CN104868849A - Band-pass filtering dual-oscillation system based on Colpitts oscillator circuit - Google Patents
Band-pass filtering dual-oscillation system based on Colpitts oscillator circuit Download PDFInfo
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- CN104868849A CN104868849A CN201510307257.6A CN201510307257A CN104868849A CN 104868849 A CN104868849 A CN 104868849A CN 201510307257 A CN201510307257 A CN 201510307257A CN 104868849 A CN104868849 A CN 104868849A
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Abstract
The invention discloses a band-pass filtering dual-oscillation system based on a Colpitts oscillator circuit. The band-pass filtering dual-oscillation system comprises a buffer circuit, a signal conversion circuit, a signal amplification circuit connected to the signal conversion circuit, a band-pass filtering circuit connected to the signal amplification circuit, and a phase shift processing circuit arranged between the buffer circuit and the band-pass filtering circuit. The band-pass filtering dual-oscillation system is characterized in that the Colpitts oscillator circuit is connected between the band-pass filtering circuit and the phase shift processing circuit in series. By adopting the phase shift processing circuit, the filtering stability of the oscillating circuit can be improved, and the phenomenon of incomplete filtering of the system due to voltage instability is avoided. Meanwhile, an LM741 integrated chip with high sensitivity and low price is further adopted. The band-pass filtering dual-oscillation system adopts the Colpitts oscillator circuit as an auxiliary oscillating circuit of the system, so that a frequency signal sent by the system is more stable.
Description
Technical field
The present invention relates to a kind of oscillatory system, specifically refer to the two oscillatory system of bandpass filtering based on capacitive feedback bikini oscillating circuit.
Background technology
Along with the development of electronic technology, oscillator is more and more extensive as producing the electronic component application repeating electric signal (normally sinusoidal wave or square wave).Its kind is a lot, can be divided into self-excited oscillator, driven oscillator by vibratory stimulation mode; Resistance-capacitance oscillator, LC oscillator, crystal oscillator, fork generator etc. can be divided into by circuit structure; The oscillators such as sine wave, square wave, sawtooth waveforms can be divided into by output waveform.Be widely used in the aspects such as electronics industry, medical treatment, scientific research at present.
But its frequency of oscillation of traditional oscilator system is also unstable, have impact on its scope of application.
Summary of the invention
The object of the invention is to the defect solving traditional its frequency of oscillation instability of oscilator system, provide a kind of bandpass filtering based on capacitive feedback bikini oscillating circuit two oscillatory system.
Object of the present invention is by following technical proposals reality: the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit, it is by buffer circuit, signal conversion circuit, the signal amplification circuit be connected with signal conversion circuit, the bandwidth-limited circuit be connected with signal amplification circuit, be arranged on the phase shift treatment circuit between buffer circuit and bandwidth-limited circuit, and the capacitive feedback bikini oscillating circuit be serially connected between bandwidth-limited circuit and phase shift treatment circuit forms.
Further, described capacitive feedback bikini oscillating circuit is by triode VT4, triode VT5, N pole is connected with the collector electrode of triode VT4, the diode D3 that P pole is then connected with bandwidth-limited circuit, one end is connected with the P pole of diode D3, the resistance R22 that the other end is then connected with the base stage of triode VT4, positive pole is connected with the collector electrode of triode VT5 after oscillator X1, the polar capacitor C14 of minus earth, one end is connected with the emitter of triode VT4, the resistance R23 that the other end is then connected with the negative pole of polar capacitor C14 after resistance R24, positive pole is connected with the emitter of triode VT4, the polar capacitor C13 that negative pole is then connected with the collector electrode of triode VT5, the controllable impedance L1 be in parallel with polar capacitor C13, N pole is connected with the emitter of triode VT4, the diode D4 that P pole is then connected with the negative pole of polar capacitor C14 after resistance R25, and positive pole is connected with the emitter of triode VT5, the polar capacitor C15 that negative pole is then connected with the negative pole of polar capacitor C14 forms, connect 15V voltage while the emitter of described triode VT4 is connected with phase shift treatment circuit, its collector electrode is then connected with the tie point of resistance R24 with resistance R23, the base stage of described triode VT5 is then connected with the collector electrode of triode VT4, its emitter is then connected with the P pole of diode D4.
Described phase shift treatment circuit is by phase shift chip U1, triode VT3, triode VT2, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R15 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R16, the polar capacitor C10 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R14, the polar capacitor C8 that negative pole is connected with the collector electrode of triode VT3, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C9 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R13 that the other end is connected with the collector electrode of triode VT2, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT3, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT2 forms, the VCC+ pin of described phase shift chip U1 is connected with bandwidth-limited circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R16, the emitter of triode VT3 is connected with the base stage of triode VT2, the collector electrode of triode VT2 is connected with the emitter of triode VT4, and the negative pole of electric capacity C10 is connected with buffer circuit.
Described signal conversion circuit is by conversion chip K1, transformer T1, be serially connected in the electric capacity C1 between transformer T1 secondary Same Name of Ends and non-same polarity, the electric capacity C2 be in parallel with electric capacity C1, collector electrode is connected with the OSC1 pin of conversion chip K1, emitter is connected with the OSC2 pin of conversion chip K1 after resistance R1, the triode VT1 that base stage is then connected with the OSC2 pin of conversion chip K1 after fundamental quartz crystal X, and one end is connected with signal amplification circuit with the OUT2 pin of conversion chip K1 simultaneously, the resistance R2 that the other end is connected with the base stage of triode VT1 forms, the base stage of described triode VT1 is connected with external power source, the IN1 pin of conversion chip K1 is connected with the non-same polarity of transformer T1 secondary, its IN2 pin is then connected with the Same Name of Ends of transformer T1 secondary, GND pin is connected with the non-same polarity on the former limit of transformer T1, VCC pin is connected with the base stage of triode VT1, OUT2 pin is all connected with signal amplification circuit with OUT1 pin, the non-same polarity ground connection on the described former limit of transformer T1, its Same Name of Ends is then as the input of this signal conversion circuit.
Described signal amplification circuit is by amplifier P1, amplifier P2, be serially connected in the resistance R6 between the inverting input of amplifier P1 and output, one end is connected with the normal phase input end of amplifier P1, the resistance R5 of other end ground connection, be serially connected in the resistance R4 between the inverting input of amplifier P2 and output, and one end is connected with the normal phase input end of amplifier P2, the resistance R3 of other end ground connection forms; The inverting input of described amplifier P1 is connected with the OUT1 pin of conversion chip K1, its output is then connected with bandwidth-limited circuit, and the inverting input of amplifier P2 is connected with the OUT2 pin of conversion chip K1, its output is then connected with bandwidth-limited circuit.
Described bandwidth-limited circuit is by the first process chip K2, second process chip K3, positive pole is connected with the OUT pin of the first process chip K2, the electric capacity C4 that negative pole is connected with the IN2 pin of the second process chip K3 after potentiometer R7 through resistance R8, positive pole is connected with the IN1 pin of the first process chip K2, the electric capacity C5 that negative pole is then connected with the output of amplifier P1, one end is connected with the IN1 pin of the first process chip K2, the resistance R10 that the other end is connected with the OUT pin of the first process chip K2, positive pole is connected with the IN2 pin of the second process chip K3, the electric capacity C3 that negative pole is connected with the IN2 pin of the first process chip K2 after resistance R9, positive pole is connected with OUT pin with the V+ pin of the second process chip K3 simultaneously, the electric capacity C6 that negative pole is connected with the IN2 pin of the second process chip K3 after potentiometer R11 through resistance R12, and positive pole is connected with the IN1 pin of the second process chip K3, the electric capacity C7 that negative pole is then connected with the OUT pin of the first process chip K2 forms, the V+ pin of described first process chip K2 is connected with external power source, V-pin ground connection, the IN2 pin of the second process chip K3 is simultaneously with the output of amplifier P2 and the VCC+ pin of phase shift chip U1 is connected, its V-pin ground connection, OUT pin are then connected with the P pole of diode D3, the minus earth of electric capacity C3.
Described buffer circuit is by transformer T2, dual-gate field-effect pipe Q1, positive pole is connected with a grid of dual-gate field-effect pipe Q1, the electric capacity C11 of minus earth, the resistance R17 be in parallel with electric capacity C11, one end is connected with the positive pole of electric capacity C11, the resistance R18 that the other end is connected with the Same Name of Ends on the former limit of transformer T2 after resistance R19, one end is connected with the b grid of dual-gate field-effect pipe Q1, the resistance R20 that the other end is connected with the source electrode of dual-gate field-effect pipe Q1 after electric capacity C12, and one end is connected with the source electrode of dual-gate field-effect pipe Q1, the resistance R21 that the other end is connected with the tie point of electric capacity C12 with resistance R20 forms, the b grid of described dual-gate field-effect pipe Q1 is also connected with the negative pole of polar capacitor C10, it drains and to be connected with the non-same polarity on the former limit of transformer T2, the Same Name of Ends ground connection of transformer T2 secondary, and its non-same polarity is then as the output of this buffer circuit, the tie point ground connection of resistance R20 and electric capacity C12.
In order to reach better result of use, this phase shift chip U1 is preferably LM741 integrated chip, described conversion chip K1 is then preferably NE602 integrated circuit, and the first described process chip K2 and the second process chip K3 is all preferably LM742 integrated circuit and realizes.
The present invention compared with prior art has the following advantages and beneficial effect:
1, present invention employs phase shift treatment circuit, it can improve oscillating circuit filter wave stability, avoids system to cause the halfway existing picture of filtering because of voltage instability.
2, it is highly sensitive to present invention employs LM741 integrated chip, cheap.
3, the present invention is by adjustment potentiometer R7 and potentiometer R11, namely can adjust the frequency filtering of oscillatory system, expand the scope of application of oscillatory system.
4, the present invention adopts capacitive feedback bikini oscillating circuit as auxiliary oscillator circuit of the present invention, and its frequency signal that the present invention can be made to send is more stable.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, the present invention is by buffer circuit, signal conversion circuit, the signal amplification circuit be connected with signal conversion circuit, the bandwidth-limited circuit be connected with signal amplification circuit, be arranged on the phase shift treatment circuit between buffer circuit and bandwidth-limited circuit, and the capacitive feedback bikini oscillating circuit be serially connected between bandwidth-limited circuit and phase shift treatment circuit forms.
Wherein, described phase shift treatment circuit is by phase shift chip U1, triode VT3, triode VT2, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R15 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R16, the polar capacitor C10 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R14, the polar capacitor C8 that negative pole is connected with the collector electrode of triode VT3, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C9 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R13 that the other end is connected with the collector electrode of triode VT2, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT3, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT2 forms.
During connection, the VCC+ pin of this phase shift chip U1 needs to be connected with bandwidth-limited circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R16, and the emitter of triode VT3 is connected with the base stage of triode VT2.The collector electrode of triode VT2 is connected with capacitive feedback bikini oscillating circuit, to receive the oscillator signal that capacitive feedback bikini oscillating circuit sends.And the negative pole of electric capacity C10 is connected with buffer circuit.
This phase shift treatment circuit, can improve oscillating circuit filter wave stability, avoids system to cause the halfway existing picture of filtering because of voltage instability.In order to better existing as object of the present invention, described phase shift chip U1 is preferably LM741 integrated chip, and it is highly sensitive, cheap.
Described signal conversion circuit is by conversion chip K1, and transformer T1, resistance R1, resistance R2, triode VT1, electric capacity C1, electric capacity C2 and fundamental quartz crystal X form.
During connection, this electric capacity C1 is serially connected between transformer T1 secondary Same Name of Ends and non-same polarity, and electric capacity C2 is then in parallel with electric capacity C1.This electric capacity C1 and electric capacity C2 can be used for carrying out filtering process to input voltage signal.The collector electrode of triode VT1 is connected with the OSC1 pin of conversion chip K1, its emitter is connected with the OSC2 pin of conversion chip K1 after resistance R1, its base stage is then connected with the OSC2 pin of conversion chip K1 after fundamental quartz crystal X, and one end of resistance R2 is connected with signal amplification circuit with the OUT2 pin of conversion chip K1 simultaneously, its other end is connected with the base stage of triode VT1.
Simultaneously, the base stage of this triode VT1 is connected with external power source, the IN1 pin of conversion chip K1 is connected with the non-same polarity of transformer T1 secondary, its IN2 pin is then connected with the Same Name of Ends of transformer T1 secondary, GND pin is connected with the non-same polarity on the former limit of transformer T1, VCC pin is connected with the base stage of triode VT1, OUT2 pin is all connected with signal amplification circuit with OUT1 pin, described transformer T1 former limit non-same polarity ground connection, its Same Name of Ends is then as input.
This signal conversion circuit can make oscillatory system be applicable to very wide frequency range, expands the application scenario of oscillatory system.In order to better implement the present invention, this conversion chip K1 is preferably NE602 integrated circuit to realize, and this model integrated circuit is easy to use and have good signal to noise ratio and third order intermodulation index.
Be provided with signal amplification circuit in system, it can be amplified inputted signal, ensures that the signal exported maintains constant numerical value.It is by amplifier P1, amplifier P2, be serially connected in the resistance R6 between the inverting input of amplifier P1 and output, one end is connected with the normal phase input end of amplifier P1, the resistance R5 of other end ground connection, be serially connected in the resistance R4 between the inverting input of amplifier P2 and output, and one end is connected with the normal phase input end of amplifier P2, the resistance R3 of other end ground connection forms; The inverting input of described amplifier P1 is connected with the OUT1 pin of conversion chip K1, its output is then connected with bandwidth-limited circuit, and the inverting input of amplifier P2 is connected with the OUT2 pin of conversion chip K1, its output is then connected with bandwidth-limited circuit.
Described bandwidth-limited circuit is by the first process chip K2, second process chip K3, positive pole is connected with the OUT pin of the first process chip K2, the electric capacity C4 that negative pole is connected with the IN2 pin of the second process chip K3 after potentiometer R7 through resistance R8, positive pole is connected with the IN1 pin of the first process chip K2, the electric capacity C5 that negative pole is then connected with the output of amplifier P1, one end is connected with the IN1 pin of the first process chip K2, the resistance R10 that the other end is connected with the OUT pin of the first process chip K2, positive pole is connected with the IN2 pin of the second process chip K3, the electric capacity C3 that negative pole is connected with the IN2 pin of the first process chip K2 after resistance R9, positive pole is connected with OUT pin with the V+ pin of the second process chip K3 simultaneously, the electric capacity C6 that negative pole is connected with the IN2 pin of the second process chip K3 after potentiometer R11 through resistance R12, and positive pole is connected with the IN1 pin of the second process chip K3, the electric capacity C7 that negative pole is then connected with the OUT pin of the first process chip K2 forms.
The V+ pin of described first process chip K2 is connected with external power source, V-pin ground connection, the IN2 pin of the second process chip K3 is simultaneously with the output of amplifier P2 and the VCC+ pin of phase shift chip U1 is connected, its V-pin ground connection, OUT pin are then connected with capacitive feedback bikini oscillating circuit, the minus earth of electric capacity C3.
This bandwidth-limited circuit is formed by the first process chip K2 and the second process chip K3 cascade, and it forms two identical RC filters, therefore can improve the sensitivity of oscillatory system filtering greatly, thus reduce the distortion factor of system.Meanwhile, as long as the potentiometer R7 in Circuit tuning and potentiometer R11, get final product the frequency filtering of Circuit tuning.In order to reach better implementation result, this first process chip K2 and the second process chip K3 all adopts LM742 integrated circuit to realize.
Wherein, buffer circuit is by transformer T2, dual-gate field-effect pipe Q1, positive pole is connected with a grid of dual-gate field-effect pipe Q1, the electric capacity C11 of minus earth, the resistance R17 be in parallel with electric capacity C11, one end is connected with the positive pole of electric capacity C11, the resistance R18 that the other end is connected with the Same Name of Ends on the former limit of transformer T2 after resistance R19, one end is connected with the b grid of dual-gate field-effect pipe Q1, the resistance R20 that the other end is connected with the source electrode of dual-gate field-effect pipe Q1 after electric capacity C12, and one end is connected with the source electrode of dual-gate field-effect pipe Q1, the resistance R21 that the other end is connected with the tie point of electric capacity C12 with resistance R20 forms, the b grid of described dual-gate field-effect pipe Q1 is also connected with the negative pole of polar capacitor C10, it drains and to be connected with the non-same polarity on the former limit of transformer T2, the Same Name of Ends ground connection of transformer T2 secondary, its non-same polarity then as the output of this buffer circuit, the tie point ground connection of resistance R20 and electric capacity C12.Can load effect in effective anti-locking system and the existing picture of frequency drift that produces because of load variations by the effect of buffer circuit.
Capacitive feedback bikini oscillating circuit then by triode VT4, triode VT5, resistance R22, resistance R23, resistance R24, resistance R25, polar capacitor C13, polar capacitor C14, polar capacitor C15, diode D3, diode D4, controllable impedance L1 and oscillator X1 form.
During connection, the N pole of this diode D3 is connected with the collector electrode of triode VT4, its P pole is then connected with the OUT pin of the second process chip K3, one end of resistance R22 is connected with the P pole of diode D3, its other end is then connected with the base stage of triode VT4, the positive pole of polar capacitor C14 is connected with the collector electrode of triode VT5 after oscillator X1, its minus earth, one end of resistance R23 is connected with the emitter of triode VT4, its other end is then connected with the negative pole of polar capacitor C14 after resistance R24, the positive pole of polar capacitor C13 is connected with the emitter of triode VT4, its negative pole is then connected with the collector electrode of triode VT5, controllable impedance L1 is then in parallel with polar capacitor C13, the N pole of diode D4 is connected with the emitter of triode VT4, its P pole is then connected with the negative pole of polar capacitor C14 after resistance R25, the positive pole of polar capacitor C15 is connected with the emitter of triode VT5, its negative pole is then connected with the negative pole of polar capacitor C14.
Meanwhile, the emitter of described triode VT4 connects 15V voltage while needing to be connected with the collector electrode of triode VT2, and its collector electrode is then connected with the tie point of resistance R24 with resistance R23.The base stage of described triode VT5 is then connected with the collector electrode of triode VT4, its emitter is then connected with the P pole of diode D4.
Wherein, resistance R22 is divider resistance, and it can carry out overvoltage protection to circuit.This triode VT5 is parallel resonance state, and its resonance characteristic then can make oscillator X1 have stable operating frequency.Resistance R23 and resistance R24 and resistance R25 is then biasing resistor, and the bias current of its adjustable triode VT5 base stage, makes it meet job requirement.Meanwhile, polar capacitor C13 and controllable impedance L1 then forms LC loop, and the oscillation intensity of oscillator X1 depends on this LC loop, then can regulate the oscillation intensity of oscillator X1 when regulating controllable impedance L1.In order to reach better implementation result, this triode VT5 can preferentially adopt 3DG11B transistor npn npn to realize.
As mentioned above, just well the present invention can be realized.
Claims (9)
1. based on the two oscillatory system of bandpass filtering of capacitive feedback bikini oscillating circuit, it is by buffer circuit, signal conversion circuit, the signal amplification circuit be connected with signal conversion circuit, the bandwidth-limited circuit be connected with signal amplification circuit, and be arranged on the phase shift treatment circuit composition between buffer circuit and bandwidth-limited circuit, it is characterized in that: between bandwidth-limited circuit and phase shift treatment circuit, be also serially connected with capacitive feedback bikini oscillating circuit, described capacitive feedback bikini oscillating circuit is by triode VT4, triode VT5, N pole is connected with the collector electrode of triode VT4, the diode D3 that P pole is then connected with bandwidth-limited circuit, one end is connected with the P pole of diode D3, the resistance R22 that the other end is then connected with the base stage of triode VT4, positive pole is connected with the collector electrode of triode VT5 after oscillator X1, the polar capacitor C14 of minus earth, one end is connected with the emitter of triode VT4, the resistance R23 that the other end is then connected with the negative pole of polar capacitor C14 after resistance R24, positive pole is connected with the emitter of triode VT4, the polar capacitor C13 that negative pole is then connected with the collector electrode of triode VT5, the controllable impedance L1 be in parallel with polar capacitor C13, N pole is connected with the emitter of triode VT4, the diode D4 that P pole is then connected with the negative pole of polar capacitor C14 after resistance R25, and positive pole is connected with the emitter of triode VT5, the polar capacitor C15 that negative pole is then connected with the negative pole of polar capacitor C14 forms, connect 15V voltage while the emitter of described triode VT4 is connected with phase shift treatment circuit, its collector electrode is then connected with the tie point of resistance R24 with resistance R23, the base stage of described triode VT5 is then connected with the collector electrode of triode VT4, its emitter is then connected with the P pole of diode D4.
2. the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit according to claim 1, it is characterized in that: described phase shift treatment circuit is by phase shift chip U1, triode VT3, triode VT2, one end is connected with the VCC+ pin of phase shift chip U1, the resistance R15 that the other end is connected with the IN1 pin of phase shift chip U1, negative pole is connected with the IN1 pin of phase shift chip U1 after resistance R16, the polar capacitor C10 that positive pole is connected with the IN2 pin of phase shift chip U1, positive pole is connected with the NC pin of phase shift chip U1 after resistance R14, the polar capacitor C8 that negative pole is connected with the collector electrode of triode VT3, positive pole is connected with the OUT pin of phase shift chip U1, the polar capacitor C9 of minus earth, one end is connected with the OUT pin of phase shift chip U1, the potentiometer R13 that the other end is connected with the collector electrode of triode VT2, P pole is connected with the OFF1 pin of phase shift chip U1, the diode D1 that N pole is connected with the base stage of triode VT3, and P pole is connected with the OFF2 pin of phase shift chip U1, the diode D2 that N pole is connected with the emitter of triode VT2 forms, the VCC+ pin of described phase shift chip U1 is connected with bandwidth-limited circuit, VCC-pin ground connection, OUT pin are connected with the sliding end of potentiometer R16, the emitter of triode VT3 is connected with the base stage of triode VT2, the collector electrode of triode VT2 is connected with the emitter of triode VT4, and the negative pole of electric capacity C10 is connected with buffer circuit.
3. the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit according to claim 2, it is characterized in that: described signal conversion circuit is by conversion chip K1, transformer T1, be serially connected in the electric capacity C1 between transformer T1 secondary Same Name of Ends and non-same polarity, the electric capacity C2 be in parallel with electric capacity C1, collector electrode is connected with the OSC1 pin of conversion chip K1, emitter is connected with the OSC2 pin of conversion chip K1 after resistance R1, the triode VT1 that base stage is then connected with the OSC2 pin of conversion chip K1 after fundamental quartz crystal X, and one end is connected with signal amplification circuit with the OUT2 pin of conversion chip K1 simultaneously, the resistance R2 that the other end is connected with the base stage of triode VT1 forms, the base stage of described triode VT1 is connected with external power source, the IN1 pin of conversion chip K1 is connected with the non-same polarity of transformer T1 secondary, its IN2 pin is then connected with the Same Name of Ends of transformer T1 secondary, GND pin is connected with the non-same polarity on the former limit of transformer T1, VCC pin is connected with the base stage of triode VT1, OUT2 pin is all connected with signal amplification circuit with OUT1 pin, the non-same polarity ground connection on the described former limit of transformer T1, its Same Name of Ends is then as the input of this signal conversion circuit.
4. the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit according to claim 3, it is characterized in that: described signal amplification circuit is by amplifier P1, amplifier P2, be serially connected in the resistance R6 between the inverting input of amplifier P1 and output, one end is connected with the normal phase input end of amplifier P1, the resistance R5 of other end ground connection, be serially connected in the resistance R4 between the inverting input of amplifier P2 and output, and one end is connected with the normal phase input end of amplifier P2, the resistance R3 of other end ground connection forms; The inverting input of described amplifier P1 is connected with the OUT1 pin of conversion chip K1, its output is then connected with bandwidth-limited circuit, and the inverting input of amplifier P2 is connected with the OUT2 pin of conversion chip K1, its output is then connected with bandwidth-limited circuit.
5. the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit according to claim 4, it is characterized in that: described bandwidth-limited circuit is by the first process chip K2, second process chip K3, positive pole is connected with the OUT pin of the first process chip K2, the electric capacity C4 that negative pole is connected with the IN2 pin of the second process chip K3 after potentiometer R7 through resistance R8, positive pole is connected with the IN1 pin of the first process chip K2, the electric capacity C5 that negative pole is then connected with the output of amplifier P1, one end is connected with the IN1 pin of the first process chip K2, the resistance R10 that the other end is connected with the OUT pin of the first process chip K2, positive pole is connected with the IN2 pin of the second process chip K3, the electric capacity C3 that negative pole is connected with the IN2 pin of the first process chip K2 after resistance R9, positive pole is connected with OUT pin with the V+ pin of the second process chip K3 simultaneously, the electric capacity C6 that negative pole is connected with the IN2 pin of the second process chip K3 after potentiometer R11 through resistance R12, and positive pole is connected with the IN1 pin of the second process chip K3, the electric capacity C7 that negative pole is then connected with the OUT pin of the first process chip K2 forms, the V+ pin of described first process chip K2 is connected with external power source, V-pin ground connection, the IN2 pin of the second process chip K3 is simultaneously with the output of amplifier P2 and the VCC+ pin of phase shift chip U1 is connected, its V-pin ground connection, OUT pin are then connected with the P pole of diode D3, the minus earth of electric capacity C3.
6. the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit according to claim 5, it is characterized in that: described buffer circuit is by transformer T2, dual-gate field-effect pipe Q1, positive pole is connected with a grid of dual-gate field-effect pipe Q1, the electric capacity C11 of minus earth, the resistance R17 be in parallel with electric capacity C11, one end is connected with the positive pole of electric capacity C11, the resistance R18 that the other end is connected with the Same Name of Ends on the former limit of transformer T2 after resistance R19, one end is connected with the b grid of dual-gate field-effect pipe Q1, the resistance R20 that the other end is connected with the source electrode of dual-gate field-effect pipe Q1 after electric capacity C12, and one end is connected with the source electrode of dual-gate field-effect pipe Q1, the resistance R21 that the other end is connected with the tie point of electric capacity C12 with resistance R20 forms, the b grid of described dual-gate field-effect pipe Q1 is also connected with the negative pole of polar capacitor C10, it drains and to be connected with the non-same polarity on the former limit of transformer T2, the Same Name of Ends ground connection of transformer T2 secondary, and its non-same polarity is then as the output of this buffer circuit, the tie point ground connection of resistance R20 and electric capacity C12.
7. the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit according to any one of claim 2 ~ 6, is characterized in that: described phase shift chip U1 is LM741 integrated chip.
8. the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit according to claim 6, is characterized in that: described conversion chip K1 is NE602 integrated circuit.
9. the two oscillatory system of the bandpass filtering based on capacitive feedback bikini oscillating circuit according to claim 6, is characterized in that: the first described process chip K2 and the second process chip K3 is LM742 integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510307257.6A CN104868849A (en) | 2014-11-26 | 2015-06-06 | Band-pass filtering dual-oscillation system based on Colpitts oscillator circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410691253.8A CN104410365A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based band-pass filtering oscillation system |
| CN2014106912538 | 2014-11-26 | ||
| CN201510307257.6A CN104868849A (en) | 2014-11-26 | 2015-06-06 | Band-pass filtering dual-oscillation system based on Colpitts oscillator circuit |
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| CN104868849A true CN104868849A (en) | 2015-08-26 |
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| CN201410691253.8A Pending CN104410365A (en) | 2014-11-26 | 2014-11-26 | Phase-shift processing based band-pass filtering oscillation system |
| CN201510307257.6A Withdrawn CN104868849A (en) | 2014-11-26 | 2015-06-06 | Band-pass filtering dual-oscillation system based on Colpitts oscillator circuit |
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| CN104410365A (en) * | 2014-11-26 | 2015-03-11 | 成都创图科技有限公司 | Phase-shift processing based band-pass filtering oscillation system |
| CN104506141A (en) * | 2014-11-29 | 2015-04-08 | 成都思茂科技有限公司 | Band-pass filtering oscillating system based on linear driving |
| CN104807515A (en) * | 2015-04-13 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | Overall performance test system based on instantaneous fuel consumption of engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5600283A (en) * | 1995-09-13 | 1997-02-04 | National Semiconductor Corporation | DC isolated differential oscillator having floating capacitor |
| CN104410365A (en) * | 2014-11-26 | 2015-03-11 | 成都创图科技有限公司 | Phase-shift processing based band-pass filtering oscillation system |
| CN204304931U (en) * | 2014-11-26 | 2015-04-29 | 成都创图科技有限公司 | Based on the bandpass filtering oscillatory system of phase shift process |
-
2014
- 2014-11-26 CN CN201410691253.8A patent/CN104410365A/en active Pending
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- 2015-06-06 CN CN201510307257.6A patent/CN104868849A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5600283A (en) * | 1995-09-13 | 1997-02-04 | National Semiconductor Corporation | DC isolated differential oscillator having floating capacitor |
| CN104410365A (en) * | 2014-11-26 | 2015-03-11 | 成都创图科技有限公司 | Phase-shift processing based band-pass filtering oscillation system |
| CN204304931U (en) * | 2014-11-26 | 2015-04-29 | 成都创图科技有限公司 | Based on the bandpass filtering oscillatory system of phase shift process |
Non-Patent Citations (1)
| Title |
|---|
| 徐烨，徐立: "《实用无线电遥控》", 31 July 1997, 人民邮电出版社 * |
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