Inducing Chaos in the p/n Junction
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1 Inducing Chaos in the p/n Junction Renato Mariz de Moraes, Marshal Miller, Alex Glasser, Anand Banerjee, Ed Ott, Tom Antonsen, and Steven M. Anlage CSR, Department of Physics MURI Review 14 November, 2003 Funded by STIC/STEP and Air Force MURI
2 Motivation Identify the origins of chaos in the driven resistor inductor - varactor diode series circuit Establish a universal picture of chaos in circuits containing p/n junctions Identify new opportunities to induce chaos exploiting the p/n junction nonlinearity John Rodgers talk
3 Driven Resistor-Inductor-Diode Circuit Studied since the 1980 s Why is the driven RLD circuit so important? Simplest passive circuit that displays period doubling and chaos It is a good model of the ubiquitous p-n junction and its nonlinearities L D V DRIVEN R
4 Chaos in the Driven RLD Circuit 1 R L D Voltage across Resistor R ~ I 2 4 I V 0 sin(ωt) chaos Maximum Voltage across Resistor R 1 4 chaos 2 Driving Amplitude V 0 (V) Bifurcation diagram R = 25 Ω L = 50 µh D = NTE610 f = 2.5 MHz
5 Period-doubling phase diagrams Low Freq. Driving Voltage V 0 (V) Low Freq. Driving Voltage (V) V LF (b) L resonance RLD V LF = V 0 cos(2π f t) Period-1 D R f (MHz) 0 HF signal applied LC j (0) No HF signal Diode = NTE610 L = 390 nh R = 25 Ω f 0 70 MHz f (MHz) f Period-1 1 Period-2 or more complicated behavior RLD + op-amp circuit
6 Nonlinearity of the p-n Junction The diffusive dynamics of majority and minority charge carriers in the p-n junction is complex and nonlinear Charge distribution profiles for a forward-biased diode that is suddenly switched off at t = 0 V D n p0 V D n p (x,t) t = 0 I(V D ) C(V D ) V D or Battery p n (x,t) C t = 0 (forward biased and conducting) t = τ s p n0 x t = τ RR (reverse biased and off) All models of chaotic dynamics in p-n junctions approximate the charge dynamics using nonlinear lumped-elements Real Diode NLCR V D Hunt C(V D ) or I(V D ) C Approximate Nonlinear NLCR Lumped-element Hunt
7 Resistor-Inductor-Diode Circuit What is the cause of chaos? There are 3 competing forms of nonlinearity in this problem: 1. Nonlinear I-V curve I rv (Q). Traditional focus rectification 2. Nonlinear C(V) => V v (Q). C increases by x4 period doubling 1 10 Van Buskirk + Jeffries, Chua, Crevier, etc. -9 f 0 = 2π 1 LC( V ) C(V) (F) Reverse Voltage (-V v ) 3. Finite minority carrier lifetime or reverse recovery time. Delayed feedback The p/n junction retains memory of previous fwd-bias current swings Rollins + Hunt => No consensus on the origin of chaos
8 Reverse Recovery Time τ RR I DIODE (A) A forward-biased diode that is shut off will continue to conduct for the reverse recovery time, τ RR τ RR τ s τ t Diode 1N4007 R = 25 Ω Piecewise linear capacitor τ s = storage time τ t = transition time τ RR = τ s + τ t Drive Voltage (V) V R I DIODE Time (µs)
9 τ rr vs. Diode 1.2µs t (s) D A=5V V DC =0 R=25 Ω Voltage drop at resistor (V) f=100 khz f=700 khz f=700 khz f=700 khz 1N5475B, varactor 120ns NTE610, varactor 60ns 1N4148, fast recovery 0 1N4007, rectifier
10 Search for Period Doubling and Chaos in Driven RLD Circuit Diode τ RR (ns) C j (pf) Results with f 0 ~ 1/τ RR 1N Period-doubling and chaos for f/f 0 ~ N Period-doubling and chaos for f/f 0 ~ N5475B Period-doubling and chaos for f/f 0 ~ NTE Period-doubling and chaos for f/f 0 ~ V LF L RLD V 0 sin(2π ft) D R Results with f 0 ~ 10/τ RR Period-doubling and chaos f/f 0 ~ Period-doubling and chaos for f/f 0 ~ No chaos, nor period-doubling Period-doubling only for f/f 0 ~ f 0 = 2π 1 LC j Results with f 0 ~ 100/τ RR No chaos, nor period-doubling No period doubling or chaos No chaos, nor period-doubling No chaos, nor period-doubling
11 Circuit Chaos: Rule of Thumb Driven Nonlinear Diode Resonator L D V DRIVEN sin(ωt) R For lumped element nonlinear diode resonator circuits, Period Doubling and Chaos are observed for sufficiently large driving amplitudes when; and ω ~ ω 0 /10 4 ω 0 where ω0 = 1 LC j ω 0 < 10/τ RR to 100/τ RR and C j is the diode junction capacitance τ RR is the reverse recovery time of the diode
12 Circuit Chaos Driven Nonlinear Diode Resonator (technical detail) Several kinds of models of the driven RLD circuit show behavior consistent with experiment V D I(V D ) NLCR V D C(V D ) or Battery C Hunt Universal Feature of All Models: All models display a reverse-recovery-like phenomenon, associated with a charge storage mechanism. When ω >> 1/τ RR period doubling and chaos are strongly suppressed
13 Piecewise Linear Capacitor has a Reverse Recovery Time τ RR V I DIODE (A) τ RR Diode 1N4007 R = 25 Ω slope 1/C 2 E 0 slope 1/C 1 Q τ s τ t Piecewise linear capacitor PLC Model for the diode Drive Voltage (V) V R I DIODE Time (µs)
14 Circuit Chaos Driven Nonlinear Diode Resonator The reverse recovery time of the diode is itself a nonlinear function of many parameters, including; History of current transients in the diode Pulse amplitude Pulse frequency Pulse duty cycle DC bias on the junction Influence τ RR These nonlinearities can expand the range of driving parameters over which period doubling and chaos are observed.
15 DC Bias Dependence of Reverse Recovery Time Storage Time (ns) PSpice NTE610 Factor of 10 change in τ s Storage Time (ns) PSpice 1N4007 V DC NTE610 A=5V f=100khz R Forward bias: broader charge distribution in p/n junction, and a longer recovery time DC Offset V DC (V)
16 Max. of Circuit Current (Arb. Units) DC Bias Dependence of Period Doubling +0.2 V (forward bias) 0.0 V -0.4 V (reverse bias) -0.6 V (reverse bias) RLD NTE 610 diode R = 25 Ω, L = 10 µh f =29 MHz >1/τ RR =22 MHz > f 0 = 12.3 MHz Reverse bias enhances period doubling in this case C D (V) (F) Reverse Voltage (-V v But reverse bias should reduce the C(V) nonlinearity! Incident Power (dbm) Drop in τ RR and C D with V DC makes f ~ f 0 ~1/τ RR
17 Circuit Chaos More Complicated Circuits ω LF RLD-TIA Trans-Impedance Amplifier ω HF 2-tone injection experiments: frequency (similar to Vavriv) ω 0 ~ GHz ~ MHz The ω HF signal is rectified, introducing a DC bias on the p/n junction and increasing the circuit nonlinearity at ω LF. Our conclusion: The combination of rectification and nonlinear dynamics in this circuit produces qualitatively new ways to influence circuit behavior by means of rf injection.
18 Two-Tone Injection of Nonlinear Circuits Low Freq. Driving Voltage (V) Driven RLD Circuit Period-1 Region not explored Period-2 Driving Frequency (MHz) (Low Frequency) RF injection causes significant drop in driving amplitude required to produce perioddoubling! Period- Doubling No change in period doubling behavior with or without RF Low Freq. Driving Voltage (V) Driven RLD/TIA Circuit 8 Driving Frequency (MHz) (Low Frequency) Period Doubling (No RF) Period Doubling (With RF)
19 RF Injection Lowers the Threshold for Chaos in Driven RLD/TIA LF = 5.5 MHz + HF = 800 MHz PHF =+40dBm PHF =+30dBm Max. of Op-amp AC Voltage Output PHF =+20dBm Max. of Op-amp AC Voltage Output No Incident Power No DC Offset Period 1 V LF + V HF V DC LF = 5.5 MHz + V DC Offset DC Offset=+440 mv DC Offset=+30 0mv DC Offset=+40 mv Low Frequency Driving Voltage V LF (V) Low Frequency Driving Voltage V LF (V)
20 Two-Tone Injection of Nonlinear Circuits In this case The combination of rectification, nonlinear capacitance, and the DC-bias dependence of τ RR produce complex dynamics In general To understand the p/n junction embedded in more complicated circuits: Nonlinear capacitance Rectification Nonlinearities of τ RR All play a role! More surprises are in store
21 Chaos in the Driven Diode Distributed Circuit R g Transmission Line V g (t) Z 0 delay T V inc V ref A simple model of the ESD circuit on an IC Delay differential equations for the diode voltage + V(t) -
22 Chaos in the Driven Diode Distributed Circuit Simulation results V g =.5 V Period 1 V(t) (Volts) Time (s) V g = 2.25 V Period 2 V(t) (Volts) Time (s) V g = 3.5 V Period 4 V(t) (Volts) Time (s) V g = 5.25 V Chaos V(t) (Volts) Time (s)
23 Chaos in the Driven Diode Distributed Circuit Strobe Points (Volts) Period 1 Period 2 f = 700 MHz T = 87.5 ps R g = 1 Ω Z 0 = 70 Ω PLC, C r = C f /1000 Period 4 V g (Volts) Chaos
24 Challenges for the Future Ten parameters to explore: C f, C r, g, Z o, R g, V g, ω, T, V f, V gap Experimental verification of numerical results 2D projection of chaotic orbit
25 Conclusions about Chaos in the Driven p/n Junction A history-dependent recovery/discharge time scale is the key physics needed to understand chaos in the driven RLD circuit Nonlinear Capacitor (NLC) models have a τ RR -like time scale Both the Hunt and NLC models have a history-dependent recovery time scale due to charge storage mechanisms Real diodes have strong nonlinearities of the reverse recovery time that are not captured in current models The addition of a TIA to the RLD circuit introduces a new way to influence nonlinear circuit behavior through rectification Embedding a diode in a distributed circuit offers new opportunities to induce chaos. See John Rodgers talk
26 Recent Papers on the Nonlinear Diode Resonator and Related Circuits: Renato Mariz de Moraes and Steven M. Anlage, "Unified Model, and Novel Reverse Recovery Nonlinearities, of the Driven Diode Resonator," Phys. Rev. E 68, (2003). Renato Mariz de Moraes and Steven M. Anlage, "Effects of RF Stimulus and Negative Feedback on Nonlinear Circuits," IEEE Trans. Circuits Systems I (in press). T. L. Carroll and L. M. Pecora, Parameter ranges for the onset of period doubling in the diode resonator, Phys. Rev. E 66, (2002) DURIP 2004 proposal: Nonlinear and Chaotic Pulsed Microwave Effects on Electronics Anlage, Granatstein and Rodgers
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