Product-Sum Calculation Device Charge Discharge Control
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Solution Overview
Problem
Existing product-sum calculation devices lack efficient control mechanisms, leading to suboptimal operation and instability in output potential changes.
Innovation Solution
A product-sum calculation device and method that utilize a plurality of synapses with variable resistance transistors, along with input and output lines, and a charge and discharge control unit to manage the output state based on transistor polarity, enabling efficient and stable output by controlling charge and discharge states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a product-sum calculation device uses a crossbar structure with floating gate transistors as synapses, then the device can perform neural network calculations, but the operation efficiency and output stability are insufficient due to lack of specific control mechanisms
Solution Approach 1:
The patent applies preliminary action by pre-charging or pre-discharging output lines before product-sum calculation based on the polarity of transistors. This preparatory control of the output state ensures that the calculation starts from a known initial condition, improving both operation efficiency and output stability. The control unit determines the charge/discharge state in advance according to transistor polarity (n-type or p-type), which optimizes the calculation process.
2Productivity
If the output state is not controlled based on transistor polarity, then the device structure remains simple, but the potential change output from synapse to output line is inefficient and unstable
Solution Approach 1:
The patent applies local quality by implementing different charge/discharge control strategies for different transistor polarities. The control unit adapts the output line state (charge or discharge) according to the specific polarity (n-type or p-type) of each transistor. This localized adaptation optimizes potential change efficiency for each synapse while maintaining overall system simplicity, as the control logic directly follows the physical characteristics of the transistors.
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 allows for more efficient and stable operation of the product-sum calculation device by optimizing the output from synapses to output lines, enhancing the device's performance.
Implementation Method 1
a charge and discharge control unit configured to control an output state of the product-sum calculation result by controlling a charge and discharge state of the output line on the basis of a polarity of the transistor
Data Source
AI summary
To provide a product-sum calculation device that includes a plurality of synapses including a transistor and having a variable resistance value, a plurality of input lines extending in a first direction and that propagates an input signal to each of the plurality of synapses, a plurality of output lines extending in a second direction orthogonal to the first direction, and that outputs a product-sum calculation result of the input signal from each of the plurality of synapses, and a charge and discharge control unit that controls an output state of the product-sum calculation result by controlling a charge and discharge state of the output line on the basis of a polarity of the transistor.