chaotic regimes in oscillating logic gate networks · 2013-08-07 · oscillating logic gate...
TRANSCRIPT
Chaotic Regimes in Oscillating Logic Gate Networks
Sereres Johnston
Experimental Setup
• 74AC04 inverters• Tektronix oscilloscope
– 2.5x10^9 samples / second• Xantrex DC power supply
– 0-5V range used• Agilent signal generator
– Microwave frequencies
• Time delay– Lengths of coaxial cable
• Topologies– 1NOT, 1NOT + time delay, 5NOT
• Reduced Loop Gain– Introduction of feedback resistors
• Chaotic data encoding and transmission.– Data coded in chaotic state,
rather than phase or amplitude
• Detectors in the radio-frequency portion of the electromagnetic spectrum.– Advanced intrusion detection
for buildings
• Models for other complex systems– Gene expression– Neural networks
Necessary components:
- Steep transfer curves
- Time delayed feedback
Above: representative transfer curves for analog inverters
Why Chaos? Why Care?
Network Topology
5NOT
1NOT +time delay +injected signal
Time delay, gain reduction
Microwave signal injection
1NOT
3.7 V power supply
3.8 V power supply
Right: contour plot of slope through zero
Signal injected at:• 443 MHz frequency• 50 mV amplitude
Signal injected at:• 443 MHz frequency• 150 mV amplitude
Signal injected at:• 443 MHz frequency• 250 mV amplitude
Signal injected at:• 443 MHz frequency• 350 mV amplitude
Signal injected at:• 443 MHz frequency• 450 mV amplitude
Signal injected at:• 443 MHz frequency• 550 mV amplitude
Signal injected at:• 443 MHz frequency• 650 mV amplitude
Signal injected at:• 443 MHz frequency• 750 mV amplitude
Signal injected at:• 443 MHz frequency• 850 mV amplitude
Signal injected at:• 443 MHz frequency• 900 mV amplitude
Signal injected at:• 443 MHz frequency• 1V amplitude
Signal injected at:• 443 MHz frequency• 1.3V amplitude
AcknowledgmentsMany thanks to John Rodgers and Daniel P. Lathrop for their support and advice through the duration of the program.
I would also like to thank the University of Maryland and the Institute for Research in Electronics and Applied Physics (IREAP) as well as the TREND program.