Voltage Detection Circuit for Charge Pump Stability
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Solution Overview
Problem
Existing charge pump circuits produce inaccurate and unreliable output voltages when powered with inaccurate or varying supply voltages, affecting the program/erase operations in flash memories.
Innovation Solution
A voltage detection circuit comprising a sampling circuit and a latch circuit, connected to a voltage regulation circuit, which samples and detects the supply voltage, allowing for stable output voltage regulation in the charge pump cascade structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the charge pump is powered with a supply voltage that varies in a wide range, then the charge pump can operate under more flexible power conditions, but the output voltage becomes inaccurate and unreliable
Solution Approach 1:
The voltage detection circuit performs preliminary detection of the supply voltage before the charge pump operates. The sampling circuit samples the supply voltage and the latch circuit latches the detection result in advance, allowing the system to know the exact supply voltage level before operation begins. This preliminary action enables subsequent compensation to ensure accurate output voltage regardless of supply variations.
Solution Approach 2:
The voltage detection circuit provides feedback information about the actual supply voltage to the charge pump control system. By continuously monitoring and latching the supply voltage level, the system can adjust its operation to compensate for supply variations, ensuring that the output voltage remains accurate and reliable even when the supply voltage varies in a wide range.
2Measurement precision
If a voltage detection circuit is added to the charge pump, then the output voltage accuracy is improved, but the device complexity increases
Solution Approach 1:
The voltage detection functionality is extracted as a separate, dedicated circuit module with specific components (sampling circuit, latch circuit, comparison circuit). This extraction allows the detection function to be implemented in a focused, efficient manner without complicating the main charge pump operation circuitry. The separated detection circuit can be independently optimized and integrated.
Solution Approach 2:
The voltage detection circuit uses a simplified modeling approach where the supply voltage is sampled and latched to create a representative value for control purposes. Rather than complex real-time analysis, the system creates a copied representation of the voltage state that is sufficient for compensation control, reducing the complexity of the detection mechanism while maintaining accuracy.
Data Source
AI summary
A voltage detection circuit for a charge pump is disclosed. The voltage detection circuit includes a sampling circuit and a latch circuit. The sampling circuit is configured to sample a supply voltage and provide the latch circuit with a sampled voltage. The latch circuit is configured to detect the sampled voltage and latch a result of the detection. And the latch circuit is connected to a voltage regulation circuit which is configured to regulate a charge-pump cascade structure in the charge pump based on the result of the detection so as to maintain an output voltage of the charge pump stable.