CN103973271A - Signal generation circuit - Google Patents
Signal generation circuit Download PDFInfo
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- CN103973271A CN103973271A CN201410172120.XA CN201410172120A CN103973271A CN 103973271 A CN103973271 A CN 103973271A CN 201410172120 A CN201410172120 A CN 201410172120A CN 103973271 A CN103973271 A CN 103973271A
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Abstract
The invention discloses a signal generation circuit. An operational amplifier and a discrete device are combined to form a square wave-triangular wave generation circuit, and triangular waves are obtained by square waves output by a hysteresis comparator through a comparator. A conversion circuit from the triangular waves to sine waves is mainly completed through a diode and a resistance voltage division circuit. According to the design principle of the conversion circuit, nonlinearity of a transmission characteristic curve of the diode is utilized. Compared with the prior art, the waveform distortion meets the index requirement, the frequency coverage range is large, the frequency is adjustable, output signals are stable and reliable, and the cost of the circuit is low.
Description
Technical field
The present invention relates to basic electronic circuit technical field, particularly a kind of signal generating circuit.
Background technology
The frame diagram of common Waveform generating circuit design is all according to shown in Fig. 1, Waveform generating circuit is used for producing three kinds of signals such as square wave, triangular wave, sine wave, conventional method generally has three kinds: the first is to produce square wave, then obtains triangular wave and sine wave through conversion; The second is first to produce sine wave to obtain square wave and triangular wave again; The third is first to produce triangular wave to be transformed to square wave and sine wave again.
In existing Waveform generating circuit, technical problem underlying has: 1, waveform distortion is high, can not reach technical requirement; 2, frequency coverage cannot meet the demands; 3, amplitude output signal can be decayed; 4, circuit cost is higher.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of signal generating circuit is provided.The present invention is achieved through the following technical solutions:
A kind of signal generating circuit, comprising:
Oscillating circuit, in order to produce square wave and triangular wave, comprise a hysteresis comparator and an integrator, the output of hysteresis comparator connects the inverting input of integrator, the output of integrator connects the normal phase input end of hysteresis comparator, integrator converts the square wave of hysteresis comparator output to triangular wave, feeds back to the normal phase input end of hysteresis comparator simultaneously, makes hysteresis comparator produce the square wave overturning with the variation of triangular wave; Wherein, between the output of hysteresis comparator and the inverting input of integrator, be connected with one first potentiometer, in order to regulate the frequency of oscillation of oscillating circuit, the output of integrator is by the electric capacity of two parallel connections and the inverting input of diverter switch connection integrator, diverter switch is in order to one in the electric capacity of switched conductive two parallel connections, thus the working frequency range of control frequency of oscillation;
Sine wave shaping circuit, the output of connection integrator, in order to the triangular wave of oscillating circuit output is converted to sine wave, comprises a voltage follower, and positive half wave translation circuit and/or negative half-wave translation circuit; Wherein, positive half wave translation circuit comprises: one first resistor voltage divider circuit of the resistance composition of some series connection, one end connects a positive voltage and one second potentiometer, other end ground connection, the output of integrator is connected to by the diode of some parallel connections between the resistance of every two series connection of the first resistor voltage divider circuit; Negative half-wave translation circuit comprises: one second resistor voltage divider circuit of the resistance composition of some series connection, one end connects a negative voltage and one the 3rd potentiometer, other end ground connection, the output of integrator is connected to by the diode of some parallel connections between the resistance of every two series connection of the second resistor voltage divider circuit; Voltage follower comprises an operational amplifier, the normal phase input end of operational amplifier is by a resistance and diodes in parallel some in parallel in positive half wave translation circuit and/or negative half-wave translation circuit, the output of operational amplifier is connected with inverting input, output sine wave output, triangular wave or the square-wave signal of operational amplifier.
Preferably, the positive pole of the diode of the some parallel connections in positive half wave translation circuit connects the output of integrator, and the negative pole of the diode of some parallel connections is connected between the resistance of every two series connection of the first resistor voltage divider circuit.
Preferably, the negative pole of the diode of the some parallel connections in negative half-wave translation circuit connects the output of integrator, and the positive pole of the diode of some parallel connections is connected between the resistance of every two series connection of the first resistor voltage divider circuit.
Preferably, also comprise an output circuit, output circuit comprises:
One waveform selector switch, output, the output of integrator and the output of operational amplifier of connection hysteresis comparator, in order to select output waveform;
One second operational amplifier, the normal phase input end of the second operational amplifier is connected waveform selector switch with inverting input, in order to output waveform is amplified;
Two triodes in parallel, the base stage of two triodes in parallel is connected the output of the second operational amplifier with collector electrode, the collector electrode of two triodes in parallel connects respectively a positive voltage and a negative voltage, common inverting input the output waveform of common output after amplifying that connects the second operational amplifier of emitter of two triodes in parallel.
Preferably, between the normal phase input end of the second operational amplifier and inverting input and waveform selector switch, be connected respectively a potentiometer, in order to output waveform is carried out to amplitude adjustment.
Signal generating circuit provided by the present invention is compared to prior art, and not only waveform distortion meets index request, and frequency coverage is large, frequency is adjustable, and stable output signal is reliable and circuit cost is cheap.
Brief description of the drawings
Shown in Fig. 1 is the frame diagram of Waveform generating circuit design;
Shown in Fig. 2 is the circuit diagram of oscillating circuit of the present invention;
Shown in Fig. 3 is the oscillogram of oscillating circuit of the present invention;
Shown in Fig. 4 is the circuit diagram of Sine wave shaping circuit of the present invention;
Shown in Fig. 5 is the circuit diagram of the Sine wave shaping circuit of positive half wave of the present invention;
Shown in Fig. 6 is the circuit diagram of Waveform generating circuit of the present invention.
Embodiment
Below with reference to accompanying drawing of the present invention; technical scheme in the embodiment of the present invention is carried out to clear, complete description and discussion; obviously; as described herein is only a part of example of the present invention; it is not whole examples; based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to protection scope of the present invention.
For the ease of the understanding to the embodiment of the present invention, be further explained as an example of specific embodiment example below in conjunction with accompanying drawing, and each embodiment does not form the restriction to the embodiment of the present invention.
A kind of Waveform generating circuit provided by the invention comprises: oscillating circuit, Sine wave shaping circuit and output circuit.
Oscillating circuit comprises a hysteresis comparator 21 and an integrator 22, and square wave converts triangular wave to and can realize by hysteresis comparator and inverting integrator.The square wave that integrator 22 is exported hysteresis comparator 21 converts triangular wave to, feeds back to the in-phase input end of hysteresis comparator 21 simultaneously, makes comparator produce the square wave overturning with the variation of triangular wave, and the waveform of generation as shown in Figure 3.
Between the inverting input of the output of hysteresis comparator 21 and integrator 22, be connected with one first potentiometer RP1, in order to regulate the frequency of oscillation of oscillating circuit, the output of integrator 22 switches with C2 and an inverting input that switch S is connected integrator 22 by the capacitor C 1 of two parallel connections, diverter switch S is in order to one in the electric capacity of switched conductive two parallel connections, thus the working frequency range of control frequency of oscillation.
As shown in Figure 2, form Schmidt's voltage comparator circuit by IC1A, R1, R2, R3.According to the characteristic of Schmidt's voltage comparator circuit, in the time of threshold voltage U1 that input voltage rises to set, circuit output end will be high level by low level upset, in the time that input voltage drops to another threshold voltage U2, circuit output end is low level by high level upset, waveform as shown in Figure 3, can be released: Ui=-U0(R3/R2).In formula, Ui is the overturn input in moment of Schmidt, i.e. the output of IC1B; Uo is the output of IC1A.
Threshold voltage U1, U2 are determined by R2, R3 and U0.In the time of IC1A output high level, Uo is+10V left and right that, in the time of IC1A output low level, Uo is-10V left and right.Ui is input voltage threshold value, and in the time that Uo is high level, Ui is U1.(threshold voltage: Ui=-Uo (R3/R2)=-10 × 3.6/5.1 ≈-7V)
RP1, R6, R7, C1, IC1B form integrating circuit, the output of its input termination IC1A, and in the time of the output high level of IC1A (+10V left and right), IC1B is to lower integral, and the voltage linear of output declines; In the time of the low level of IC1A output (10V left and right), IC1B is to upper integral, and the voltage linear of output rises.
The surge frequency range of counting circuit, can only be between 350-7000H.If realize 100-10000Hz scope, need in two frequency ranges, realize, therefore, the design, adopting two integrating capacitor C1 and C2 in circuit, realizes by a wave band diverter switch.
As shown in Figure 4, Sine wave shaping circuit comprises a voltage follower, and positive half wave translation circuit and/or negative half-wave translation circuit.Utilize existing triangular wave, obtain sine wave by the shaping conversion to triangular waveform.This method is conducive to the synchronous and stable of waveform frequency, good cost performance.The nonlinear characteristic that the present invention utilizes diode to have, after conducting, the resistance of diode diminishes gradually, and the triangular wave of oscillating circuit output, by the control circuit (bleeder circuit principle) being made up of diode and resistance, converts triangular wave to sine wave.
In Fig. 4, Sine wave shaping circuit is made up of resistance R 16-R25, potentiometer RP2, potentiometer RP3, diode V1-V10.Wherein V1, V6 are the first order, and V2, V7 are the second level ..., V5, V10 are bottom, Pyatyi altogether, and R16-R25 and R10, R38, RP2, RP3 dividing potential drop, the breakover point of decision waveform, determines each diode turn-on voltage value; R11, R12, R13, R14, R15 and R19 dividing potential drop, determine degree of crook at different levels.Operational amplifier IC1D and resistance R 26 form voltage follower.Taking positive direction (positive half wave) as example, Sine wave shaping circuit is variable to be changed to shown in Fig. 5.
U1, U2, U3, U4, U5 are respectively the critical conduction voltage of V1, V2, V3, V4, V5, they by RP2, R16, R17, R18, R19, R20 right+10.5V voltage dividing potential drop determines.In the time of input voltage Ui< U1, not conductings of V1-V5, output voltage is similar to input voltage, i.e. output voltage U o ≈ Ui(triangular signal voltage).
In the time of U1<Ui< U2, diode V5 conducting, all the other still not conductings of diode, V5, R15 branch road are together with R26, Ui is had to dividing potential drop effect, thus Uo≤Ui, and along with the increase gradually of Ui, the resistance of diode V5 reduces gradually, it is large that dividing potential drop effect also becomes gradually, and output voltage (Uo) is more and more less than input voltage (Ui), observes waveform, output waveform Uo no longer rises with the same straight line of input waveform Ui, but bending gradually.
Along with the further increase of Ui, all the other diodes also start conducting gradually, and dividing potential drop coefficient further diminishes, and curve is more curved, and when diode is when all conducting reaches top, waveform is the most curved.Diode is always connected with a resistance, and in the time that resistance is large, diode action diminishes, resistance hour, and it is large that diode action becomes, and regulates this resistance sizes, can regulate this grade of degree of crook.The research of offset of sinusoidal ripple is known, and in waveform bottom, curve approaches straight line, and when approaching top, curve is just more and more curved.So the value of resistance at different levels is also more upwards less.
Shown in Fig. 6 is integrated circuit figure of the present invention.The present invention also comprises an output circuit, and output circuit comprises: a waveform selector switch S2, and output, the output of integrator and the output of operational amplifier IC1D of connection hysteresis comparator, in order to select output waveform; One second operational amplifier IC1C, the normal phase input end of the second operational amplifier IC1C is connected waveform selector switch S2 with inverting input, in order to output waveform is amplified; Two triodes in parallel, the base stage of two triodes in parallel is connected the output of the second operational amplifier with collector electrode, the collector electrode of two triodes in parallel connects respectively a positive voltage and a negative voltage, common inverting input the output waveform of common output after amplifying that connects the second operational amplifier of emitter of two triodes in parallel.Between the normal phase input end of the second operational amplifier and inverting input and waveform selector switch, be connected respectively potentiometer W1 and a W2, in order to output waveform is carried out to amplitude adjustment.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (5)
1. a signal generating circuit, is characterized in that, comprising:
Oscillating circuit, in order to produce square wave and triangular wave, comprise a hysteresis comparator and an integrator, the output of described hysteresis comparator connects the inverting input of described integrator, the output of described integrator connects the normal phase input end of described hysteresis comparator, described integrator converts the square wave of described hysteresis comparator output to triangular wave, feeds back to the normal phase input end of described hysteresis comparator simultaneously, makes described hysteresis comparator produce the square wave overturning with the variation of triangular wave; Wherein, between the output of described hysteresis comparator and the inverting input of described integrator, be connected with one first potentiometer, in order to regulate the frequency of oscillation of described oscillating circuit, the electric capacity of the output of described integrator by two parallel connections and a diverter switch connect the inverting input of described integrator, described diverter switch is in order to one in the electric capacity of two parallel connections described in switched conductive, thus the working frequency range of control frequency of oscillation;
Sine wave shaping circuit, connects the output of described integrator, in order to the triangular wave of described oscillating circuit output is converted to sine wave, comprises a voltage follower, and positive half wave translation circuit and/or negative half-wave translation circuit; Wherein, described positive half wave translation circuit comprises: one first resistor voltage divider circuit of the resistance composition of some series connection, one end connects a positive voltage and one second potentiometer, other end ground connection, the output of described integrator is connected to by the diode of some parallel connections between the resistance of every two described series connection of described the first resistor voltage divider circuit; Described negative half-wave translation circuit comprises: one second resistor voltage divider circuit of the resistance composition of some series connection, one end connects a negative voltage and one the 3rd potentiometer, other end ground connection, the output of described integrator is connected to by the diode of some parallel connections between the resistance of every two described series connection of described the second resistor voltage divider circuit; Described voltage follower comprises an operational amplifier, the normal phase input end of described operational amplifier is by a resistance and described some diodes in parallels in parallel in described positive half wave translation circuit and/or described negative half-wave translation circuit, the output of described operational amplifier is connected with inverting input, output sine wave output, triangular wave or the square-wave signal of described operational amplifier.
2. signal generating circuit according to claim 1, it is characterized in that, the positive pole of the diode of the described some parallel connections in described positive half wave translation circuit connects the output of described integrator, and the negative pole of the diode of described some parallel connections is connected between the resistance of every two described series connection of described the first resistor voltage divider circuit.
3. signal generating circuit according to claim 1, it is characterized in that, the negative pole of the diode of the described some parallel connections in described negative half-wave translation circuit connects the output of described integrator, and the positive pole of the diode of described some parallel connections is connected between the resistance of every two described series connection of described the first resistor voltage divider circuit.
4. signal generating circuit according to claim 1, is characterized in that, also comprises an output circuit, and described output circuit comprises:
One waveform selector switch, connects the output of the output of described hysteresis comparator, described integrator and the output of described operational amplifier, in order to select output waveform;
One second operational amplifier, the normal phase input end of described the second operational amplifier is connected described waveform selector switch with inverting input, in order to described output waveform is amplified;
Two triodes in parallel, the base stage of described two triodes in parallel is connected the output of described the second operational amplifier with collector electrode, the collector electrode of described two triodes in parallel connects respectively a positive voltage and a negative voltage, common inverting input the described output waveform of common output after amplifying that connects described the second operational amplifier of emitter of described two triodes in parallel.
5. signal generating circuit according to claim 4, is characterized in that, is connected respectively a potentiometer, in order to described output waveform is carried out to amplitude adjustment between the normal phase input end of described the second operational amplifier and inverting input and described waveform selector switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410172120.XA CN103973271A (en) | 2014-04-28 | 2014-04-28 | Signal generation circuit |
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| CN201410172120.XA CN103973271A (en) | 2014-04-28 | 2014-04-28 | Signal generation circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116182A (en) * | 2015-08-13 | 2015-12-02 | 广州益业机电设备科技有限公司 | Sine wave generating circuit and method for measuring resistance and battery tester |
| CN105407435A (en) * | 2015-11-26 | 2016-03-16 | 宁波柏人艾电子有限公司 | Audio adjusting circuit |
| CN106788438A (en) * | 2017-03-14 | 2017-05-31 | 佛山科学技术学院 | A kind of voltage is to time converting circuit |
| CN107026636A (en) * | 2017-04-19 | 2017-08-08 | 成都市宏山科技有限公司 | The Waveform generating circuit of function signal generator |
| CN108227563A (en) * | 2017-12-13 | 2018-06-29 | 苏州长风航空电子有限公司 | A kind of method that pwm signal is generated by oscillation |
| CN111007377A (en) * | 2019-12-23 | 2020-04-14 | 广东宝星新能科技有限公司 | Temperature sampling circuit, temperature sampling system and UPS system of IGBT module |
| CN111681618A (en) * | 2020-06-28 | 2020-09-18 | 上海天马微电子有限公司 | Light-emitting component and light-emitting module |
| CN112929008A (en) * | 2021-01-25 | 2021-06-08 | 思特尔智能检测系统(苏州)有限公司 | Method and system for generating waveform signal with specified amplitude |
| CN117723812A (en) * | 2024-02-07 | 2024-03-19 | 中国铁塔股份有限公司 | Voltage isolation sampling circuit |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116182A (en) * | 2015-08-13 | 2015-12-02 | 广州益业机电设备科技有限公司 | Sine wave generating circuit and method for measuring resistance and battery tester |
| CN105116182B (en) * | 2015-08-13 | 2018-07-06 | 广州益业机电设备科技有限公司 | For measuring the sine wave generation circuit of resistance, method and storage battery tester |
| CN105407435A (en) * | 2015-11-26 | 2016-03-16 | 宁波柏人艾电子有限公司 | Audio adjusting circuit |
| CN106788438A (en) * | 2017-03-14 | 2017-05-31 | 佛山科学技术学院 | A kind of voltage is to time converting circuit |
| CN106788438B (en) * | 2017-03-14 | 2023-05-05 | 佛山科学技术学院 | Voltage-to-time conversion circuit |
| CN107026636A (en) * | 2017-04-19 | 2017-08-08 | 成都市宏山科技有限公司 | The Waveform generating circuit of function signal generator |
| CN108227563A (en) * | 2017-12-13 | 2018-06-29 | 苏州长风航空电子有限公司 | A kind of method that pwm signal is generated by oscillation |
| CN111007377A (en) * | 2019-12-23 | 2020-04-14 | 广东宝星新能科技有限公司 | Temperature sampling circuit, temperature sampling system and UPS system of IGBT module |
| CN111681618A (en) * | 2020-06-28 | 2020-09-18 | 上海天马微电子有限公司 | Light-emitting component and light-emitting module |
| CN112929008A (en) * | 2021-01-25 | 2021-06-08 | 思特尔智能检测系统(苏州)有限公司 | Method and system for generating waveform signal with specified amplitude |
| CN117723812A (en) * | 2024-02-07 | 2024-03-19 | 中国铁塔股份有限公司 | Voltage isolation sampling circuit |
| CN117723812B (en) * | 2024-02-07 | 2024-05-14 | 中国铁塔股份有限公司 | Voltage isolation sampling circuit |
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