Charge Pump Output Voltage Transition Control Circuit
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Solution Overview
Problem
Charge pump circuits face challenges in quickly transitioning from output voltages higher or lower than the input voltage to an equal input voltage, leading to operational issues with constituent components.
Innovation Solution
A voltage providing circuit that includes a charge pump circuit and a voltage adjusting circuit, which controls output voltage levels through a comparison signal and reference voltage selection, allowing for stable generation of output voltages higher or lower than the input voltage, reducing chip size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charge pump circuit is deactivated to output voltage equal to input voltage, then the output voltage returns to input voltage level, but the transition from higher or lower voltage to equal voltage experiences delay
Solution Approach 1:
The voltage adjusting circuit performs preliminary action by pre-adjusting the output voltage to match the input voltage level before the charge pump circuit is fully deactivated. This preliminary voltage adjustment ensures that when the charge pump circuit switches modes, the voltage transition occurs immediately without delay, as the voltage adjusting circuit has already prepared the output voltage to be at the correct level.
2Adaptability or versatility
If the charge pump circuit converts input voltage to higher output voltage, then the output voltage is higher than input voltage, but additional level shifting circuits are required to support voltage transitions
Solution Approach 1:
The voltage adjusting circuit merges the functions of voltage regulation and level shifting into a single integrated circuit. Instead of using separate level shifting circuits in addition to the charge pump circuit, the voltage adjusting circuit combines both functions, thereby reducing overall device complexity while maintaining adaptability to different voltage levels.
Solution Approach 2:
The voltage adjusting circuit is designed with multi-functionality to handle both voltage regulation and level shifting operations. It can adjust the output voltage to match the input voltage level and also support higher or lower voltage outputs from the charge pump circuit, eliminating the need for dedicated level shifting circuits and simplifying the overall system architecture.
3Adaptability or versatility
If the charge pump circuit outputs voltage higher than input voltage, then voltage conversion is achieved, but constituent components may not operate normally during voltage transition
Solution Approach 1:
The voltage adjusting circuit acts as an intermediary between the charge pump circuit and the constituent components. It mediates the voltage transitions by smoothly adjusting the output voltage to match the input voltage level, preventing abrupt voltage changes that could cause constituent components to malfunction. This intermediary function ensures reliable component operation while maintaining voltage conversion capability.
Data Source
AI summary
A voltage providing circuit includes a charge pump circuit configured to perform a charge pumping operation in response to a comparison signal, and to output a charge-pumped output voltage to an output node, and a voltage adjusting circuit configured to control a voltage of the output node by generating a drive voltage based on a reference voltage selection signal and a sink enable signal, and outputting the drive voltage to the output node. In a first time section in which the charge pump circuit is deactivated, the voltage adjusting circuit may output the drive voltage to the output node. In a second time section in which the charge pump circuit is activated, the charge pump circuit performs charging and pumping of the drive voltage and outputs the output voltage at a level of a first output voltage lower than a power supply voltage.