Voltage Generating Circuit Reducing Complexity for High Speed
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Solution Overview
Problem
Conventional voltage generating circuits for memory devices have high complexity and delayed operation due to complex clock signal generation and feedback paths, which are not suitable for high-speed applications.
Innovation Solution
A voltage generating circuit with reduced complexity, comprising a diode, capacitor, selector, and switches, which generates an output clock signal with an amplitude greater than the power supply voltage, allowing for higher operation frequency and lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional voltage generating circuits use complex clock signal generation and feedback paths, then voltage generation is achieved, but circuit complexity increases and operation speed decreases
Solution Approach 1:
The patent extracts and eliminates the complex feedback paths and multi-phase clock signal generation circuits from the voltage generating circuit. By removing these unnecessary components, the circuit complexity is reduced while maintaining the voltage generation function, thereby enabling higher operation frequencies.
Solution Approach 2:
Instead of using complex feedback paths to control the voltage generation, the patent inverts the approach by using simple switch-controlled direct connection methods. The switches are controlled by simplified clock signals to directly connect or disconnect circuit nodes, achieving voltage generation without complex feedback mechanisms.
2Reliability
If conventional circuits use multiple transistors with feedback paths for voltage doubling, then voltage generation is achieved, but charging time increases due to leak current
Solution Approach 1:
The patent converts the harmful effect of leak current in feedback paths into a beneficial simple switch-controlled architecture. By replacing active transistor feedback paths with passive switch-controlled connections, the leak current problem is eliminated, and charging time is reduced while maintaining reliable voltage generation.
3Ease of operation
If constant high voltage power source is provided, then writing procedure is simplified, but power efficiency deteriorates
Solution Approach 1:
The patent implements a self-service voltage generation system where the memory device generates its own high voltage internally using a voltage generating circuit. This eliminates the need for an external constant high voltage power source, reducing power consumption while maintaining ease of operation for writing procedures.
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
The proposed circuit achieves lower circuit complexity and higher operation frequency, making it suitable for high-speed applications with improved power efficiency.
Implementation Method 1
a capacitor CB connected between a pump signal and a second node
Implementation Method 2
a diode 501 having a first node connected to a voltage source and a second node
Data Source
AI summary
A voltage generating circuit is provided, including a voltage output terminal, a ground terminal, a capacitor, a selector, a first switch, and a second switch. The capacitor is connected between a pump signal and the output of the selector. The selector is controlled by a first control signal and used to select the voltage source or the voltage output terminal to connect the capacitor. The first switch is controlled by a second control signal, and the second switch is controlled by a third control signal. When the first switch is turn-on, the voltage output terminal is connected to the ground terminal. When the second switch is turn-on, the voltage output terminal is connected to the voltage source.