Spike timing dependent plasticity apparatus, system and method
First Claim
1. A spike timing dependent plasticity (STDP) apparatus comprising:
- a first input transconductance amplifier to receive and amplify a first spike signal;
a first leaky integrator connected to an output of the first input transconductance amplifier to receive and integrate the amplified first spike signal, an output of the first leaky integrator being gated to produce a first gated integrated signal;
a second input transconductance amplifier to receive and amplify a second spike signal;
a second leaky integrator connected to an output of the second input transconductance amplifier to receive and integrate the amplified second spike signal, an output of the second leaky integrator being gated to produce a second gated integrated signal; and
an output integrator to integrate a difference of the first gated integrated signal and the second gated integrated signal to produce a weighted signal at an output of the STDP apparatus,wherein the first leaky integrator output is gated according to the second spike signal and the second leaky integrator output is gated according to the first spike signal, and wherein one or more of the first leaky integrator, the second leaky integrator and the output integrator is implemented using a physical circuit.
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Abstract
A spike timing dependent plasticity (STDP) apparatus, neuromorphic synapse system and a method provide STDP processing of spike signals. The STDP apparatus includes a first leaky integrator to receive a first spike signal and a second leaky integrator to receive a second spike signal. An output of the first leaky integrator is gated according to the second spike signal to produce a first gated integrated signal and an output of the second leaky integrator is gated according to the first spike signal to produce a second gated integrated signal. The STDP apparatus further includes an output integrator to integrate a difference of the first and second gated integrated signals to produce a weighted signal. The system includes a synapse core and the STDP apparatus. The method includes integrating the spike signals, gating the integrated signals and integrating a difference of the gated integrated signals.
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Citations
21 Claims
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1. A spike timing dependent plasticity (STDP) apparatus comprising:
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a first input transconductance amplifier to receive and amplify a first spike signal; a first leaky integrator connected to an output of the first input transconductance amplifier to receive and integrate the amplified first spike signal, an output of the first leaky integrator being gated to produce a first gated integrated signal; a second input transconductance amplifier to receive and amplify a second spike signal; a second leaky integrator connected to an output of the second input transconductance amplifier to receive and integrate the amplified second spike signal, an output of the second leaky integrator being gated to produce a second gated integrated signal; and an output integrator to integrate a difference of the first gated integrated signal and the second gated integrated signal to produce a weighted signal at an output of the STDP apparatus, wherein the first leaky integrator output is gated according to the second spike signal and the second leaky integrator output is gated according to the first spike signal, and wherein one or more of the first leaky integrator, the second leaky integrator and the output integrator is implemented using a physical circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A neuromorphic synapse system comprising:
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a synapse core to receive a pre-synaptic spike signal and to produce a weighted spike signal, the weighted spike signal being weighted in accordance with a weight signal, wherein the synapse core comprises a 1-bit digital-to-analog converter (DAC) with adjustable gain; and a spike timing dependent plasticity (STDP) circuit comprising a first gated signal path to amplify the pre-synaptic signal using an input transconductance amplifier and to integrate the amplified pre-synaptic spike signal using a first leaky integrator, a second gated signal path to amplify a post-synaptic spike signal using another input transconductance amplifier and to integrate the amplified post-synaptic spike signal using a second leaky integrator, and an output integrator to integrate a difference between an output signal of the first gated signal path and an output signal of the second gated signal path, the integrated difference being the weight signal, wherein the first gated signal path is gated according to the post-synaptic spike signal, and wherein the second gated signal path is gated according to the pre-synaptic spike signal. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of providing spike timing dependent plasticity (STDP) processing of a first spike signal and a second spike signal, the method comprising:
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amplifying the first spike signal using a transconductance amplifier; integrating the amplified first spike signal using a leaky integrator to produce a first integrated signal; amplifying the second spike signal using another transconductance amplifier; integrating the amplified second spike signal using another leaky integrator to produce a second integrated signal; gating the first integrated signal according to the second spike signal to produce a gated first integrated signal; gating the second integrated signal according to the first spike signal to produce a gated second integrated signal; and integrating a difference of the gated first integrated signal and the gated second integrated signal to produce a weighted signal. - View Dependent Claims (16, 17, 18)
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19. A neuromorphic synapse system comprising:
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a synapse core to receive a pre-synaptic spike signal and to produce a weighted spike signal, the weighted spike signal being weighted in accordance with a weight signal; and a spike timing dependent plasticity (STDP) circuit comprising; a first gated signal path to amplify the pre-synaptic spike signal using an input transconductance amplifier and to integrate the amplified pre-synaptic spike signal using a first leaky integrator; a second gated signal path to amplify a post-synaptic spike signal using another input transconductance amplifier and to integrate the amplified postsynaptic spike signal using a second leaky integrator; and an output integrator to integrate a difference between an output signal of the first gated signal path and an output signal of the second gated signal path, the integrated difference being the weight signal, wherein the first gated signal path is gated according to the post-synaptic spike signal, and wherein the second gated signal path is gated according to the presynaptic spike signal. - View Dependent Claims (20, 21)
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Specification