 2:
The circuit transitions from a static negative voltage generator to a dynamic system with automatic voltage adjustment. The feedback control module continuously monitors and adjusts operating parameters (switching timing, charge pump activation) based on load conditions, enabling the circuit to adapt dynamically and maintain stability under varying loads.
2Adaptability or versatility
If traditional negative voltage generating circuits are used, then the circuit design is simple, but only single level negative voltage can be generated
Solution Approach 1:
The patent implements a dynamically adjustable voltage generation system where the feedback control module can modify the charge pump operation to produce different voltage levels. By controlling the switching sequence and timing of PMOS transistors based on feedback, the circuit can generate multiple negative voltage levels rather than a fixed single level.
Solution Approach 2:
The circuit enables voltage level adjustment by changing operational parameters such as the switching duty cycle, charge pump activation timing, and transistor gate control signals. These parameter modifications allow the same hardware to produce different output voltage levels adaptively.
3Reliability
If charge current is increased to compensate for load current changes, then the output voltage stability improves, but the power consumption increases
Solution Approach 1:
The feedback control module monitors output voltage and dynamically adjusts charge current based on actual load conditions rather than using a fixed high current. This closed-loop control ensures sufficient current is provided only when needed to maintain stability, reducing unnecessary power consumption during light load conditions.
Solution Approach 2:
The system transitions from static high current operation to dynamic current adjustment. The charge pump and switching transistors are controlled adaptively based on feedback, allowing the circuit to use minimal sufficient current for each operating condition, optimizing the trade-off between stability and power consumption.
Data Source
AI summary
The present disclosure provides a negative voltage generating circuit having an automatic voltage adjustment function, including a negative voltage generating circuit and a feedback control module. The negative voltage generated by the negative voltage generating circuit is adjusted by the feedback control module. The negative voltage generating circuit having the automatic voltage adjustment function of the present disclosure can automatically adjust the charge current of the charge pump according to the load current, thereby realizing the stability of the output voltage, such that the traditional analog circuit structure can work normally under the extremely low power supply voltage, and is particularly suitable for the deep submicron process. The present disclosure also realizes the digital adjustment of the output voltage, the negative voltage output is no longer single, and can be adjusted according to actual needs.