Charge Pump Voltage Detection Isolation for High-Speed Boost
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Solution Overview
Problem
In NAND flash memory devices, the charge pump circuit's output voltage exhibits a ripple component due to phase compensation capacitors, leading to detection circuit malfunction and delayed boost operations.
Innovation Solution
A voltage generation circuit with a first boost circuit, voltage division circuit, detection circuit, capacitor, and switch configuration that disconnects the capacitor from the detection circuit during the initial boost phase to prevent voltage overshoot and stabilize the charge pump operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a capacitor is connected between the output terminal of the charge pump circuit and the input terminal of the detection circuit to suppress ripple, then the output voltage stability is improved, but the detection circuit malfunctions due to voltage overshoot and the boost operation delays
Solution Approach 1:
The switch is turned on before the detection circuit begins operation to disconnect the capacitor from the detection circuit during the initial boost phase. This preliminary action prevents voltage overshoot from reaching the detection circuit, avoiding malfunction while still allowing the capacitor to suppress ripple in the charge pump output voltage during normal operation
2Stability of the object's composition
If the capacitor is connected to the detection circuit to compensate phase and suppress ripple, then the voltage stability is improved, but the boost operation speed decreases due to repeated malfunction and delay
Solution Approach 1:
The switch is activated in advance to isolate the detection circuit from the capacitor during the critical initial boost phase. This preliminary disconnection prevents the detection circuit from malfunctioning due to voltage overshoot, thereby eliminating repeated delays and enabling high-speed boost operation while the capacitor continues to provide ripple suppression during stable operation
Solution Approach 2:
The capacitor is temporarily extracted from the detection circuit path during the initial boost phase by opening the switch. This extraction removes the harmful voltage overshoot from reaching the detection circuit while the capacitor remains connected to the charge pump output to continue suppressing ripple components in the output voltage
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
This configuration enhances the detection and boost operation speeds, preventing repeated malfunction and ensuring a stable, high-speed boost operation by suppressing ripple components in the output voltage.
Implementation Method 1
a capacitor connected between an output terminal of the charge pump circuit and an input terminal of the detection circuit
Implementation Method 2
An output voltage of the charge pump circuit is detected by a detection circuit
Data Source
AI summary
According to one embodiment, a voltage generation circuit includes a first boost circuit, a voltage division circuit, a first detection circuit, a capacitor and a first switch. The first boost circuit outputs a first voltage. The voltage division circuit divides the first voltage. The first detection circuit is configured to detect a first monitor voltage supplied to the first input terminal, based on a reference voltage which is supplied to a second input terminal of the first detection circuit, and to control an operation of the first boost circuit. The capacitor is connected between an output terminal of the first boost circuit and the first input terminal of the first detection circuit. The first switch cuts off a connection between the capacitor and the first detection circuit, based on an output signal of the first detection circuit, until the first voltage is output from the first boost circuit.