CN2831618Y - Super-regeneration receiving circuit - Google Patents
Super-regeneration receiving circuit Download PDFInfo
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- CN2831618Y CN2831618Y CN 200520133424 CN200520133424U CN2831618Y CN 2831618 Y CN2831618 Y CN 2831618Y CN 200520133424 CN200520133424 CN 200520133424 CN 200520133424 U CN200520133424 U CN 200520133424U CN 2831618 Y CN2831618 Y CN 2831618Y
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Abstract
The utility model relates to a super-regeneration receiving circuit. The utility model forms a self-adaptive voltage negative feedback base bias circuit through the mode that a base pole of a high frequency transistor in a capacitance three-point type oscillator is connected with a resistor and a low-frequency decoupling circuit; thus, the utility model can adapt voltage fluctuation and temperature change of large range. Furthermore, an antenna is directly connected to an emission pole of the high frequency transistor after passing through a DC-isolating capacitor to effectively isolate a collecting electrode parallel resonance circuit and the antenna; the resonance peak of the collecting electrode parallel resonance circuit is increased; that is to say, under the condition of same oscillation power, the resonance peak can be increased in large amplitude. The receiving sensitivity is enhanced; energy outwards radiating high-frequency signals via the antenna is reduced. Besides output voltage after detected is increased, simultaneously the working current of an oscillation circuit is also reduced; the power consumption of the whole machine is largely reduced. The utility model can prolong the service life of batteries in occasions taking the batteries to supply power.
Description
Technical field
The utility model relates to a kind of Armstrong circuit.
Technical background
Existing Armstrong circuit, receiving sensitivity and circuit adaptive performance also do not reach requirement in several applications, if raising sensitivity or coverage then need to improve the oscillation intensity of circuit, also improved amount of radiation, simultaneously because of custom circuit with the aerial signal decanting point, be connected with the Armstrong circuit high frequency oscillation circuit, cause high-frequency oscillation signal to pass through a large amount of radiation of antenna aloft, can't be by the low radiation standard of American-European countries.
The utility model content
The utility model has overcome above-mentioned shortcoming, and a kind of highly sensitive, adaptive ability is strong, radiation is low Armstrong circuit is provided.
The technical scheme in the invention for solving the technical problem is: comprise the receiving circuit that connects in turn, first order low-frequency amplifier circuit, second level low-frequency amplifier circuit and shaping circuit, also comprise RC oscillating circuit and a power-saving circuit of connecting in turn, the output that described power-saving circuit links to each other also connects described receiving circuit, be used for providing operating voltage to described receiving circuit, comprise an antenna that is used to receive the superregenerative signal in the described receiving circuit, a capacitance connecting three point type oscillator that includes high frequency transistor, a low frequency decoupling circuit, the output of described antenna is connected in the described capacitance connecting three point type oscillator through a capacitance, the output of described power-saving circuit is connected to an end of described low frequency decoupling circuit after through a resistance, a power filtering capacitor is connected between the output and ground end of described power-saving circuit, the base stage of described high frequency transistor links to each other with described low frequency decoupling circuit through another resistance, and the collector electrode of described high frequency transistor outputs in the described first order low-frequency amplifier circuit after through an antiresonant circuit.
Described antenna can be connected to the transistorized emitter of described capacitance connecting three point type oscillator medium-high frequency through behind the described capacitance, described low frequency decoupling circuit is the resistance and the electric capacity of series connection, described high frequency capacitance bikini oscillator comprises described high frequency transistor, described antiresonant circuit and an electric capacity, the base stage of described high frequency transistor is connected to after through a resistance in the described low frequency decoupling circuit between the resistance and electric capacity, collector electrode is through the other end of resistance in the described low frequency decoupling circuit of described antiresonant circuit, and described electric capacity is connected in parallel between the collector and emitter of described high frequency transistor.
Described antiresonant circuit can comprise an inductance and electric capacity that is connected in parallel.
Described first order low-frequency amplifier circuit can comprise a logic inverter and the negative feedback resistor and the electric capacity that are connected in parallel on described logic inverter input/output terminal.
The utility model passes through in the transistorized base stage of described capacitance connecting three point type oscillator medium-high frequency, be connected with resistance and low frequency decoupling circuit, constitute adaptive voltage negative feedback base bias circuit, make the utility model can adapt in a big way voltage fluctuation and variations in temperature, and, described antenna is through being directly connected to the emitter of described high frequency transistor behind the capacitance, collector electrode antiresonant circuit and antenna have been carried out effective isolation, increased the resonance peak of antiresonant circuit, promptly under the situation of same hunting power, resonance peak can just add significantly, greatly improved the sensitivity that receives, and reduced by the energy of antenna to the external radiation high-frequency signal, except the output voltage after the increase detection, also reduced the operating current of oscillating circuit simultaneously, the complete machine power consumption is greatly reduced, adopt battery powered occasion, can greatly prolong the useful life of battery.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model
Fig. 2 is circuit theory diagrams of the present utility model
Embodiment
As shown in Figure 1, comprise the receiving circuit, first order low-frequency amplifier circuit, second level low-frequency amplifier circuit and the shaping circuit that connect in turn, also comprise RC oscillating circuit and a power-saving circuit of connecting in turn, the output that described power-saving circuit links to each other also connects described receiving circuit, is used for providing operating voltage to described receiving circuit.
The physical circuit principle as shown in Figure 2, comprise an antenna T who is used to receive the superregenerative signal in the described receiving circuit, a capacitance connecting three point type oscillator that comprises high frequency transistor Q1, a low frequency decoupling circuit that constitutes by the resistance R 2 and the capacitor C 2 of series connection, the output of described antenna is connected to the emitter of described high frequency transistor Q1 through a capacitance C3, the output of described power-saving circuit is connected to an end of resistance R 2 in the described low frequency decoupling circuit after through a resistance R 1, a capacitor C 1 is connected between the cold junction (left end of R1 among the figure) and ground of described resistance R 1, and an end of resistance R 3 is connected described resistance R 2, between the electric capacity R2.The other end is connected to described high frequency transistor Q1 base stage, the other end ground connection of described capacitor C 2.Described high frequency capacitance bikini oscillator comprises described high frequency transistor Q1, inductance L 2 and two capacitor C 6, C7, the collector electrode of described high frequency transistor Q1 is through being connected to the hot junction (right-hand member of R1 among the figure) of described resistance R 1 after the described inductance L 2, described capacitor C 6 is in parallel with described inductance L 2, and capacitor C 7 is connected in parallel between the collector and emitter of described high frequency transistor Q1.The emitter of described high frequency transistor Q1 is series inductance L3 and resistance R 4 back ground connection successively, and a capacitor C 8 is connected in parallel on the two ends of described resistance R 4.The two ends of high frequency positive feedback coupling capacitance C4 are connected to the hot junction of base stage and the resistance R 1 of described triode Q1, and the two ends of intermittent oscillation capacitor C 5 are connected between the base stage and ground end of described triode Q1.
Wherein, described high frequency transistor Q1, first act as the 433MHz high-frequency generator, and second act as the superregenerative blocking oscillator, and the 3rd act as the linear envelope detector of high frequency carrier.Described capacitor C 1 is a power filtering capacitor, and makes the cold junction (i.e. resistance R 1 left end among the figure) of R1 keep exchanging earth potential.Described capacitor C 2, resistance R 2 are formed low frequency and are moved back the lotus root circuit, stop the low frequency output signal on described resistance R 1 hot junction (i.e. resistance R 1 right-hand member among the figure) to be added to described high frequency transistor Q1 base stage by described resistance R 2, R3, and avoided forming differential circuit with capacitor C 4, the output wave mode after the change detection.Described capacitor C 3 because of the high frequency hot end with triode Q1 emitter is connected, has participated in the higher-order of oscillation for antenna coupling and partiting dc capacitor, and its capacity can be injected to principle with aerial signal again not influence the higher-order of oscillation.Described capacitor C 4 is a high frequency positive feedback coupling capacitance, the high-frequency signal on described inductance L 2, capacitor C 5 shunt-resonant circuits is fed back to the base stage of high frequency transistor Q1.Described capacitor C 5 is the intermittent oscillation electric capacity of self-gravitation state, link to each other with resistance R 3 and be connected across the base stage of described high frequency transistor Q1, the charge and discharge loop that emitter is formed the self-gravitation state, increase capacitance, can reduce the frequency of self-gravitation state, reduce capacitance, can improve the frequency of self-gravitation state, its capacity need be determined according to the low frequency signal of required demodulation.Though capacitor C 5 inserts the Q1 base stage jointly with C4, but because of C5 is a large bulk capacitance, the existence of equivalent inductance is arranged on manufacturing process, so C5 has certain impedance to high-frequency signal, simultaneously because of the high frequency positive feedback energy of transistor Q1 by capacitor C 4 required feedbacks seldom, can keep normal vibration, so the existence of capacitor C 5 can not switch to ground fully with the high frequency current potential of Q1 base stage.
The capacitance connecting three point type oscillator that described capacitor C 6, C7, inductance L 2 and high frequency transistor Q1 form, with required 433MHz high-frequency signal reception carrying out frequency-selecting resonance, the receiving sensitivity of receiver, depend primarily on the quality factor q and the oscillation intensity in this loop, Q value height is then highly sensitive, equally, then sensitivity is also high by force in vibration.Described inductance L 3 makes high frequency transistor Q1 emitter keep the high frequency high potential state, is keeping the direct current channel of Q1 emitter simultaneously.Resistance R 4 is the direct current negative feedback resistor of Q1 emitter, keeps the direct current of Q1 circuit and the stability after the variations in temperature, changes the oscillation intensity that this resistance can change oscillating circuit.Capacitor C 8 is the interchange shunt capacitance of R4, makes and does not produce the high frequency pressure drop on the R4.Resistance R 1 is the alternating current-direct current load of Q1 circuit, with resistance R 2, R3 high frequency transistor Q1 is formed voltage negative feedback circuit simultaneously, resistance R 1 numerical value is big, the low frequency signal amplitude of output is just high, but too conference influences the supply power voltage of Q1 collector electrode, higher-order of oscillation amplitude is reduced,, be as the criterion with empirical value so in side circuit, need according to actual needs.
In the above-mentioned receiving circuit, base stage with described triode Q1, the direct current biasing resistance that constitutes by two resistor voltage divider circuits, change into by resistance R 1, R2, the adaptive voltage negative feedback disjunction mark biasing circuit that R3 constitutes, make circuit can adapt in a big way voltage fluctuation and variations in temperature, principle analysis is as follows: as rising because of supply voltage or the temperature rising, cause that Q1 base current Ib increases, emitting stage electric current I e is also increased, the also corresponding increase of collector current Ic, the electric current I r1 on the R1 that then flows through also increases, and then the voltage Vr1 on the R1 also increases, make Vr2, the Vr3 both end voltage descends, Q1 base current Ib also reduces thereupon, causes Ie, Ic, the Ir1 electric current reduces, after each part voltage of circuit reaches relative equilibrium, circuit just settles out, and vice versa.By above analysis as can be known, this circuit is changed, and can improve the stability of circuit to a great extent, especially for streamline production occasion in enormous quantities, even each batch components and parts have very big error, also be easier to guarantee to produce in batches out the consistency of product quality.Equally, to being transported to each regional product of the world, also can adapt to the different serviceability temperatures of various places.
Simultaneously, in this circuit, the antenna decanting point is positioned over described high frequency transistor Q1 emitter terminal, make the high frequency parallel oscillatory circuit of Q1 collector electrode not be subjected to the influence of antenna loop reflected umpedance, can keep higher Q of resonance circuit value, increase the resonance peak of high frequency parallel oscillatory circuit, under the situation of same hunting power, resonance peak can increase considerably, and has greatly improved receiving sensitivity.And, because the antenna decanting point is positioned over the Q1 emitter terminal, high frequency oscillation circuit on the Q1 collector electrode and the antenna loop on the emitter are isolated, make the oscillation circuit of Q1 collector electrode, reduced by the ability of antenna, can reach the low radiation standard of American-European countries to the external radiation hihgs.Moreover, because Q1 collector electrode resonant tank is with after antenna loop separates, the raising of resonant tank quality factor q value, the energy that makes resonant tank keep vibration greatly reduces, so load resistance R1 resistance can be increased, removes the output voltage that can increase after the detection, also reduced simultaneously the operating current of oscillating circuit, the complete machine power consumption is greatly reduced, adopting battery powered occasion, can greatly prolong the useful life of battery.
Comprise a logic inverter IC1A in the described first order low-frequency amplifier circuit, resistance R 6, a capacitor C 10 all are connected in parallel on the input/output terminal of described logic inverter.After connecting successively, resistance R 5, capacitor C 9 be connected the output of described receiving circuit and the input of first order low-frequency amplifier circuit.Wherein, resistance R 5, capacitor C 9 are the low frequency signal output loop after the receiving circuit demodulation, the numerical value of resistance R 5 can not be too little, otherwise can influence the quality factor q value of high frequency oscillation circuit, when the numerical value of R5 is too big, the pressure drop meeting of low frequency output signal on R5 increases, so need to choose by the actual demand situation.Capacitor C 9 is the stopping direct current coupling capacitor, in the level direct current channel, low frequency signal is delivered to next stage before and after cutting off.Described resistance R 6, capacitor C 10 are negative feedback resistor, the electric capacity of logic inverter IC1A, form first order low-frequency amplifier circuit with IC1A, the low frequency signal that IC1A is come out the demodulation of Q1 circuit amplifies, by C10 unwanted high-frequency signal is carried out negative-feedback process simultaneously, what make that the next stage amplifier receives has only low frequency signal basically, does not almost have high-frequency signal.Described capacitor C 10 is not by the high-frequency signal direct bypass of existing custom circuit after with detection down, feed back but carry out high frequency negative by the negative-feedback circuit that inserts logic inverter IC1A, make high-frequency signal on IC1A, not have amplification, with after reaching high-frequency signal and amplifying by the second level, also do not reach the 1/2 supply voltage upset level that promotes the next stage shaping circuit, because the low frequency output circuit is the big electric capacity of following ground filtering not, the input impedance of IC1A just can be done very highly, the big numerical value resistance of resistance R 5 is concerning the high input impedance of first order amplifier, almost can ignore, low frequency signal after the detection, can amplify by the almost undamped first order amplifier that enters, play a significantly greater role for improving machine sensitivity and signal to noise ratio.
Resistance R 7, R8 and logic inverter IC1B form second level low-frequency amplifier circuit, low frequency signal are once amplified again, so that satisfy the voltage magnitude of next stage waveform shaping.Logic inverter IC1C is the low-frequency channel waveform shaping circuit, and mainly the signal that prime is sent here carries out exporting after the amplitude limit shaping, so that the decoding circuit of next stage can correctly be discerned.
Resistance R 9, R10, capacitor C 12, logic inverter IC1F, IC1E form described RC oscillator, described logic inverter IC1F, IC1E are connected in series, one end of resistance R 9, R10, capacitor C 12 all links to each other, and the other end is connected to the output of input, output and the IC1E of described logic inverter IC1F.Can change frequency of oscillation by the numerical value that changes R10, C12, the oscillating circuit as if constitute 2Hz by the peek value then can provide 0.5 second control cycle for power-saving circuit.
Described power-saving circuit comprises monostable time delay control circuit and power down mode executive circuit, capacitor C 13, resistance R 11, logic inverter IC1D form the monostable time delay control circuit, when the output high level of IC1E output, the input that is connected to logic inverter IC1D by capacitor C 13 provides high level, the output switching activity that makes IC1D is a low level, drive the triode Q2 conducting in the described power down mode executive circuit, operating voltage is provided for the Q1 in the receiving circuit.When resistance R 11 is discharged to 1/2VCC when following with the high level of capacitor C 13, the output of IC1D is replied high level, ends between the CE of triode Q2, and the supply of Q1 no-voltage quits work, and waits for the next work period.Can decide wherein monostable time of delay by the value of C13 and R11, can be set at 0.2 second.Resistance R 12, R13 and described triode Q2 form the power down mode executive circuit, and the base stage of described triode Q2 is connected to the output control of described logic inverter IC1D by resistance R 12, work when the output electronegative potential of IC1D, end during high potential.Resistance R 13 has guaranteed reliably ending of Q2 for the Icbo of triode Q2 provides leakage path.Also having an electrochemical capacitor E1 is power filtering capacitor, is connected between the emitter and ground end of described triode Q2, makes the positive and negative terminal of power supply keep equipotential.
More than Armstrong circuit provided by the utility model is described in detail, used specific case herein principle of the present utility model and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (4)
1. Armstrong circuit, comprise the receiving circuit that connects in turn, first order low-frequency amplifier circuit, second level low-frequency amplifier circuit and shaping circuit, also comprise RC oscillating circuit and a power-saving circuit of connecting in turn, the output that described power-saving circuit links to each other also connects described receiving circuit, be used for providing operating voltage to described receiving circuit, it is characterized in that: comprise an antenna that is used to receive the superregenerative signal in the described receiving circuit, a capacitance connecting three point type oscillator that includes high frequency transistor, a low frequency decoupling circuit, the output of described antenna is connected in the described capacitance connecting three point type oscillator through a capacitance, the output of described power-saving circuit is connected to an end of described low frequency decoupling circuit after through a resistance, a power filtering capacitor is connected between the output and ground end of described power-saving circuit, the base stage of described high frequency transistor links to each other with described low frequency decoupling circuit through another resistance, and the collector electrode of described high frequency transistor outputs in the described first order low-frequency amplifier circuit after through an antiresonant circuit.
2. Armstrong circuit according to claim 1, it is characterized in that: described antenna is connected to the transistorized emitter of described capacitance connecting three point type oscillator medium-high frequency through behind the described capacitance, described low frequency decoupling circuit is the resistance and the electric capacity of series connection, described high frequency capacitance bikini oscillator comprises described high frequency transistor, described antiresonant circuit and an electric capacity, the base stage of described high frequency transistor is connected to after through a resistance in the described low frequency decoupling circuit between the resistance and electric capacity, collector electrode is through the other end of resistance in the described low frequency decoupling circuit of described antiresonant circuit, and described electric capacity is connected in parallel between the collector and emitter of described high frequency transistor.
3. Armstrong circuit according to claim 2 is characterized in that: described antiresonant circuit comprises an inductance and electric capacity that is connected in parallel.
4. according to claim 1 or 2 or 3 described Armstrong circuits, it is characterized in that: described first order low-frequency amplifier circuit comprises a logic inverter and the negative feedback resistor and the electric capacity that are connected in parallel on described logic inverter input/output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520133424 CN2831618Y (en) | 2005-11-22 | 2005-11-22 | Super-regeneration receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520133424 CN2831618Y (en) | 2005-11-22 | 2005-11-22 | Super-regeneration receiving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN2831618Y true CN2831618Y (en) | 2006-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520133424 Expired - Fee Related CN2831618Y (en) | 2005-11-22 | 2005-11-22 | Super-regeneration receiving circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079648B (en) * | 2007-06-28 | 2010-05-26 | 芯科国际私人有限公司 | An ultra-regeneration receiving device |
| CN102355767A (en) * | 2011-07-21 | 2012-02-15 | 桂海进 | LED illumination lamp with wireless remote control function |
| CN109407085A (en) * | 2018-12-25 | 2019-03-01 | 深圳贝仕达克技术股份有限公司 | A kind of body induction circuit |
| CN117118468A (en) * | 2023-08-07 | 2023-11-24 | 长春理工大学 | Self-adaptive receiving device based on oscillation control signal |
-
2005
- 2005-11-22 CN CN 200520133424 patent/CN2831618Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079648B (en) * | 2007-06-28 | 2010-05-26 | 芯科国际私人有限公司 | An ultra-regeneration receiving device |
| CN102355767A (en) * | 2011-07-21 | 2012-02-15 | 桂海进 | LED illumination lamp with wireless remote control function |
| CN109407085A (en) * | 2018-12-25 | 2019-03-01 | 深圳贝仕达克技术股份有限公司 | A kind of body induction circuit |
| CN109407085B (en) * | 2018-12-25 | 2024-03-15 | 深圳贝仕达克技术股份有限公司 | Human body induction circuit |
| CN117118468A (en) * | 2023-08-07 | 2023-11-24 | 长春理工大学 | Self-adaptive receiving device based on oscillation control signal |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |