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 cuts off the capacitor's connection to the detection circuit during the charge pump's initial boost phase, preventing premature voltage rise and stabilizing the operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a phase compensation capacitor is connected to the detection circuit during charge pump operation, then voltage ripple is suppressed, but the detection circuit malfunctions due to premature voltage rise and boost operation delays

Engineering Contradiction:

Improveoutput voltage stabilityVSAvoidboost operation delay

Core Design Contradiction:

Stability of the object's compositionVSLoss of time

Solution Approach 1:

The switch is turned off in advance before the charge pump completes its boost operation, preventing the capacitor from being connected to the detection circuit during the critical initial phase. This preliminary action avoids the harmful effect of premature voltage rise while allowing the capacitor to suppress ripple once the voltage is stable.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The connection between the capacitor and detection circuit is made dynamic through the switch, which transitions from an off state during the initial boost phase to an on state after voltage stabilization. This dynamic configuration allows the system to adaptively manage the capacitor's role in ripple suppression without causing detection circuit malfunction.

Inventive Principle:

Principle #15Dynamics

2Object-generated harmful factors

If the capacitor is connected to the detection circuit during initial boost phase, then voltage ripple suppression is enabled, but detection circuit malfunction occurs due to premature voltage rise

Engineering Contradiction:

Improvevoltage rippleVSAvoiddetection circuit operation

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The harmful influence of the capacitor on the detection circuit is extracted by using the switch to isolate the detection circuit from the capacitor during the initial boost phase. This prevents the capacitor's premature voltage rise from causing detection circuit malfunction while allowing it to suppress ripple in the charge pump output.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The switch acts as an intermediary element between the capacitor and the detection circuit, controlling their interaction. It prevents direct connection during the harmful initial phase while enabling connection during the beneficial ripple suppression phase, thus mediating between the capacitor's dual roles.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If the charge pump operates at high speed, then productivity is improved, but voltage ripple increases causing detection circuit malfunction

Engineering Contradiction:

Improveboost operation speedVSAvoiddetection circuit stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The switch is turned off in advance during high-speed boost operation to prevent the capacitor from causing detection circuit malfunction. This allows the charge pump to operate at high speed without the harmful effects of premature voltage rise, while the capacitor still suppresses ripple in the charge pump output.

Inventive Principle:

Principle #10Preliminary action

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 malfunctions 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 pump circuit and an input terminal of the detection circuit

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

a switch configured to open between the output terminal of the pump circuit and the input terminal of the detection circuit based on an output signal of the detection circuit

Methodology Applied

Scientific EffectElectrical insulation: Electrical Resistance

Data Source

PatentUS12002520B2Voltage generation circuit which is capable of executing high-speed boost operation

Publication Date: 2024.06.04 KIOXIA CORP

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.