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    • 65. 发明申请
    • METHODS AND SYSTEMS OF OPERATING A NEURAL CIRCUIT IN A NON-VOLATILE MEMORY BASED NEURAL-ARRAY
    • US20230113231A1
    • 2023-04-13
    • US17882348
    • 2022-08-05
    • Vishal Sarin
    • Vishal Sarin
    • G06N3/063G06N3/04G06F17/16G06F7/499G06N3/049G06N3/082G06N3/065
    • In one aspect, a method of a neuron circuit includes the step of providing a plurality of 2N−1 single-level-cell (SLC) flash cells for each synapse (Yi) connected to a bit line forming a neuron. The method includes the step of providing an input vector (Xi) for each synapse Yi wherein each input vector is translated into an equivalent electrical signal ESi (current IDACi, pulse TPULSEi, etc). The method includes the step of providing an input current to each synapse sub-circuit varying from 20*ESi to (2N−1)*ESi. The method includes the step of providing a set of weight vectors or synapse (Yi), wherein each weight vector is translated into an equivalent threshold voltage level or resistance level to be stored in one of many non-volatile memory cells assigned to each synapse (Yi). The method includes the step of providing for 2N possible threshold voltage levels or resistance levels in the 2N−1 non-volatile memory cells of each synapse, wherein each cell is configured to store one of the two possible threshold voltage levels. The method includes the step of converting the N digital bits of the weight vector or synapse Yi into equivalent threshold voltage level and store the appropriate cell corresponding to that threshold voltage level in one of the many SLC cells assigned to the weight vector or synapse (Yi). The method includes the step of turning off all remaining 2N−1 flash cells of the respective synapse (Yi).
      Various other methods are presented of forming neuron circuits by providing a plurality of single-level-cell (SLC) and many-level-cell (MLC) non-volatile memory cells, for each synapse (Yi) electrically connected to form a neuron. The disclosure shows methods of forming neurons in various configurations for non-volatile memory cells (flash, RRAM etc.); of different storage capabilities per cell—both SLC and MLC cells.