CN107276539B - Programmable sine wave generating circuit - Google Patents
Programmable sine wave generating circuit Download PDFInfo
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- CN107276539B CN107276539B CN201710615517.5A CN201710615517A CN107276539B CN 107276539 B CN107276539 B CN 107276539B CN 201710615517 A CN201710615517 A CN 201710615517A CN 107276539 B CN107276539 B CN 107276539B
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- 230000010355 oscillation Effects 0.000 claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
- H03B5/24—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being semiconductor device
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21063—Bus, I-O connected to a bus
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a programmable sine wave generating circuit, which comprises a CPU, an oscillation module and a comparator U2, wherein the output end of the oscillation module is input into the CPU after being compared by the comparator, and the CPU is used for comparing the frequency of a measured output sine wave signal with a set frequency value, and adjusting a first variable resistor R1 and a second variable resistor R2 to enable the frequency of the output sine wave signal to continuously trend to a set value. The invention can carry out accurate control on the high-frequency signal generating circuit through the CPU, can output a set signal after the frequency and the amplitude are set at will, can detect the frequency and the amplitude in a closed loop, and can compare with the set value so as to finely adjust the error of the output signal, thereby generating a sine signal with accurate and stable frequency and amplitude.
Description
Technical Field
The invention belongs to the field of signal generators, and particularly relates to a programmable high-stability amplitude-stabilized sine wave generating circuit which can be used for signal amplitude modulation and frequency modulation in the fields of broadcasting, television and communication, industrial automatic control, measuring instruments, high-frequency heating, ultrasonic flaw detection and the like.
Background
In the prior art, the high-frequency signal generating circuit has the advantages that the signal generating chip is directly controlled to generate signals, but the circuit has low frequency band and cannot control the amplitude; the frequency mixing principle is also used for generating high-frequency signals, but a large number of harmonic waves exist in the signals after frequency mixing, so that great difficulty is brought to the subsequent filtering treatment; the oscillating circuit is also used for generating high-frequency signals, but the circuit can only generate a signal with fixed frequency and amplitude, the frequency and the amplitude cannot be controlled, the frequency and the amplitude can be adjusted only manually, and the stability of the frequency and the amplitude of the signal cannot be improved.
Disclosure of Invention
The invention aims to: in order to solve the problems existing in the prior art and solve the problem that the frequency and the amplitude in a high-frequency signal generating circuit are difficult to accurately control, and simultaneously, in order to solve the problem that one circuit in the prior art can only generate one signal with fixed frequency and amplitude, the invention provides a programmable control sine wave generating circuit.
The technical scheme is as follows: the invention provides a programmable sine wave generating circuit, which comprises a CPU, an oscillation module and a comparator U2, wherein the oscillation module comprises a first operational amplifier U1, a first variable resistor R1, a second variable resistor R2, a third resistor R3, a feedback resistor Rf, a first capacitor C1 and a second capacitor C2, the first variable resistor R1, the second variable resistor R2, the first capacitor C1 and the second capacitor C2 form a series-parallel frequency selection network, the input end of the series-parallel frequency selection network is connected with the positive input end of the first operational amplifier U1, and the output end is connected with the output end of the first operational amplifier U1; one end of the feedback resistor Rf is connected with the output end of the first operational amplifier U1, and the other end of the feedback resistor Rf is connected with the reverse input end of the first operational amplifier U1; one end of the third resistor R3 is connected with the reverse input end of the first operational amplifier U1, and the other end of the third resistor R is grounded; the output end of the first operational amplifier U1 outputs a sine wave signal, the sine wave signal is input to the homodromous input end of the comparator U2, the reverse input end of the comparator U2 is connected with a comparison voltage, and the output end of the comparator U2 is connected with a Count pin of the CPU; the P1 pin of the CPU is connected with the control ports of the first variable resistor R1 and the second variable resistor R2. The oscillating circuit adopts a variable resistor, and the circuit adjusts the two variable resistance values through negative feedback by utilizing a CPU, so that the frequency of the output sine wave signal can be more accurate.
Further, the amplitude control module comprises a program control operational amplifier chip U4 and a second operational amplifier U5, the output end of the first operational amplifier U1 is connected to the VINP pin of the program control operational amplifier chip U4, the output pin of the program control operational amplifier chip U4 is connected with the homodromous input end of the second operational amplifier U5, the reverse input end and the output end of the second operational amplifier U5 are connected to the A/D pin of the CPU, and the D/A pin of the CPU is connected with the GPOS pin of the program control operational amplifier chip U4. The circuit uses negative feedback to finely adjust the program-controlled operational amplifier chip U4 by using the CPU, so that the amplitude of the output sine wave signal can be more accurate.
Further, the sine wave signal output by the first operational amplifier U1 is connected to the same-direction input end of the comparator U2 after the amplitude value is controlled by the program-controlled operational amplifier chip U4. The two negative feedback links are used simultaneously, so that the frequency accuracy of the output signal is improved, the amplitude accuracy is also improved, and the output sine wave signal is consistent with the set sine wave signal.
Further, the device also comprises an amplitude stabilizing module, wherein the amplitude stabilizing module comprises a first zener diode V1, a second zener diode V2, a third zener diode V3, a fourth zener diode V4 and a fifth zener diode V5, and the anodes of the first zener diode V1 and the second zener diode V2 are connected to one end of a feedback resistor Rf; the cathodes of the first zener diode V1 and the second zener diode V2 are respectively connected with the cathodes of the fourth zener diode V4 and the fifth zener diode V5; the anodes of the fourth zener diode V4 and the fifth zener diode V5 are connected to the other end of the feedback resistor Rf; one end of the third zener diode V3 is connected to the junction of the first zener diode V1 and the fourth zener diode V4, and the other end is connected to the junction of the second zener diode V2 and the fifth zener diode V5. The five voltage stabilizing diodes form an amplitude stabilizing module, so that the amplitude of the sine wave signal output from the first operational amplifier U1 is more stable, and the subsequent stage of program control operational amplifier is convenient to process.
Further, pins P1.0, P1.1 and P1.2 of the CPU are respectively connected with a ADDR, SDA, SCL pin of the variable resistor R1; and pins P1.3, P1.4 and P1.5 of the CPU are respectively connected with a SCL, SDA, ADDR pin of the variable resistor R2.
Further, the inverting input end of the comparator U2 is connected with a resistor R4 and a resistor R5 in series, and a 5V direct current voltage is connected between the resistor R4 and the resistor R5.
Furthermore, the reverse input end of the second operational amplifier U5 is connected to the output end, the same-direction input end is connected with the output pin of the program-controlled operational amplifier chip U4, a resistor R7 is also connected, and the other end of the resistor R7 is connected with 3.3V direct-current voltage.
Further, the CPU is configured to adjust the adjustable resistor R1, the adjustable resistor R2, and the programmable op-amp chip U4.
The beneficial effects are that: the programmable sine wave generating circuit solves the problem that the frequency and the amplitude in the high-frequency signal generating circuit in the prior art are difficult to control accurately, can output a set signal after the frequency and the amplitude are set arbitrarily by a CPU, can detect the frequency and the amplitude in a closed loop, and can compare with a set value to finely adjust the error of the output signal, thereby generating a sine signal with accurate and stable frequency and amplitude; the frequency can be set at will in a wider frequency band range, so that the same circuit can set different frequencies in the frequency band range according to the needs, and the application range is wider and more convenient.
Drawings
Fig. 1 is a schematic diagram of a programmable sine wave generator circuit of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
As shown in fig. 1, the programmable sine wave generating circuit comprises a CPU, an oscillation module, a comparator U2 and an amplitude control module, wherein the oscillation module comprises a first operational amplifier U1, a first variable resistor R1, a second variable resistor R2, a third resistor R3, a feedback resistor Rf, a first capacitor C1 and a second capacitor C2, the first variable resistor R1, the second variable resistor R2, the first capacitor C1 and the second capacitor C2 form a series-parallel frequency-selecting network, the input end of the series-parallel frequency-selecting network is connected with the positive input end of the first operational amplifier U1, and the output end is connected with the output end of the first operational amplifier U1; one end of the feedback resistor Rf is connected with the output end of the first operational amplifier U1, and the other end of the feedback resistor Rf is connected with the reverse input end of the first operational amplifier U1; one end of the third resistor R3 is connected with the reverse input end of the first operational amplifier U1, and the other end of the third resistor R is grounded. The amplitude control module comprises a program control operational amplifier chip U4 and a second operational amplifier U5, wherein the output end of the first operational amplifier U1 is connected to a VINP pin of the program control operational amplifier chip U4, the output pin VOUT of the program control operational amplifier chip U4 is connected with the same-direction input end of a comparator U2, the reverse input end of the comparator U2 is connected with a resistor R4 and a resistor R5 in series, and a 5V direct-current voltage is connected between the resistor R4 and the resistor R5 to provide comparison voltage for the comparator U2. The output end of the comparator U2 is connected with the Count pin of the CPU; the P1 pin of the CPU is connected with the control ports of the first variable resistor R1 and the second variable resistor R2, and particularly the P1.0 pin, the P1.1 pin and the P1.2 pin of the CPU are respectively connected with the ADDR, SDA, SCL pin of the variable resistor R1; and pins P1.3, P1.4 and P1.5 of the CPU are respectively connected with a SCL, SDA, ADDR pin of the variable resistor R2. The closed loop part is regulated by negative feedback, the output sine wave signal is input to the CPU after being compared by the comparator, and the CPU adjusts the first variable resistor R1 and the second variable resistor R2 by comparing the measured frequency of the output sine wave signal with a set frequency value, so that the frequency of the output sine wave signal continuously tends to the set value.
The output pin VOUT of the program-controlled operational amplifier chip U4 is simultaneously connected with the homodromous input end of the second operational amplifier U5, the reverse input end and the output end of the second operational amplifier U5 are both connected to the A/D pin of the CPU, and the D/A pin of the CPU is connected with the GPOS pin of the program-controlled operational amplifier chip U4. The same-direction input end of the second operational amplifier U5 is connected with an output pin of the program-controlled operational amplifier chip U4, and is also connected with a resistor R7, and the other end of the resistor R7 is connected with 3.3V direct-current voltage. The closed loop part is added with a negative feedback link for controlling the amplitude, the amplitude of the output sine wave signal is regulated by using the program-controlled operational amplifier chip U4, the output signal is transmitted to the CPU after being subjected to level conversion by the second operational amplifier U5, and the CPU compares the measured signal amplitude with the set amplitude, and the program-controlled operational amplifier chip U4 is finely adjusted so that the amplitude of the output signal is identical to the set amplitude.
In this embodiment, the sine wave signal output by the first operational amplifier U1 is connected to the comparator U2 and the second operational amplifier U5 after the amplitude of the sine wave signal is controlled by the programmable operational amplifier chip U4. The two negative feedback links are used simultaneously, so that the frequency accuracy of the output signal is improved, the amplitude accuracy is also improved, and the output sine wave signal is consistent with the set sine wave signal.
The amplitude stabilizing module comprises a first zener diode V1, a second zener diode V2, a third zener diode V3, a fourth zener diode V4 and a fifth zener diode V5, and the anodes of the first zener diode V1 and the second zener diode V2 are connected to one end of a feedback resistor Rf; the cathodes of the first zener diode V1 and the second zener diode V2 are respectively connected with the cathodes of the fourth zener diode V4 and the fifth zener diode V5; the anodes of the fourth zener diode V4 and the fifth zener diode V5 are connected to the other end of the feedback resistor Rf; one end of the third zener diode V3 is connected to the junction of the first zener diode V1 and the fourth zener diode V4, and the other end is connected to the junction of the second zener diode V2 and the fifth zener diode V5. The five voltage stabilizing diodes form an amplitude stabilizing module, so that the amplitude of the sine wave signal output from the first operational amplifier U1 is more stable, and the subsequent stage of program control operational amplifier is convenient to process.
The circuit has a positive feedback network and a negative feedback network, outputs sine wave frequency f=1/2 pi RC, can adjust the resistance values of the resistors R1 and R2 through a CPU, achieves the purpose of changing output frequency, and has the adjustable frequency range: 1Hz-10MHz; . The program-controlled operational amplifier AD603 can be regulated by the CPU, so that the purpose of changing the output amplitude is achieved. The CPU system forms frequency and amplitude double closed-loop control, and finally, a sine wave signal with adjustable frequency and amplitude and very stable amplitude can be obtained.
Pin description of key devices in the circuit of this embodiment:
CPU: the pins P1.0-P1.5 are I/O ports, and I is formed between the variable resistor and the I/O port 2 A C bus, which is communicated with the incoming line and controls the resistance value of the variable resistor;
the D/A pin is used for outputting analog signals and controlling the amplification factor of the program-controlled operational amplifier AD 603;
the A/D pin is used for sampling an analog signal and judging whether an output signal of the AD603 is consistent with a preset amplitude value or not;
the Count pin is a timing/counting port of the CPU, judges whether the frequency of the sine wave signal is consistent with the preset frequency, measures the sine wave frequency output by the oscillating circuit, counts the sine wave frequency by measuring the period of square waves output by the comparator when the frequency is lower, and calculates the sine wave frequency by measuring the number of square waves output by the comparator, namely a counting method when the frequency is higher.
Adjustable resistance R1/R2: the model of the adjustable resistor is AD5272, 10-bit D/A conversion is adopted in the embodiment, and the resolution is 0.098%; SCL/SDA/ADDR pins and CPU constitute I 2 C bus, regulating resistance value; the A/W pin is a resistance output pin of the variable resistor.
Program control operational amplifier chip U4: the model of the program-controlled operational amplifier chip adopted in the embodiment is AD603, and two pins of GPOS and GNEG of the AD603 are control voltage input ends for controlling the amplification factor; VINP is the signal input of the program controlled op-amp; COMM is signal ground; VPOS and VNEG are power supply input ends of the program-controlled operational amplifier; FDBK is a feedback loop in the program-controlled operational amplifier, and can adjust the amplification factor; VOUT is the signal output.
The first operational amplifier U1 and the second operational amplifier U5 adopt TL082.
Comparator U2 employs LM339.
The index parameters of the programmable sine wave generation circuit of this embodiment are as follows:
(1) Frequency range
The resistance values of the resistors R1 and R2 are adjusted by the CPU, and RC parameters are further adjusted, so that the set frequency is adjusted, and the frequency adjustable range of the embodiment is as follows: 1Hz-10MHz.
(2) Frequency accuracy
The frequency accuracy is mainly determined by the accuracy value of the variable resistor R, and the accuracy of the output frequency can reach 1 multiplied by 10 through frequency feedback measurement and control -8 。
The calculation formula of the frequency accuracy is: delta= (f 0-f 1)/f1×100%, where f0 is a frequency set point and f1 is an actual frequency value.
(3) Frequency stability
The frequency stability refers to the ratio of the magnitude of the output frequency value change to the reference frequency within 15 mm under the condition that other external conditions are constant.
The calculation formula of the frequency stability:
the signal generating circuit is a frequency feedback control circuit, and the frequency stability can reach 1×10 by final frequency adjustment -8 。
(4) Amplitude stability
The calculation formula of the amplitude stability is:
the oscillating part of the circuit adopts a voltage stabilizing circuit capable of stabilizing positive and negative half shafts of amplitude, the amplitude is controlled by a program controlled chip AD603, the output amplitude is compared with a preset amplitude after A/D sampling, the output amplitude is used for fine tuning the AD603 to enable the output amplitude to be close to the preset amplitude, and the amplitude stability of the circuit can reach 1 multiplied by 10 after a series of processing -6 。
Claims (4)
1. The sine wave generating circuit is characterized by comprising a CPU, an oscillation module and a comparator U2, wherein the oscillation module comprises a first operational amplifier U1, a first variable resistor R1, a second variable resistor R2, a third resistor R3, a feedback resistor Rf, a first capacitor C1 and a second capacitor C2, the first variable resistor R1, the second variable resistor R2, the first capacitor C1 and the second capacitor C2 form a series-parallel frequency selection network, the input end of the series-parallel frequency selection network is connected with the positive input end of the first operational amplifier U1, and the output end of the series-parallel frequency selection network is connected with the output end of the first operational amplifier U1; one end of the feedback resistor Rf is connected with the output end of the first operational amplifier U1, and the other end of the feedback resistor Rf is connected with the reverse input end of the first operational amplifier U1; one end of the third resistor R3 is connected with the reverse input end of the first operational amplifier U1, and the other end of the third resistor R is grounded; the output end of the first operational amplifier U1 outputs a sine wave signal, the sine wave signal is input to the homodromous input end of the comparator U2, the reverse input end of the comparator U2 is connected with a comparison voltage, and the output end of the comparator U2 is connected with a Count pin of the CPU; the P1 pin of the CPU is connected with the control ports of the first variable resistor R1 and the second variable resistor R2;
the programmable sine wave generating circuit further comprises an amplitude control module, the amplitude control module comprises a program-controlled operational amplifier chip U4 and a second operational amplifier U5, the output end of the first operational amplifier U1 is connected to a VINP pin of the program-controlled operational amplifier chip U4, the output pin of the program-controlled operational amplifier chip U4 is connected with the same-directional input end of the second operational amplifier U5, the reverse input end and the output end of the second operational amplifier U5 are both connected to an A/D pin of the CPU, and the D/A pin of the CPU is connected with a GPOS pin of the program-controlled operational amplifier chip U4;
the sine wave signal output by the first operational amplifier U1 is connected to the same-direction input end of the comparator U2 after the amplitude value is controlled by the program-controlled operational amplifier chip U4;
the sine wave generating circuit further comprises an amplitude stabilizing module, wherein the amplitude stabilizing module comprises a first voltage stabilizing diode V1, a second voltage stabilizing diode V2, a third voltage stabilizing diode V3, a fourth voltage stabilizing diode V4 and a fifth voltage stabilizing diode V5, and the positive poles of the first voltage stabilizing diode V1 and the second voltage stabilizing diode V2 are connected to one end of a feedback resistor Rf; the cathodes of the first zener diode V1 and the second zener diode V2 are respectively connected with the cathodes of the fourth zener diode V4 and the fifth zener diode V5; the anodes of the fourth zener diode V4 and the fifth zener diode V5 are connected to the other end of the feedback resistor Rf; one end of the third zener diode V3 is connected to the junction of the first zener diode V1 and the fourth zener diode V4, and the other end is connected to the junction of the second zener diode V2 and the fifth zener diode V5;
the pins P1.0, P1.1 and P1.2 of the CPU are respectively connected with the pin ADDR, SDA, SCL of the variable resistor R1; and pins P1.3, P1.4 and P1.5 of the CPU are respectively connected with a SCL, SDA, ADDR pin of the variable resistor R2.
2. The programmable sine wave generating circuit of claim 1, wherein the inverting input of the comparator U2 is connected in series with a resistor R4 and a resistor R5, and a 5 vdc is connected between the resistor R4 and the resistor R5.
3. The programmable sine wave generating circuit according to claim 1, wherein the reverse input end of the second op-amp U5 is connected to the output end, the same-direction input end is connected to the output pin of the programmable op-amp chip U4, and is further connected to a resistor R7, and the other end of the resistor R7 is connected to a 3.3V dc voltage.
4. The programmable sine wave generation circuit of claim 1, wherein the CPU is configured to adjust the adjustable resistor R1, the adjustable resistor R2, and the programmable op-amp chip U4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710615517.5A CN107276539B (en) | 2017-07-26 | 2017-07-26 | Programmable sine wave generating circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710615517.5A CN107276539B (en) | 2017-07-26 | 2017-07-26 | Programmable sine wave generating circuit |
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| CN107276539A CN107276539A (en) | 2017-10-20 |
| CN107276539B true CN107276539B (en) | 2023-10-13 |
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| CN201710615517.5A Active CN107276539B (en) | 2017-07-26 | 2017-07-26 | Programmable sine wave generating circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI691170B (en) * | 2019-12-30 | 2020-04-11 | 新唐科技股份有限公司 | Wave generator and method for generating waveform |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1805269A (en) * | 2006-01-23 | 2006-07-19 | 艾默生网络能源有限公司 | Sinusoidal reference circuit |
| CN102332864A (en) * | 2011-09-29 | 2012-01-25 | 北京经纬恒润科技有限公司 | Sine wave oscillation circuit |
| CN207117577U (en) * | 2017-07-26 | 2018-03-16 | 江苏大全凯帆电器股份有限公司 | A kind of sine wave generating circuit of PLC technology |
-
2017
- 2017-07-26 CN CN201710615517.5A patent/CN107276539B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1805269A (en) * | 2006-01-23 | 2006-07-19 | 艾默生网络能源有限公司 | Sinusoidal reference circuit |
| CN102332864A (en) * | 2011-09-29 | 2012-01-25 | 北京经纬恒润科技有限公司 | Sine wave oscillation circuit |
| CN207117577U (en) * | 2017-07-26 | 2018-03-16 | 江苏大全凯帆电器股份有限公司 | A kind of sine wave generating circuit of PLC technology |
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| CN107276539A (en) | 2017-10-20 |
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Address after: No. 11 Daquan Road, Yangzhong City, Yangzhou City, Jiangsu Province, 212211 Applicant after: Jiangsu Daqo Kfine Electric Co.,Ltd. Address before: 211100 28 Yin long road, Jiangning District, Nanjing, Jiangsu. Applicant before: Jiangsu Daqo Kaifan Electrical Appliance Co.,Ltd. |