Current controlled sigmoid neural circuit
AssigneeWinbond Electronics Corp.
InventorsBingxue Shi, Lu Chen, Chun Lu
Life of this patent
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Abstract
The current controlled sigmoid neural circuit is used for approximating sigmoid function and is simple constructed, current controlled and gain adjustable circuit with highly precision. The present invention comprises a voltage generator for converting a current input into a voltage, a pair of differential amplifier for generating sigmoid-like function and few pairs of current mirrors for providing reference currents. By using adjustable reference current and gain factor, the circuit has a large range and high noise immunity and can approximate sigmoid function with insignificant error.
Claims10
A current controlled sigmoid neural circuit comprising:
- a first input terminal for receiving a reference voltage;
- a second input terminal for receiving a second reference voltage;
- a second input terminal for ireceiving-athird input current;
- a third input terminal for receiving a third input current;
- an output terminal for outputting a current;
- a voltage generator coupled to the first, second and third input terminals for converting an input current into an output voltage;
- a differential amplifier coupled to the voltage generator for generting a sigmoid-like function;
- a first current mirror for providing a first replicated current simulated by said input reference current for said differential amplifier;
- a second current mirror for providing a second replicated current simulated by said input reference current for a third current mirror, where said third current mirror is for providing an output current to the output terminal.
Dependencies are inferred from the claim text.