Pumping Voltage Detector for Semiconductor Memory
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Solution Overview
Problem
Conventional semiconductor memory apparatuses experience delays in generating the pumping voltage detection signal when switching from standby or data output mode to data storage mode, which can lead to delayed or inadequate data storage operations.
Innovation Solution
A pumping voltage detector circuit that includes first and second division voltage generating units and a detection signal generating unit, capable of dividing the pumping voltage at different ratios and comparing the divided voltages with a reference voltage to generate a detection signal, ensuring immediate signal enablement when switching to the data storage mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single voltage division ratio is used in the pumping voltage detecting circuit, then the circuit structure is simple, but the detection signal cannot be generated immediately when switching to data storage mode
Solution Approach 1:
The voltage division circuit is segmented into multiple parallel division paths, each with different division ratios. The first voltage division circuit divides the pumping voltage at a first ratio, while the second voltage division circuit divides at a second ratio. This segmentation allows the system to select appropriate division ratios for different operating modes, enabling immediate detection signal generation when switching to data storage mode without requiring a single complex adjustable circuit.
Solution Approach 2:
The voltage division ratio is made dynamic by providing multiple fixed division ratios through parallel circuits. The mode setting unit dynamically selects which division circuit to use based on the operating mode. This dynamic selection mechanism allows the detection circuit to adapt to different modes (standby, data output, data storage) and generate detection signals immediately without delay, resolving the contradiction between speed and complexity.
2Reliability
If the detection signal is delayed for predetermined time after mode switch, then false detection is avoided, but data storage operation is delayed or inadequately performed
Solution Approach 1:
The circuit performs preliminary preparation by having multiple voltage division circuits already configured and ready in parallel. When a mode switch occurs, the appropriate division circuit is immediately activated without waiting for a predetermined time delay. The mode setting unit pre-configures the selection switches to connect the appropriate division circuit, enabling immediate detection signal generation that is synchronized with the mode switch, thus avoiding both false detection and data storage delays.
Solution Approach 2:
The detection circuit changes parameters (voltage division ratio) based on operating mode. Different division ratios are applied for different modes: one ratio for standby/data output modes and another ratio for data storage mode. This parameter change approach allows the circuit to optimize detection timing for each mode, generating detection signals immediately when needed for data storage while maintaining reliability through mode-appropriate parameter selection.
3Measurement precision
If sensitivity adjustment is added to the voltage divider, then detection accuracy improves, but the circuit complexity and component count increase
Solution Approach 1:
Instead of adding complex sensitivity adjustment mechanisms to a single voltage divider, the circuit segments the voltage division function into multiple parallel circuits with fixed but different division ratios. Each circuit provides a specific division ratio optimized for certain modes. This segmentation achieves detection precision for different modes without requiring complex adjustable components, maintaining circuit simplicity while improving measurement precision through dedicated division paths.
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
Enables the detection signal to be generated without time delay when switching to the data storage mode, allowing for immediate and efficient data storage operations in semiconductor memory apparatuses.
Implementation Method 1
a first division voltage generating unit for dividing a pumping voltage at a first division ratio to generate a first divided voltage
Implementation Method 2
a second division voltage generating unit for dividing the pumping voltage at a second division ratio different from the first division ratio to generate a second divided voltage
Implementation Method 3
a detection signal generating unit for comparing one of the first and second divided voltages with a reference voltage to generate a pumping voltage detection signal
Data Source
AI summary
A pumping voltage detector includes a first division voltage generating unit for dividing a pumping voltage at a first division ratio to generate a first divided voltage, a second division voltage generating unit for dividing the pumping voltage at a second division ratio different from the first division ratio to generate a second divided voltage, and a detection signal generating unit for comparing one of the first and second divided voltages with a reference voltage to generate a pumping voltage detection signal.