CN109921807A - A kind of broadband chaotic oscillating circuit - Google Patents
A kind of broadband chaotic oscillating circuit Download PDFInfo
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- CN109921807A CN109921807A CN201810284356.0A CN201810284356A CN109921807A CN 109921807 A CN109921807 A CN 109921807A CN 201810284356 A CN201810284356 A CN 201810284356A CN 109921807 A CN109921807 A CN 109921807A
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Abstract
A kind of broadband chaotic oscillating circuit, including radio frequency triode, frequency-selective network module, biasing module and output module；Frequency-selective network module is connected with the base stage of radio frequency triode constitutes Colpitts oscillator, and biasing module connects the base stage and emitter of radio frequency triode, and the current collection of radio frequency triode extremely signal output node is connected with output module.The circuit is based on Colpitts oscillating circuit, is biased using double electric resistance partial pressures, powers to the base stage of radio frequency triode.The generation of chaotic signal is realized positioned at the resonant network of base stage and emitter cooperation radio frequency triode.Signal output node is located at collector, the concatenated inductance of load resistance and collector of output module forms RLC series resonant network, this resonant network does not influence circuit state, and can improve signal spectrum by adjusting resonance frequency, and then realize the output of broadband signal.The circuit has stronger load capacity, can produce continuous Chaotic Wideband Signal, and signal spectrum is relatively flat, is suitable for wide band radio-frequency wireless telecommunications.
Description
Technical field
The invention belongs to RF wireless communication technical fields, and in particular to a kind of broadband chaotic oscillating circuit.
Background technique
Chaotic signal has intrinsic stochasticity, non-linear, noise like characteristic, and frequency spectrum has broadband characteristics, is to solve
One of secure communication, effective way of broadband connections, are with a wide range of applications.
Chaotic signal is generally generated by oscillating circuit, and previous chaotic oscillating circuit has wien-bridge oscillator, cai's circuit.
The circuit of this type can generally use operational amplifier as basic element, however be limited by the operating rate of operational amplifier,
The fundamental frequency of chaotic signal caused by circuit is generally lower, is KHz and MHz rank.Therefore it is not able to satisfy higher fundamental frequency requirement
Scene application.
Colpitts oscillating circuit structure is simple, and frequency-selective network is made of passive device, and what non-linear element was chosen is to cut
The only higher triode of frequency or field-effect tube, therefore the chaotic signal of higher fundamental frequency can be provided.But it is limited by non-linear member
The parasitic parameter of part itself influences, it is difficult to obtain the chaotic signal of higher fundamental frequency.Equally it is limited by cutting for nonlinear device itself
Only frequency and parasitic parameter obtain continuous Chaotic Wideband Signal and also become difficult.
Summary of the invention
It is an object of the invention to: a kind of broadband chaotic oscillating circuit is provided, provides fundamental frequency by frequency-selective network module.It is mentioning
While negative resistance is risen convenient for circuit starting of oscillation, chaotic signal frequency spectrum is compensated by high-frequency resonant, improves bandwidth.
In order to reach the goals above, a kind of broadband chaotic oscillating circuit, including radio frequency triode, frequency-selective network mould are provided
Block, biasing module and output module；Frequency-selective network module is connected with the base stage of radio frequency triode constitutes Colpitts oscillator,
Biasing module connects the base stage and emitter of radio frequency triode, the current collection of radio frequency triode extremely signal output node, with output
Module is connected.
Preferred embodiment of the invention is: frequency-selective network module include first resistor R1, the first inductance Lb, first capacitor C1,
Second capacitor C2 and the first coupled capacitor Cb；The base stage of one end connection radio frequency triode of first coupled capacitor Cb, the other end
It is divided into two-way, is grounded after connecting the first inductance Lb and first resistor R1 being connected in series all the way；Another way connects first capacitor C1's
One end, the other end of first capacitor C1 are separately connected the emitter of radio frequency triode and one end of the second capacitor C2, the second capacitor
The other end of C2 is grounded.
Preferably, biasing module includes second resistance Rb1,3rd resistor Rb2, the second inductance Lc, the 4th resistance Re and
Three inductance Le；The base stage of one end connection radio frequency triode of second resistance Rb1, the other end are connected with power end VDD, power end
VDD passes through the collector of the second inductance Lc connection radio frequency triode；
The base stage of one end connection radio frequency triode of 3rd resistor Rb2, other end ground connection；
One end of third inductance Le is connected with the emitter of radio frequency triode, and the 4th resistance Re of other end series connection is followed by
Ground.
Preferably, output module includes the second coupled capacitor Cc and load resistance RD, the second coupled capacitor Cc and load electricity
Hinder RD series connection, the collector of one end connection radio frequency triode of the second coupled capacitor Cc.
Preferably, radio frequency triode is BFG520 bipolar junction transistor.
The invention has the following beneficial effects: this circuit is based on Colpitts oscillating circuit, biased using double electric resistance partial pressures, to radio frequency
The base stage of triode is powered.The generation of chaotic signal is realized positioned at the resonant network of base stage and emitter cooperation radio frequency triode.
Signal output node is located at collector, and the concatenated inductance of load resistance and collector of output module forms RLC series resonance net
Network, this resonant network does not influence circuit state, and can improve signal spectrum by adjusting resonance frequency, and then realize broadband
The output of signal.The circuit has stronger load capacity, can produce continuous Chaotic Wideband Signal, and signal spectrum is more
It is flat, it is suitable for wide band radio-frequency wireless telecommunications.
Detailed description of the invention
The present invention will be further described below with reference to the drawings.
Fig. 1 is electrical block diagram of the invention；
Fig. 2 is that the circuit of the invention frequency spectrum of output signal when the second inductance Lc is 3nH and 0.5nH compares figure；
Specific embodiment
Embodiment one
Referring to Fig. 1, the present embodiment provides a kind of broadband chaotic oscillating circuit, including radio frequency triode, frequency-selective network mould
Block, biasing module and output module；Frequency-selective network module is connected with the base stage of radio frequency triode constitutes colpitts oscillator,
Biasing module connects the base stage and emitter of radio frequency triode, the current collection of radio frequency triode extremely signal output node, with output
Module is connected.
Frequency-selective network module includes first resistor R1, the first inductance Lb, first capacitor C1, the second capacitor C2 and the first coupling
Close capacitor Cb；The base stage of one end connection radio frequency triode of first coupled capacitor Cb, the other end are divided into two-way, connect phase all the way
It is grounded after concatenated first inductance Lb and first resistor R1；Another way connects one end of first capacitor C1, and first capacitor C1's is another
One end is separately connected the emitter of radio frequency triode and one end of the second capacitor C2, the other end ground connection of the second capacitor C2.
Biasing module includes second resistance Rb1,3rd resistor Rb2, the second inductance Lc, the 4th resistance Re and third inductance
Le；The base stage of one end connection radio frequency triode of second resistance Rb1, the other end are connected with power end VDD, and power end VDD is logical
Cross the collector of the second inductance Lc connection radio frequency triode；
The base stage of one end connection radio frequency triode of 3rd resistor Rb2, other end ground connection；
One end of third inductance Le is connected with the emitter of radio frequency triode, and the 4th resistance Re of other end series connection is followed by
Ground.
Output module includes that the second coupled capacitor Cc and load resistance RD, the second coupled capacitor Cc and load resistance RD go here and there
Connection, the collector of one end connection radio frequency triode of the second coupled capacitor Cc.
Radio frequency triode is BFG520 bipolar junction transistor.
In circuit, frequency-selective network module is based on Colpitts oscillating circuit, is connected with triode and generates oscillator signal.Frequency-selecting
Network module determines circuit state, and the circuit state equation thus derived is nonlinear differential equation, in frequency-selective network parameter
When meeting certain condition, there are infinite solutions, i.e. circuit to be in chaos state for this equation.The fundamental frequency formula of oscillation is as follows:
Fundamental frequency is vibrated to improve, should suitably reduce the inductance capacitance value of frequency-selective network, but so will lead to the Q value drop of circuit
It is low, and then circuit is caused to be difficult to starting of oscillation.To make circuit be easier to starting of oscillation, in transistor collector regulation of series inductance Lc.This is added
After inductance, the negative resistance of circuit is on the one hand improved, makes up the starting of oscillation difficult problem that fundamental frequency higher band is come.On the other hand can cooperate
Output module plays the role of adjusting bandwidth.
Output node is located at transistor collector, and the second inductance Lc, the second coupled capacitor Cc and load resistance RD are formed
RLC series resonance.Since the effect of the second inductance Lc is to promote circuit negative resistance, it is not involved in the operation of circuit state equation, because
The size of this second inductance Lc is not influence circuit to enter chaos state in the case where guaranteeing circuit oscillation.It to sum up, can be with
The appropriate value for adjusting the second inductance Lc, generates resonance under certain frequency, the power spectrum density under this frequency is higher, can use
In the spectrum density for compensating the chaotic signal under this frequency.Therefore, it if the frequency spectrum of chaotic signal is lower under certain frequency, is adjusted
The value for stating the second inductance Lc in resonant network, makes resonance frequency be in the spectrum density lower of chaotic signal, thus plays
Power compensation effect, to promote continuous bandwidth.
It is worth noting that, the second inductance Lc not consumption signal energy, therefore in the case where supply voltage is constant, it is adjusting
The general power of entire output signal will not be changed during saving the second inductance Lc.As shown in Fig. 2, being compared to the second inductance Lc
Output spectrum when 3nH, since resonance frequency is higher when the second inductance Lc is 0.5nH, the energy compensating of resonance 10GHz or so
High frequency section signal power, the power spectral density of corresponding low frequency part can decline, and total output signal power is kept not
Become.Doing so can make the frequency spectrum of output signal become flat, actually improve the bandwidth of signal.
This circuit promotes circuit negative resistance by the concatenated second inductance Lc of collector, enables circuit in the higher situation of fundamental frequency
It is easier to starting of oscillation, into chaos state.Output node positioned at collector can pass through and adjust the second inductance Lc's there are resonant network
Value makees corresponding power compensation, and then adjustment signal flatness to the frequency spectrum of output signal, improves continuous bandwidth, realizes broadband
The output of chaotic signal.
Circuit of the present invention possesses stronger load capacity, keeps remaining parameter constant, is supported within the scope of 50-200 Ω and becomes
When change, circuit can be in chaos state.
It is chaotic signal that simulation result, which can see output signal, and the signal bandwidth in 30dBm is about 10GHz (1.5-
11.5GHz)。
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (5)
1. kind of broadband chaotic oscillating circuit, which is characterized in that including radio frequency triode, frequency-selective network module, biasing module and defeated
Module out；The frequency-selective network module is connected with the base stage of the radio frequency triode constitutes Colpitts oscillator, the biasing
Module connects the base stage and emitter of the radio frequency triode, the current collection extremely signal output node of the radio frequency triode, with
The output module is connected.
2. a kind of broadband chaotic oscillating circuit according to claim 1, which is characterized in that the frequency-selective network module includes
First resistor R1, the first inductance Lb, first capacitor C1, the second capacitor C2 and the first coupled capacitor Cb；First coupled capacitor
One end of Cb connects the base stage of the radio frequency triode, and the other end is divided into two-way, connects first electricity being connected in series all the way
It is grounded after the sense Lb and first resistor R1；Another way connects one end of the first capacitor C1, and the first capacitor C1's is another
One end is separately connected the emitter of the radio frequency triode and one end of the second capacitor C2, another termination of the second capacitor C2
Ground.
3. a kind of broadband chaotic oscillating circuit according to claim 1, which is characterized in that the biasing module includes second
Resistance Rb1,3rd resistor Rb2, the second inductance Lc, the 4th resistance Re and third inductance Le；One end of the second resistance Rb1 connects
The base stage of the radio frequency triode is connect, the other end is connected with power end VDD, and the power end VDD is connected by the second inductance Lc
Connect the collector of the radio frequency triode；
One end of the 3rd resistor Rb2 connects the base stage of the radio frequency triode, other end ground connection；
One end of the third inductance Le is connected with the emitter of the radio frequency triode, other end series connection the 4th resistance
It is grounded after Re.
4. a kind of broadband chaotic oscillating circuit according to claim 1, which is characterized in that the output module includes second
Coupled capacitor Cc and load resistance RD, the second coupled capacitor Cc and the load resistance RD series connection, the second coupling electricity
The one end for holding Cc connects the collector of the radio frequency triode.
5. a kind of broadband chaotic oscillating circuit according to claim 1, which is characterized in that the radio frequency triode is
BFG520 bipolar junction transistor.
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| CN201810284356.0A CN109921807A (en) | 2018-04-02 | 2018-04-02 | A kind of broadband chaotic oscillating circuit |
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| CN201810284356.0A CN109921807A (en) | 2018-04-02 | 2018-04-02 | A kind of broadband chaotic oscillating circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019196A (en) * | 2020-07-31 | 2020-12-01 | 南京邮电大学 | Broadband chaotic circuit based on HBT (heterojunction bipolar transistor) process |
| CN116032328A (en) * | 2022-12-19 | 2023-04-28 | 陕西亿星远能科技有限公司 | Battery-less wireless communication system and method |
| CN118713599A (en) * | 2024-08-28 | 2024-09-27 | 成都世源频控技术股份有限公司 | Low phase noise coaxial medium oscillating circuit |
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| CN105467272A (en) * | 2015-11-24 | 2016-04-06 | 郑州职业技术学院 | Cable-fault on-line detection device based on wide-band chaotic signal and detection method thereof |
| CN106330427A (en) * | 2016-08-16 | 2017-01-11 | 中国电子科技集团公司第三十八研究所 | Darlington structure microwave chaotic circuit, chip, circuit module and design method of Darlington structure microwave chaotic circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019196A (en) * | 2020-07-31 | 2020-12-01 | 南京邮电大学 | Broadband chaotic circuit based on HBT (heterojunction bipolar transistor) process |
| CN112019196B (en) * | 2020-07-31 | 2022-11-08 | 南京邮电大学 | Broadband chaotic circuit based on HBT (heterojunction bipolar transistor) process |
| CN116032328A (en) * | 2022-12-19 | 2023-04-28 | 陕西亿星远能科技有限公司 | Battery-less wireless communication system and method |
| CN116032328B (en) * | 2022-12-19 | 2024-06-18 | 陕西亿星远能科技有限公司 | Battery-less wireless communication system and method |
| CN118713599A (en) * | 2024-08-28 | 2024-09-27 | 成都世源频控技术股份有限公司 | Low phase noise coaxial medium oscillating circuit |
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Application publication date: 20190621 |