39 results about "Chua's circuit" patented technology

The present invention provides an improved Chua's circuit providing current mode operation, access to all state variables, minimum use of grounded passive elements, and freedom from passive component matching comprising a dual output current conveyer based inductor having one grounded terminal, a capacitor connected across the second terminal of said inductor, a resistor having one terminal connected to the second terminal of said inductor, the second terminal of said resistor connected to one terminal of a second capacitor the other end of which is grounded, and a pair of dual output current conveyers connected together to form a 2-terminal negative resistance having one terminal connected to ground and the second terminal connected to the second terminal of said resistance.

The invention discloses a chaotic encryption method based on three-dimensional probability forming, which comprises the following steps: after carrying out serial-parallel change on to-be-encrypted data, mapping the data to each constellation point of three-dimensional probability forming; and masking the constellation diagram of three-dimensional probability forming by utilizing a chaotic model of the Chua's circuit and a Lorentz chaotic model, wherein the Chua's chaotic model and the Lorentz model are respectively adopted for masking according to different distances from each constellation point to an original point, so that the constellation diagram of three-dimensional probability forming is changed into two spherical shells. According to the invention, after spherical three-dimensional probability forming, the transmitting power of the whole system can be greatly reduced, and a new carrier after probability forming has Gaussian energy distribution and is more suitable for transmission of an optical signal in an optical fiber channel; and the Chua's circuit model and the Lorentz model are used for chaotic mapping, compared with a traditional masking mode, the encryption effectis good, and larger key space and higher flexibility are provided.

The invention discloses a Chua's chaos system synchronization control circuit which is designed based on feedback current, and the adding effect of a synchronous controller is analyzed from the perspective of the circuit. The synchronization control circuit comprises a driving system containing a lead-out variable, a synchronization controller and a response system. By using a feedback control principle, combined with the derivation process of a Chua's circuit dimensionless state equation, a feedback control circuit is designed, and combined with a voltage node part corresponding to a system state variable, the projection synchronization control of the Chua's circuit is realized through changing the feedback current in the circuit. According to the method, the module of the Chua's circuit is not needed, the essential structure of a chaos circuit is reserved, the design mode of the control circuit is novel and effective, the structure, assembly and use are simple, the control cost is low, and the circuit has an extensive application prospect and an application value in the field of chaos control.

The invention relates to a memristor chaotic circuit based on the Chua's circuit, which is characterized in that a first operational amplifier A1, a second operational amplifier A2 and a third operational amplifier A3 constitute a linear phase-reversing integrator, a fourth operational amplifier A4 constitutes a linear phase-reversing amplifier, and the output ends of the first operational amplifier A1, the fourth operational amplifier A4, the third operational amplifier A3 and a sixth operational amplifier A6 are respectively a chaotic signal output end X1, a chaotic signal output end X2, a chaotic signal output end X3 and a chaotic signal output end U; a phase-reversing integrator A1 is connected with a phase-reversing integrator A2, a phase-reversing integrator A6 and a second analog multiplier M2; the phase-reversing integrator A2 is connected with the first operational amplifier A2 and the fourth operational amplifier A4; the phase-reversing integrator A3 is connected with the phase-reversing integrator A2; the A1, A2, A3 and A4 constitute a third-order dynamic integrator circuit; and the A5, A6, M1 and M2 constitute a memristor circuit. Disclosed by the invention is a chaoticcircuit which can output various waveforms, phase diagrams and chaotic evolution curves of a memristor chaotic circuit based on the Chua's circuit and can form a chaotic secure communication system.

The utility model discloses an oscilloscope display circuit for the inductor current in Chua's circuit, which is characterized in that: the voltage relating to the current IL of the inductor L in the Chua's circuit (1) is reflected on the arm of the inductor L and is transferred to a reverse integrator (3) via a voltage follower (2) of the conversion circuit; the output voltage variable is proportional to the inductor current, thus the current-to-voltage conversion is realized and displayed on an oscilloscope (4). The utility model can directly measure and display the current flow of the Chua's circuit by an oscilloscope; the numbers of the three Chua's circuit waveforms which can be measured and displayed by the oscilloscope is enlarged from two to three, and the numbers of the three Chua's circuit phase diagrams also is enlarged to three compared with the original number two; thereby the oscilloscope is suitable for the debugging of the Chua's circuit and is more suitable for the teaching of the college chaos experiment and the demonstration of the science popularization chaos experiment in Chua's circuit.

The invention relates to a memristor chaotic circuit based on the Chua's circuit, which is characterized in that a first operational amplifier A1, a second operational amplifier A2 and a third operational amplifier A3 constitute a linear phase-reversing integrator, a fourth operational amplifier A4 constitutes a linear phase-reversing amplifier, and the output ends of the first operational amplifier A1, the fourth operational amplifier A4, the third operational amplifier A3 and a sixth operational amplifier A6 are respectively a chaotic signal output end X1, a chaotic signal output end X2, a chaotic signal output end X3 and a chaotic signal output end U; a phase-reversing integrator A1 is connected with a phase-reversing integrator A2, a phase-reversing integrator A6 and a second analog multiplier M2; the phase-reversing integrator A2 is connected with the first operational amplifier A2 and the fourth operational amplifier A4; the phase-reversing integrator A3 is connected with the phase-reversing integrator A2; the A1, A2, A3 and A4 constitute a third-order dynamic integrator circuit; and the A5, A6, M1 and M2 constitute a memristor circuit. Disclosed by the invention is a chaoticcircuit which can output various waveforms, phase diagrams and chaotic evolution curves of a memristor chaotic circuit based on the Chua's circuit and can form a chaotic secure communication system.

The invention discloses a CMOS (Complementary Metal-Oxide-Semiconductor) inverter pair based method and a circuit for designing a high-speed chaotic oscillator. In the invention, a negative resistance circuit consisting of a CMOS inverter pair is used for replacing a negative resistance circuit based on an operational amplifier in a Chua's circuit to generate chaotic oscillation; a CMOS inverter circuit consists of a chip CD4069 or consists of two PMOS (P-channel Metal Oxide Semiconductor) tubes and two NMOS (N-channel metal oxide semiconductor) tubes, inherits the characteristics of the traditional Chua's circuit and is used for generating chaotic oscillation signals; and when a CMOS inverter pair is used, i.e. two reversely connected inverters are used as a negative resistance circuit of an oscillator, the defect of lower working frequency of the traditional Chua's circuit can be overcome, and the inverter pair can work with a higher frequency, so that high-speed chaotic oscillation can be generated, and the working frequency reaches MHz. The circuit can be designed and realized by using discrete devices, and the chip of the high-speed chaotic oscillator can be designed and realized by using a standard CMOS process, thus the circuit is beneficial to the manufacture and the production of chaotic signal sources in a large scale with low cost.

The invention discloses a high-security transmission method based on double encryption of three-dimensional constellations, which comprises the following steps: performing serial-to-parallel conversion on the binary data at the transmitting end; performing constellation mapping on the three-dimensional data to form constellation points; using Cai's chaotic model The chaotic sequence generates the displacement vector and rotation vector of the constellation point, and performs displacement transformation and rotation transformation on the three-dimensional constellation point; uses three-dimensional carrier-free amplitude phase modulation to process the encrypted three-dimensional signal, and superimposes the processed three-dimensional signal into a single-channel signal. Enter the channel transmission; demodulate the received signal at the receiving end, and finally obtain the original data. The invention utilizes the Chua's circuit model to generate a chaotic sequence to change the position of the constellation point by displacement and rotation, realizes two encryptions of the constellation diagram, and effectively improves the security performance of the system; utilizes the high gain index and high anti-noise performance of the constellation to effectively improve the system transmission capacity.