H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 19/08 (2006.01) G06N 3/063 (2006.01) H03M 1/80 (2006.01)
Patent
CA 2166555
The invention relates to a semiconductor device with which input signals can be weighted and the weighted input signals can be summed, and which in conjunction with a neuron can be used, for example, as a synapse in a neural network. The device comprises a number of switched capacitances with a common capacitor plate formed by a surface region (3) in a p-type substrate (1). The region (3) is connected to the inverting input of an amplifier (11) whose + input is connected to a reference voltage and whose output (12) supplies the summed output signal. The output (12) can be fed back to the input (3) via switch S. The other plate of the capacitances is formed by an electrode (6a, 6b, 6c), which can be switched between a reference voltage and an input source. The weight factors are stored in the form of electric charges on a floating gate (5a, 5b, 5c), which is provided between each input electrode (6) and the surface region (3). During operation, the input signals are each converted into a depletion charge in the surface region (3) whose value is dependent not only on the input signal but also on the charge on the associated floating gate. The sum of the depletion charges is subsequently stored in an output capacitance (13, 3) and read out by means of the amplifier (11).
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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