CN104393839A - Low-distortion oscillating system based on band-pass filtering - Google Patents
Low-distortion oscillating system based on band-pass filtering Download PDFInfo
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- CN104393839A CN104393839A CN201410662467.2A CN201410662467A CN104393839A CN 104393839 A CN104393839 A CN 104393839A CN 201410662467 A CN201410662467 A CN 201410662467A CN 104393839 A CN104393839 A CN 104393839A
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Abstract
The invention discloses a low-distortion oscillating system based on band-pass filtering. The low-distortion oscillating system mainly consists of a signal conversion circuit, a signal amplification circuit connected with the signal conversion circuit and a buffer circuit and is characterized in that a band-pass filtering circuit is arranged between the signal amplification circuit and the buffer circuit; the band-pass filtering circuit consists of a processing chip K2, a processing chip K3, a capacitor C4, a capacitor C5, a resistor R10 and a capacitor C3; one end of the capacitor C4 is connected with the OUT pin of the processing chip K2 and the other end is connected with the pin IN2 of the processing chip K3 via a resistor R8 and a potentiometer R7; one end of the capacitor C5 is connected with the pin IN1 of the processing chip K2 and the other end is connected with the signal amplification circuit; one end of the resistor R10 is connected with the pin IN1 of the processing chip K2 and the other end is connected with the OUT pin of the processing chip K2; one end of the capacitor C3 is connected with the pin IN2 of the processing chip K3 and the other end is connected with the pin IN2 of the processing chip K2 via a resistor R9. According to the low-distortion oscillating system based on band-pass filtering, two LM741 processing chips are cascaded, so that the filtering sensitivity of the oscillating system is greatly improved and the LM741 processing chips have low cost.
Description
Technical field
The present invention relates to a kind of system, specifically refer to the low distortion oscillatory system based on bandpass filtering.
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.
Current oscilator system is provided with and allows the ripple of special frequency channel to pass through, and shields the filter circuit of other frequency ranges simultaneously.But its filter circuit sensitivity is low, this provides for improved the distortion factor of oscillatory system.
Summary of the invention
The object of the invention is to solve the low defect of current oscillatory system filtering sensitivity, the low distortion oscillatory system based on bandpass filtering that a kind of filtering is highly sensitive is provided.
Object of the present invention is by following technical proposals reality: based on the low distortion oscillatory system of bandpass filtering, primarily of signal conversion circuit, the signal amplification circuit be connected with signal conversion circuit, and buffer circuit composition, between signal amplification circuit and buffer circuit, be also provided with bandwidth-limited circuit, described bandwidth-limited circuit is by process chip K2, process chip K3, one end is connected with the OUT pin of process chip K2, the electric capacity C4 that the other end is connected with the IN2 pin of process chip K3 after potentiometer R7 through resistance R8, one end is connected with the IN1 pin of process chip K2, the electric capacity C5 that the other end is then connected with signal amplification circuit, one end is connected with the IN1 pin of process chip K2, the resistance R10 that the other end is connected with the OUT pin of process chip K2, one end is connected with the IN2 pin of process chip K3, the electric capacity C3 that the other end is connected with the IN2 pin of process chip K2 after resistance R9, one end is connected with OUT pin with the V+ pin of process chip K3 simultaneously, the electric capacity C6 that the other end is connected with the IN2 pin of process chip K3 after potentiometer R11 through resistance R12, and one end is connected with the IN1 pin of process chip K3, the electric capacity C7 that the other end is then connected with the OUT pin of process chip K2 forms, the V+ pin of described process chip K2 is connected with external power source, V-pin ground connection, and the IN2 pin of process chip K3 is connected with signal amplification circuit, its V-pin ground connection, OUT pin are then connected with buffer circuit, the tie point ground connection of resistance R9 and electric capacity C3.
Further, 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 K, emitter is connected with the OSC2 pin of conversion chip K after resistance R1, the triode VT1 that base stage is then connected with the OSC2 pin of conversion chip K 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 K 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.
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 electric capacity C5, and the inverting input of amplifier P2 is connected with the OUT2 pin of conversion chip K1, its output is then connected with the IN2 pin of process chip K3.
Described buffer circuit is by transformer T2, dual-gate field-effect pipe Q2, positive pole is connected with a grid of dual-gate field-effect pipe Q2, the electric capacity C8 of minus earth, the resistance R15 be in parallel with electric capacity C8, one end is connected with the positive pole of electric capacity C8, the resistance R14 that the other end is connected with the Same Name of Ends on the former limit of transformer T2 after resistance R13, one end is connected with the b grid of dual-gate field-effect pipe Q2, the resistance R16 that the other end is connected with the source electrode of dual-gate field-effect pipe Q2 after electric capacity C9, and one end is connected with the source electrode of dual-gate field-effect pipe Q2, the resistance R17 that the other end is connected with the tie point of electric capacity C9 with resistance R16 forms, the b grid of described dual-gate field-effect pipe Q2 is also connected with the OUT pin of process chip K3, 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, the tie point ground connection of resistance R16 and electric capacity C9.
Described process chip K2 and process chip K3 all adopts LM741 process chip.
The present invention compared with prior art has the following advantages and beneficial effect:
1, the present invention compared with prior art have employed the structure of two LM741 process chip phases cascade, thus substantially increases the filtering sensitivity of oscillatory system, and LM741 process chip is cheap.
2, 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.
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 low distortion oscillatory system based on bandpass filtering of the present invention, primarily of signal conversion circuit, the signal amplification circuit be connected with signal conversion circuit, and buffer circuit composition.In order to realize this bright object, between signal amplification circuit and buffer circuit, be also provided with bandwidth-limited circuit.
Bandwidth-limited circuit is emphasis of the present invention, its concrete structure by process chip K2, process chip K3, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, resistance R8, resistance R9, resistance R10, resistance R12, potentiometer R7, and potentiometer R11 forms.Connected mode is, one end of electric capacity C4 is connected with the OUT pin of process chip K2, the other end is connected with the IN2 pin of process chip K3 after potentiometer R7 through resistance R8, one end of electric capacity C5 is connected with the IN1 pin of process chip K2, the other end is then connected with signal amplification circuit, one end of resistance R10 is connected with the IN1 pin of process chip K2, the other end is connected with the OUT pin of process chip K2, one end of electric capacity C3 is connected with the IN2 pin of process chip K3, the other end is connected with the IN2 pin of process chip K2 after resistance R9, one end of electric capacity C6 is connected with OUT pin with the V+ pin of process chip K3 simultaneously, the other end is connected with the IN2 pin of process chip K3 after potentiometer R11 through resistance R12, one end of electric capacity C7 is connected with the IN1 pin of process chip K3, the other end is then connected with the OUT pin of process chip K2.Meanwhile, the V+ pin of process chip K2 is connected with external power source, V-pin ground connection, and the IN2 pin of process chip K3 is connected with signal amplification circuit, its V-pin ground connection, OUT pin are then connected with buffer circuit, the tie point ground connection of resistance R9 and electric capacity C3.In order to better realize the present invention, this process chip K2 and process chip K3 all uses LM741 chip.
This bandwidth-limited circuit is formed by the cascade of two LM741 process chip, 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.
Wherein, 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 K, emitter is connected with the OSC2 pin of conversion chip K after resistance R1, the triode VT1 that base stage is then connected with the OSC2 pin of conversion chip K 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 K 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 then signal input.Signaling 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, and it 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.This signal amplification circuit is by amplifier P1, and amplifier P2, resistance R6, resistance R5, resistance R4, resistance R3 form.During connection, between the inverting input that resistance R6 is serially connected with amplifier P1 and output, one end of resistance R5 is connected with the normal phase input end of amplifier P1, other end ground connection, between the inverting input that resistance R4 is serially connected with amplifier P2 and output, one end of resistance R3 is connected with the normal phase input end of amplifier P2, other end ground connection.Simultaneously, the inverting input of amplifier P1 is connected with the OUT1 pin of conversion chip K1, its output is then connected with electric capacity C5, and the inverting input of amplifier P2 is connected with the OUT2 pin of conversion chip K1, its output is then connected with the IN2 pin of process chip K3.
Simultaneously, buffer circuit is by transformer T2, dual-gate field-effect pipe Q2, positive pole is connected with a grid of dual-gate field-effect pipe Q2, the electric capacity C8 of minus earth, the resistance R15 be in parallel with electric capacity C8, one end is connected with the positive pole of electric capacity C8, the resistance R14 that the other end is connected with the Same Name of Ends on the former limit of transformer T2 after resistance R13, one end is connected with the b grid of dual-gate field-effect pipe Q2, the resistance R16 that the other end is connected with the source electrode of dual-gate field-effect pipe Q2 after electric capacity C9, and one end is connected with the source electrode of dual-gate field-effect pipe Q2, the resistance R17 that the other end is connected with the tie point of electric capacity C9 with resistance R16 forms, the b grid of described dual-gate field-effect pipe Q2 is also connected with the OUT pin of process chip K3, 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 signal output, the tie point ground connection of resistance R16 and electric capacity C9.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.
As mentioned above, just well the present invention can be realized.
Claims (5)
1. based on the low distortion oscillatory system of bandpass filtering, primarily of signal conversion circuit, the signal amplification circuit be connected with signal conversion circuit, and buffer circuit composition, is characterized in that: between signal amplification circuit and buffer circuit, be also provided with bandwidth-limited circuit, described bandwidth-limited circuit is by process chip K2, process chip K3, one end is connected with the OUT pin of process chip K2, the electric capacity C4 that the other end is connected with the IN2 pin of process chip K3 after potentiometer R7 through resistance R8, one end is connected with the IN1 pin of process chip K2, the electric capacity C5 that the other end is then connected with signal amplification circuit, one end is connected with the IN1 pin of process chip K2, the resistance R10 that the other end is connected with the OUT pin of process chip K2, one end is connected with the IN2 pin of process chip K3, the electric capacity C3 that the other end is connected with the IN2 pin of process chip K2 after resistance R9, one end is connected with OUT pin with the V+ pin of process chip K3 simultaneously, the electric capacity C6 that the other end is connected with the IN2 pin of process chip K3 after potentiometer R11 through resistance R12, and one end is connected with the IN1 pin of process chip K3, the electric capacity C7 that the other end is then connected with the OUT pin of process chip K2 forms, the V+ pin of described process chip K2 is connected with external power source, V-pin ground connection, and the IN2 pin of process chip K3 is connected with signal amplification circuit, its V-pin ground connection, OUT pin are then connected with buffer circuit, the tie point ground connection of resistance R9 and electric capacity C3.
2. the low distortion oscillatory system based on bandpass filtering according to claim 1, 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 K, emitter is connected with the OSC2 pin of conversion chip K after resistance R1, the triode VT1 that base stage is then connected with the OSC2 pin of conversion chip K 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 K 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.
3. the low distortion oscillatory system based on bandpass filtering according to claim 2, 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 electric capacity C5, and the inverting input of amplifier P2 is connected with the OUT2 pin of conversion chip K1, its output is then connected with the IN2 pin of process chip K3.
4. the low distortion oscillatory system based on bandpass filtering according to claim 3, it is characterized in that: described buffer circuit is by transformer T2, dual-gate field-effect pipe Q2, positive pole is connected with a grid of dual-gate field-effect pipe Q2, the electric capacity C8 of minus earth, the resistance R15 be in parallel with electric capacity C8, one end is connected with the positive pole of electric capacity C8, the resistance R14 that the other end is connected with the Same Name of Ends on the former limit of transformer T2 after resistance R13, one end is connected with the b grid of dual-gate field-effect pipe Q2, the resistance R16 that the other end is connected with the source electrode of dual-gate field-effect pipe Q2 after electric capacity C9, and one end is connected with the source electrode of dual-gate field-effect pipe Q2, the resistance R17 that the other end is connected with the tie point of electric capacity C9 with resistance R16 forms, the b grid of described dual-gate field-effect pipe Q2 is also connected with the OUT pin of process chip K3, 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, the tie point ground connection of resistance R16 and electric capacity C9.
5. the low distortion oscillatory system based on bandpass filtering according to claim 4, is characterized in that: described process chip K2 and process chip K3 all adopts LM741 process chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410662467.2A CN104393839A (en) | 2014-11-18 | 2014-11-18 | Low-distortion oscillating system based on band-pass filtering |
| CN201510309506.5A CN104953950A (en) | 2014-11-18 | 2015-06-08 | Low-distortion oscillating system based on band-pass filtering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410662467.2A CN104393839A (en) | 2014-11-18 | 2014-11-18 | Low-distortion oscillating system based on band-pass filtering |
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| Publication Number | Publication Date |
|---|---|
| CN104393839A true CN104393839A (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410662467.2A Pending CN104393839A (en) | 2014-11-18 | 2014-11-18 | Low-distortion oscillating system based on band-pass filtering |
| CN201510309506.5A Withdrawn CN104953950A (en) | 2014-11-18 | 2015-06-08 | Low-distortion oscillating system based on band-pass filtering |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510309506.5A Withdrawn CN104953950A (en) | 2014-11-18 | 2015-06-08 | Low-distortion oscillating system based on band-pass filtering |
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| Country | Link |
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| CN (2) | CN104393839A (en) |
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2014
- 2014-11-18 CN CN201410662467.2A patent/CN104393839A/en active Pending
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- 2015-06-08 CN CN201510309506.5A patent/CN104953950A/en not_active Withdrawn
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| CN104953950A (en) | 2015-09-30 |
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Application publication date: 20150304 |