[SOLVED] different frequency of operation of Chua's circuit

Status
Not open for further replies.
B

bhuwanmadan72

Junior Member level 2
Joined
Sep 12, 2013
Messages
21
Helped
1
Reputation
2
Reaction score
1
Trophy points
3
Activity points
181
I recently simulated chua's double scroll attractor in PSPICE with L=18mH C1=100nF and C2=10nF
which gave the output as


but FFT showed that the output has a frequency range of 2KHz to 3KHz


I want to use the chaos generated in secure communication so I could modulate my message signal over the chaos generated by tha chua's circuit but the frequency is in the range of audio signal.
so my question is that is there any other values of L,C1 and C2 which could give a different frequency?
 

I didn't forgot, I intentionally didn't uploaded the schematic bcoz I mentioned the name "CHUA'S DOUBLE SCROLL CHAOTIC CIRCUIT"
 

You can use ultrasonic frequencies if you select opamps that work at a frequency that high and reduce the values in the LC tuned circuit.
 

that's what I am asking the circuit is very sensitive to the values of resistor between those capacitors
like in my case there is a range or R from 1.66k to 1.86k till it shows chaotic behavior otherwise not, and the taken conditions are giving me a frequency as mentioned above bot I need a higher ,at least double to what I am getting now, to modulate the audio signal.
 

To get double the frequency, halve the values of the inductor and capacitors.
To get 10 times the frequency, use 1/10 the value for the inductor and capacitors.
etc

- - - Updated - - -

bhuwanmadan72 said:
I want to use the chaos generated in secure communication so I could modulate my message signal over the chaos generated by tha chua's circuit
Click to expand...
How do you propose to demodulate the message at the receiver?
 

ohk ill try this if it works..
at the receiver the same circuit with same values synchronous to the transmitter will be deducted from the received message,and the left over is the message signal with channel noise....

- - - Updated - - -

help me plsss...
 

bhuwanmadan72 said:
at the receiver the same circuit with same values
Click to expand...
They will not give the same output.

In your simulator, try set up two identical circuits, but change the value of one component in one circuit by 1%. See how long they stay synchronised.
 

I have simulated a circuit in PSICE with same values of components and it showed the same synchronized output.

here's the schematic


as you can see the message signal is -0.5V to 0.5V with a time period of 1ms and the marker is the output of the circuit and the output is as shown
 

Attachments

  • schematic.PNG
    33.5 KB · Views: 94

bhuwanmadan72 said:
I have simulated a circuit in PSICE with same values of components and it showed the same synchronized output.
Click to expand...
Maybe you missed this:
godfreyl said:
In your simulator, try set up two identical circuits, but change the value of one component in one circuit by 1%. See how long they stay synchronised.
Click to expand...

- - - Updated - - -

It is not possible to obtain perfectly matched components. There will always be some small difference between the component values in the two circuits.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…