Four quadrant synapse cell employing single column summing line
First Claim
1. A neural network including a synapse for providing a weighted connection between an axon and a dendrite coupled to a neuron, said synapse receiving a differential voltage from said axon and supplying/sinking a current to/from said dendrite, said dendrite comprising a single summing line, said synapse comprising a pair of floating gate transistors having floating gate members for storing said weighted connection in the form of a charge.
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Abstract
The present invention covers a synapse cell for providing a weighted connection between a differential input voltage and a single output summing line having an associated capacitance. The connection is made using one or more floating-gate transistors which provide both excitatory as well as inhibitory connections. As configured, each transistor'"'"'s drain is coupled to an input line and its source is coupled to the output summing line. The floating-gate of the transistor is used for storing a charge which corresponds to the strength or weight of the neural connection. When a voltage pulse having a certain duration is applied to the control gate of the floating-gate transistor, a current is generated which acts to discharge the capacitance associated with the output summing line. The current is directly proportional to the charge stored on the floating-gate member and the duration of the input pulse.
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21 Claims
- 1. A neural network including a synapse for providing a weighted connection between an axon and a dendrite coupled to a neuron, said synapse receiving a differential voltage from said axon and supplying/sinking a current to/from said dendrite, said dendrite comprising a single summing line, said synapse comprising a pair of floating gate transistors having floating gate members for storing said weighted connection in the form of a charge.
- 9. A synapse cell for providing a resistive connection between a differentially applied input and a single summing line coupled to a neuron, said cell comprising a pair of floating gate devices having their drains coupled across said differential input, there sources commonly coupled to said summing line, and their floating gates selectively charged such that either a positive or a negative effective resistance is provided by said synapse cell.
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16. An associative network, four-quadrant synapse cell for providing a weighted connection between a pair of input lines and a single output summing line biased to a reference potential, said cell comprising:
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first and second field-effect devices, each having their drains coupled to separate ones of said input lines and their sources commonly coupled to said output line; a first floating gate transistor having a floating gate member coupled to the gate of said first field-effect device; a second floating gate transistor having a floating gate member coupled to the gate of said second field-effect device; said floating gate members of said first and second floating gate transistors each storing electrical charge which regulates the conductivity of said field-effect devices; a means for selectively programming each of said floating gate transistors to establish said weighted connection such that application of a differential input voltage across said pair of input lines either supplies or sinks a current to or from said output summing line. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification