Broadband chaotic circuit based on HBT process

Abstract

The invention discloses a broadband chaotic circuit based on an HBT process. The circuit comprises transistors, a frequency selection network, a bias module and an output module. The transistors comprise a first transistor Q1, a second transistor Q2 and a third transistor Q3; collectors of the first transistor Q1, the second transistor Q2 and the third transistor Q3 are connected with the bias module in series. The output node of the output module is located on the collector of the third transistor Q3, the frequency selection network is connected with the base and the emitter of the first transistor Q1, the emitters of the first transistor Q1 and the second transistor Q2 are connected with the collector of the third transistor Q3, and the transistors are heterojunction bipolar transistorsbased on the HBT technology. The circuit is stable in chaotic state and less affected by parasitic parameters, the circuit can still generate stable and continuous chaotic signals under the load of 1000 ohms, the chaotic signals are flat, the fundamental frequency is 3.79 GHz, the frequency spectrum covers 3-12 GHz, and the circuit is suitable for broadband radio frequency wireless communication.And the circuit is suitable for being applied to small, integrated and low-power-consumption scenes.

Description

technical field [0001] The invention relates to a broadband chaotic circuit, more specifically, to a broadband chaotic circuit based on HBT technology. Background technique [0002] Chaotic signals have the characteristics of internal randomness, nonlinearity, and noise-like characteristics, and the spectrum has broadband characteristics. It is one of the effective ways to solve secure communication and ultra-wideband communication, and has broad application prospects. Chaotic signals are generally generated by oscillating circuits. Early chaotic oscillating circuits include Wien bridge oscillators and Chua's circuits. Circuits of this type typically use operational amplifiers and nonlinear diodes as basic components. However, limited by the operating speed of the operational amplifier and diode, the fundamental frequency of the chaotic signal generated by the circuit is generally low, at the KHz and MHz level, and the bandwidth is very narrow, so it cannot meet the high fu...

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Problems solved by technology

However, due to the influence of the parasitic parameters of the nonlinear element itself, it is difficult to obtain a chaotic signal with a higher fundamental frequency; the cut-off frequency and parasitic parameters of the nonlinear element itself make it difficult to obtain a continuous broadband chaotic signal; the Colpitts chaotic oscillation of the classical structure The circuit is constrained by its structure, and a small parameter adjustment will change the state of the circuit, and it is easy to jump out of the chaotic oscillation state, which also limits its application in the field of integrated circuits

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