Reconfigurable and reliable logic circuit elements that exploit nonlinearity and noise

• US 7,924,059 B2
• Filed: 02/27/2009
• Issued: 04/12/2011
• Est. Priority Date: 02/27/2009
• Status: Active Grant

• Current Assignee: CDI2, LLC, the united states of america as represented by the secretary of the navy
• Original Assignee: Control Dynamics, Inc., University of Florida Research Foundation, Incorporated (State University System of Florida)
• Inventors: Bulsara, Adi, Sinha, Sudeshna, Ditto, William L., Murali, Krishnamurthy
• Primary Examiner(s): CRAWFORD, JASON
• Application Number:
  US12/394,749
• Publication Number:
  US 20100219862A1
• Time in Patent Office: 774 Days
• Field of Search: 326 37- 41, 326 46- 47, 326/104
• US Class Current: 326/104
• CPC Class Codes: H03K 19/1733 Controllable logic circuits H03K19/177 takes precedence

Abstract

A logic gate is adapted to implement logical expressions. The logic gate includes at least one input that is adapted to receive an input signal and at least one control signal. At least one of the input signal and the control signal is a noise signal. At least one output is adapted to produce an output signal. A nonlinear updater operates as a dynamically configurable element and produces multiple different logic gates as selected by the control signal based at least in part on the noise signal. The nonlinear updater is electrically coupled to the input and is also electrically coupled to the output. The nonlinear updates is configured to apply a nonlinear function to the input signal in response to the control signal to produce the output signal representing a logical expression being implemented by one of the multiple different logic gates on the input signal.

Claims

1. A logic gate adapted to implement logical expressions, the logic gate comprising:

at least one input adapted to receive an input signal and at least one control signal, wherein at least one of the input signal and the control signal is a noise signal;

at least one output adapted to produce an output signal; and

a nonlinear updater that operates as a dynamically configurable element to produce a plurality of different logic gates as selected by the control signal based at least in part on the noise signal, the nonlinear updater electrically coupled to the input and electrically coupled to the output and configured to apply a nonlinear function to the input signal in response to the control signal to produce the output signal representing a logical expression being implemented by one of the plurality of different logic gates on the input signal.

2. The logic gate of claim 1, wherein the input signal is a low amplitude signal formed from a sum of at least two trains of a first aperiodic pulse and a second aperiodic pulse.

3. The logic gate of claim 2, wherein the first aperiodic pulse encodes a first logical input of the input signal and the second aperiodic pulse encodes a second logical input of the input signal.

4. The logic gate of claim 1, wherein the nonlinear updater includes at least one threshold and the output signal representing the logical expression is produced by adjusting the threshold in a given window of noise, wherein the threshold is associated with the nonlinear function applied by the nonlinear updater.

5. The logic gate of claim 1, wherein the nonlinear updater includes an input bias and the output signal representing the logical expression is produced by adjusting the input bias for a given noise intensity.

6. The logic gate of claim 1, wherein the input signal and the control signal are two separate signals.

7. The logic gate of claim 1, wherein the at least one control signal is adjusted such that the dynamically configurable logic gate operates as an AND logic gate.

8. The logic gate of claim 1, wherein the at least one control signal is adjusted such that the dynamically configurable logic gate operates as a NAND logic gate.

9. The logic gate of claim 1, wherein the at least one control signal is adjusted such that the dynamically logic gate operates as an OR logic gate.

10. The logic gate of claim 1, wherein the at least one control signal is adjusted such that the dynamically configurable logic gate operates as a NOR logic gate.

11. A system adapted to implement a logical expression comprising:

an array with at least two or more configurable logic gates,

wherein each of the two or more configurable logic gates comprises;

at least one input adapted to receive an input signal and at least one control signal,

wherein at least one of the input signal and the control signal is a noise signal;

at least one output adapted to produce an output signal; and

a nonlinear updater that operates as a dynamically configurable element to produce a plurality of different logic gates as selected by the control signal based at least in part on the noise signal, the nonlinear updater electrically coupled to the input and electrically coupled to the output and configured to apply a nonlinear function to the input signal in response to the control signal to produce the output signal representing a logical expression being implemented by one of the plurality of different logic gates on the input signal.

12. The system of claim 11, wherein the input signal is a low amplitude signal formed from a sum of at least two trains of a first aperiodic pulse and a second aperiodic pulse.

13. The system of claim 11, wherein the nonlinear updater includes at least one threshold and the output signal representing the logical expression is produced by adjusting the threshold in a given window of noise, wherein the threshold is associated with the nonlinear function applied by the nonlinear updater.

14. The system of claim 11, wherein the nonlinear updater includes an input bias and the output signal representing the logical expression is produced by adjusting the input bias for a given noise intensity.

15. The system of claim 11, wherein the at least one control signal is adjusted such that the dynamically configurable logic gate operates as one of an AND logic gate;

a NAND logic gate;

an OR logic gate; and

a NOR logic gate.

16. A method of changing functionality of a logic gate, the method comprising:

receiving at least one input adapted to receive an input signal and at least one control signal, wherein at least one of the input signal and the control signal is a noise signal;

operating a nonlinear updater as a dynamically configurable element to produce a plurality of different logic gates as selected by the control signal based at least in part on the noise signal, the nonlinear updater being electrically coupled to the input and electrically coupled to an output;

applying, by the nonlinear updater in response to operating the nonlinear updater, a nonlinear function to the input signal in response to the control signal; and

producing, in response to applying the nonlinear function, an output signal representing a logical expression being implemented by one of the plurality of different logic gates on the input signal.

17. The method of claim 16, wherein the input signal is a low amplitude signal formed from a sum of at least two trains of a first aperiodic pulse and a second aperiodic pulse.

18. The method of claim 16, wherein the nonlinear updater includes at least one threshold, and wherein and the producing further comprises:

adjusting the threshold in a given window of noise, wherein the threshold is associated with the nonlinear function applied by the nonlinear updater.

19. The method of claim 16, wherein the nonlinear updater includes an input bias, and wherein the producing further comprises:

adjusting the input bias for a given noise intensity.

20. The method of claim 16, further comprising:

adjusting the at least one control signal such that the dynamically configurable logic gate operates as one of an AND logic gate;

a NAND logic gate;

an OR logic gate; and

a NOR logic gate.