Internal Voltage Generation Circuit Noise Reduction
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Solution Overview
Problem
Pumping voltage generation circuits in semiconductor devices experience increased noise levels due to simultaneous operation, which can lead to circuit malfunctions and reduced net die yield, especially in high integration and large capacity semiconductor development.
Innovation Solution
Implementing a reference oscillation signal generator and oscillation signal generators that produce oscillation signals with predetermined phase differences, allowing sequential charge pumping operations to reduce noise in the pumping voltage generation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple pumping voltage generation circuits are provided and simultaneously driven to generate pumping voltage, then the pumping voltage generation capacity is improved, but noise in the pumping voltage increases significantly
Solution Approach 1:
The patent applies periodic action by dividing the charge pumping operations into sequential phases using first and second oscillation signals with different phases. Multiple pumping voltage generation circuits operate at different times rather than simultaneously, with each circuit performing charge pumping operations in response to either the first or second oscillation signal. This temporal distribution of operations maintains high generation capacity while reducing peak noise levels.
Solution Approach 2:
The patent segments the simultaneous operation of multiple pumping voltage generation circuits into separate time phases. The first pumping voltage generation circuit performs charge pumping operations in response to the first oscillation signal, while the second pumping voltage generation circuit performs operations in response to the second oscillation signal. This segmentation of operations in time domain reduces noise interference while maintaining overall productivity.
2Productivity
If multiple pumping voltage generation circuits perform charge pumping operation in response to rising edge, then pumping voltage is generated efficiently, but very large noise is generated in the finally generated pumping voltage
Solution Approach 1:
The patent implements periodic action by using first and second oscillation signals that are phase-shifted versions of each other. The first pumping voltage generation circuit responds to the rising edge of the first oscillation signal, while the second pumping voltage generation circuit responds to the rising edge of the second oscillation signal. This periodic, phase-distributed operation maintains efficiency while distributing noise generation over time, preventing large simultaneous noise spikes.
3Adaptability or versatility
If pumping voltage generation circuits are increased for high integration and large capacity, then device capability is improved, but noise occurring in pumping voltage increases
Solution Approach 1:
The patent segments the operation of increased numbers of pumping voltage generation circuits into distinct time phases using multiple oscillation signals. Each circuit is assigned to operate in response to a specific oscillation signal with a predetermined phase relationship, allowing the device to maintain high integration capability while managing noise through temporal separation of operations.
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 approach minimizes noise in the pumping voltage, stabilizes circuit operations, secures valid data window specifications, and increases net die yield by sharing circuit operations, thereby enhancing manufacturing efficiency and reducing costs.
Implementation Method 1
The pumping voltage generator receives an oscillation signal OSC and performs a charge pumping operation to generate a pumping voltage V_PP
Data Source
AI summary
Internal voltage generation circuit including a reference oscillation signal generator for generating a reference oscillation signal according to a comparison result of a pumping voltage with a reference voltage, an oscillation signal generator for generating a plurality of oscillation signals with a predetermined phase difference and a pumping voltage generator for generating a pumping voltage through sequential charge pumping operations performed in response to the plurality of oscillation signals, respectively.