Voltage Generation Circuit High-Speed Boost Ripple Suppression
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Solution Overview
Problem
In NAND flash memory devices, the charge pump circuit generates high voltages but is hindered by ripple components in the output voltage, leading to delayed boost operations and malfunction due to the coupling of capacitors used for phase compensation in the detection circuit.
Innovation Solution
A voltage generation circuit with a first boost circuit, a voltage division circuit, a detection circuit, a capacitor, and a switch is implemented, where the capacitor is cut off from the detection circuit until the boost operation reaches a predetermined voltage, preventing the detection circuit from malfunctioning and allowing for high-speed boost operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor is used for phase compensation in the detection circuit, then the ripple component is suppressed, but the detection circuit malfunctions due to coupling when the output voltage quickly rises
Solution Approach 1:
The patent extracts the harmful capacitor coupling effect from the detection circuit by introducing a switch that disconnects the capacitor during the initial voltage rise phase. This allows the capacitor to be removed from the circuit when it causes malfunction, while still permitting its use later for ripple suppression.
Solution Approach 2:
The patent applies preliminary action by using the switch to preemptively disconnect the capacitor before the voltage rise causes coupling malfunction. The switch opens during the critical initial phase, preventing the harmful effect before it occurs, then closes later to enable the beneficial ripple suppression function.
2Productivity
If the charge pump circuit operates at high speed, then the boost operation efficiency is improved, but the detection circuit cannot accurately detect the output voltage due to ripple components
Solution Approach 1:
The patent introduces a switch as an intermediary component between the charge pump circuit and the detection circuit. This switch mediates the interaction by selectively connecting or disconnecting the detection circuit from the output voltage, allowing accurate detection during high-speed operation when the switch isolates the ripple, and enabling ripple suppression when the switch connects the capacitor.
3Stability of the object's composition
If the capacitor is connected to suppress ripple components, then the output voltage stability is improved, but the boost operation delays due to detection circuit malfunction
Solution Approach 1:
The patent applies periodic action by controlling the switch to change states at different time periods. During the initial phase, the switch is open to prevent detection circuit malfunction and enable fast startup. After the voltage reaches a threshold, the switch closes to enable the capacitor to suppress ripple and stabilize the output voltage. This time-periodic control resolves the contradiction between fast operation and voltage stability.
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.