Internal Voltage Generation Circuit for DRAM Stability
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Solution Overview
Problem
The increasing integration of DRAM and higher external power supply voltages degrade transistor reliability, making it challenging to design a circuit that stably operates with varying external power supply voltages and reduces power consumption.
Innovation Solution
An internal voltage generation device that includes a voltage generation block for comparing a reference voltage and a divided voltage, a pull-up driving unit for selectively driving the internal voltage, and a test control unit to manage the operation of digital and analog driving units, allowing for stable internal voltage generation by selectively using analog and digital circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage conversion circuit is used to decrease power supply voltage, then power consumption is reduced and operation stability is improved, but device complexity increases
Solution Approach 1:
The voltage generation circuit is divided into multiple independent blocks: a voltage generation block that generates the internal voltage, a digital driving block that controls the voltage generation block, and a test control block that manages testing. This segmentation allows each block to be optimized independently, improving overall reliability while maintaining manageable complexity through modular design.
Solution Approach 2:
A digital driving block is introduced as an intermediary between the test control block and the voltage generation block. This intermediary translates test control signals into appropriate control actions for the voltage generation block, enabling precise control of internal voltage generation while keeping the overall system architecture clear and maintainable.
2Power
If higher external power supply voltage is used, then transistor performance is improved, but transistor reliability is degraded
Solution Approach 1:
The system changes the voltage parameter from high external power supply voltage to a lower, stabilized internal voltage generated by the voltage generation block. This parameter transformation allows the circuit to operate with improved transistor reliability while still achieving the necessary power performance through efficient voltage utilization and power management.
3Reliability
If analog driving unit is used for stable voltage generation, then operation stability is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between analog and digital driving modes based on operational requirements. The test control block enables the circuit to use the analog driving unit for stable voltage generation when needed, while allowing the digital driving block to handle routine operations with lower power consumption, achieving an optimal balance between stability and energy efficiency.
Data Source
AI summary
An internal voltage generation device includes a voltage generation block configured to compare a reference voltage and a divided voltage, and generate an output voltage; and an internal voltage driving block including a pull-up driving unit which selectively pull-up drives an internal voltage according to the output voltage, and configured to output the output voltage to the pull-up driving unit through different paths according to a test signal.