Chip Select Buffer Control in Power-Down Memory Circuits
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Solution Overview
Problem
Semiconductor memory devices face challenges in reducing power consumption during the power-down mode due to high leakage current, which is not effectively addressed by existing technologies.
Innovation Solution
The semiconductor device incorporates a buffer control circuit that generates a buffer control signal in response to a power-down mode signal and a detection pulse, along with first and second buffer circuits that generate internal chip select signals based on logic levels, and a detection pulse generation circuit to manage the power-down mode and exit from it, optimizing the operation by switching between differential amplification and CMOS circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the device operates in power-down mode to reduce power consumption, then energy usage decreases, but leakage current increases making power reduction ineffective
Solution Approach 1:
The patent extracts and removes the harmful leakage current path by disabling the buffer circuit in power-down mode. The buffer control circuit detects power-down mode and generates a control signal to turn off the buffer, thereby extracting the leakage source from the system and preventing it from compromising power savings.
Solution Approach 2:
The patent implements dynamic operation of the buffer circuit by switching between enabled and disabled states based on operational mode. The buffer control circuit dynamically adjusts the buffer's operation state - enabled during normal operation for signal buffering, and disabled during power-down mode to eliminate leakage, making the system adaptable to different power requirements.
2Object-generated harmful factors
If the buffer circuit is disabled in power-down mode to reduce leakage, then leakage current decreases, but the device cannot properly detect or respond to external signals
Solution Approach 1:
The patent implements a feedback mechanism where the buffer control circuit monitors the operational mode (power-down or normal) and adjusts the buffer state accordingly. The control circuit receives feedback about the current mode and generates appropriate control signals to enable or disable the buffer, ensuring the system responds correctly to external signals only when needed.
Solution Approach 2:
The buffer control circuit automatically manages the buffer's enable/disable state based on the detected operational mode without requiring external intervention. The system self-regulates by detecting its own state and adjusting the buffer accordingly, enabling seamless transition between power-saving and signal-responsive modes.
3Adaptability or versatility
If multiple buffer circuits are used to handle different logic levels, then signal buffering coverage improves, but device complexity increases
Solution Approach 1:
The patent implements a universal buffer control mechanism that manages multiple buffer circuits (first buffer for first logic level, second buffer for second logic level) through a single control circuit. The buffer control circuit serves multiple functions: detecting power-down mode, generating control signals, and managing both buffers' enable/disable states, thereby reducing overall system complexity while maintaining comprehensive signal buffering coverage.
Data Source
AI summary
A semiconductor device includes a buffer control circuit suitable for generating a buffer control signal in response to a power-down mode signal and a detection pulse, a first buffer circuit suitable for generating a first internal chip select signal by buffering a chip select signal depending on a select signal which is generated in response to the buffer control signal in a power-down mode, and a detection pulse generation circuit suitable for generating the detection pulse in response to the first internal chip select signal.