CN213690296U - Digital signal generator based on DDS technology - Google Patents
Digital signal generator based on DDS technology Download PDFInfo
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- CN213690296U CN213690296U CN202023273046.0U CN202023273046U CN213690296U CN 213690296 U CN213690296 U CN 213690296U CN 202023273046 U CN202023273046 U CN 202023273046U CN 213690296 U CN213690296 U CN 213690296U
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Abstract
The utility model discloses a digital signal generator based on DDS technology, belonging to the field of electronic elements, comprising a PCB board, wherein the PCB board is provided with a singlechip and an AD9833 type chip, and the AD9832 type chip comprises a plurality of frequency registers and a phase register; the signal input pin of the singlechip is connected with the ground through a switch, the output end of the singlechip is connected with the input end of an AD9833 type chip, and the output end of the AD9833 type chip is used for being connected with an equipment terminal; the control switch switches on and off an input signal to the singlechip, the singlechip outputs a signal to the AD9833 type chip according to the on-off signal, and the AD9833 type chip switches the frequency register or/and the phase register according to the input signal of the singlechip to change the output waveform of the output end; compared with the prior art, the utility model has the advantages of simple structure, stable, the response speed of output is fast, control is convenient, can directly carry out board and carry signal output adjustment and demonstration, directly know and control system output.
Description
Technical Field
The utility model relates to a digital generator field specifically is a digital signal generator based on DDS technique.
Background
In the development and production process of modern electronic equipment, a signal generator is an important component for testing and generating related excitation signals, and the stability and accuracy of output signals of the signal generator are directly related to the quality and the overall performance of a designed system. A signal generator with high stability and high accuracy becomes necessary.
Currently, there are four main frequency synthesis techniques: direct frequency synthesis (DS), phase-locked loop indirect frequency synthesis (PLL), direct digital frequency synthesis (DDS), and hybrid frequency synthesis; the direct frequency synthesis technology combines single or multiple reference signals through different combinations of frequency mixing, frequency multiplication, frequency division and filtering to realize arithmetic operation, so as to synthesize the required frequency, and has the advantages of high frequency conversion rate, high resolution, low phase noise and high output frequency. However, the structure is complex, and a large number of mixing and frequency doubling modules must be used in the face of multiple splicing points in the system, so that a large number of filters are introduced to suppress intermodulation and harmonic interference, the circuit structure is complicated, and the generation cost is increased. The phase-locked frequency synthesis technology is a method for realizing frequency synthesis based on a feedback control principle, and has the advantages of wide frequency range, good spurious suppression performance, high purity of output frequency spectrum, easy control of output frequency, long frequency conversion time, difficult frequency hopping realization, deteriorated phase noise index of the output frequency spectrum and difficult realization of high frequency resolution if small stepping is realized.
With the continuous development of digital signal theory, direct digital frequency synthesis (DDS) becomes the mainstream of frequency synthesis; a direct digital frequency synthesizer is actually a frequency divider. The system input values are divided by programming internal registers to produce the desired frequency. Since the direct digital frequency synthesizer operates in the digital domain, the number of bits of the frequency control word determines the frequency accuracy. And once the frequency control word is updated, the output frequency is changed, and the frequency hopping rate is high. Compared with the phase-locked loop frequency synthesis technology, the method has wider application and more stable output under lower frequency; meanwhile, the DDS is essentially of a frequency division structure, so that the output frequency is narrow; with the development of the prior art and the application requirement, the DDS chip has the characteristic of low power consumption and small volume, and how to apply the DDS chip to embedded devices, mobile terminals and other devices in cooperation with a certain peripheral circuit is the current development trend.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists in the above-mentioned technique, the utility model provides a digital signal generator based on DDS technique, its design simple structure, output are stable, response speed is fast, control is convenient, can directly carry out board and carry signal output adjustment and demonstration, directly know and control system output.
In order to achieve the above object, the present invention provides a digital signal generator based on DDS technology, which includes a PCB board, wherein the PCB board is provided with a single chip and an AD9833 type chip, and the AD9832 type chip includes a plurality of frequency registers and a phase register; the signal input pin of the singlechip is connected with the ground through a switch, the output end of the singlechip is connected with the input end of an AD9833 type chip, and the output end of the AD9833 type chip is used for being connected with an equipment terminal; the control switch switches on and off an input signal to the singlechip, the singlechip outputs a signal to the AD9833 type chip according to the on-off signal, and the AD9833 type chip switches the frequency register or/and the phase register according to the input signal of the singlechip to change the output waveform of the output end.
In a specific scheme, the singlechip is an STC8 type singlechip; the STC8 single chip microcomputer also comprises a pair of crystal oscillator pins, the crystal oscillator pins are connected with a crystal oscillator circuit, and the frequency of the crystal oscillator circuit is 1KHz-1 MHz.
In a specific scheme, the STC8 type single chip microcomputer comprises a 64KFLASH program memory for storing word stock data.
In a specific scheme, the AD9833 type chip comprises a sclk port, an sdata port and a fsync port which are used for being connected with the single chip microcomputer, and is communicated with the single chip microcomputer through a three-wire SPI protocol.
In a specific scheme, the frequency register is a 28-bit frequency control word register.
The specific scheme also comprises a power module, wherein the power module comprises an LM1117-3.3 chip and an LM1117-3.3 chip, and the power module comprises a power input end used for being connected with an external power supply and a power output end used for being connected with the singlechip and the AD9833 chip; and the power output end and the power input end are connected with the ground through a capacitor.
According to the specific scheme, an RS232 interface or a usb interface is arranged on the circuit board, and the RS232 interface or the usb interface is electrically connected with the power input end of the LM1117-3.3 chip and used for electrically connecting an external input chip and the power conversion chip.
In a specific scheme, a matrix key and a USB interface which are used for being connected with the output end of the AD9833 type chip are also arranged on the circuit board; for connecting the AD9833 chip with the device terminals.
According to the specific scheme, the single chip microcomputer and the AD9833 type chip are electrically connected through a conductor layer on the circuit board, and the line width and the line space of the conductor layer are smaller than 6 mil.
The utility model has the advantages that: the utility model provides a DDS technology-based digital signal generator, including the PCB board, be equipped with singlechip and AD9833 type chip on the PCB board, AD9832 type chip includes a plurality of frequency register and phase register; the signal input pin of the singlechip is connected with the ground through a switch, the output end of the singlechip is connected with the input end of an AD9833 type chip, and the output end of the AD9833 type chip is used for being connected with an equipment terminal; the control switch switches on and off an input signal to the singlechip, the singlechip outputs a signal to the AD9833 type chip according to the on-off signal, and the AD9833 type chip switches the frequency register or/and the phase register according to the input signal of the singlechip to change the output waveform of the output end; compared with the prior art, the utility model has the advantages of simple structure, stable, the response speed of output is fast, control is convenient, can directly carry out board and carry signal output adjustment and demonstration, directly know and control system output.
Drawings
FIG. 1 is a structural diagram of the modules of the present invention;
FIG. 2 is a circuit diagram of the single chip microcomputer according to the present invention;
FIG. 3 is a circuit diagram of the DDS chip of the present invention;
fig. 4 is a circuit diagram of the power module of the present invention.
The main element symbols are as follows:
u1 and a single chip microcomputer; SW, switch SW.
Detailed Description
In order to make the present invention clearer, the present invention will be further described with reference to the accompanying drawings.
As described in the background art, the DDS chip has the characteristic of low power consumption and small volume, so how to apply the DDS chip to embedded and mobile terminals and other devices in cooperation with a certain peripheral circuit is the current development trend; based on this, the utility model provides a digital signal generator based on DDS technique, including the PCB board, be equipped with singlechip U1 and AD9833 type chip on the PCB board, AD9832 type chip includes a plurality of frequency register and phase register; the signal input pin of the singlechip U1 is connected with the ground through a switch SW, the output end of the singlechip U1 is connected with the input end of an AD9833 type chip, and the output end of the AD9833 type chip is used for being connected with an equipment terminal; the control switch SW is used for switching on and off an input signal to the single chip microcomputer U1, the single chip microcomputer outputs a signal to the AD9833 type chip according to the switching-on and switching-off signal, the AD9833 type chip switches the frequency register or/and the phase register according to the input signal of the single chip microcomputer U1, and the output waveform of the output end is changed; compared with the prior art, the utility model has the advantages of simple structure, output are stable, response speed is fast, control is convenient, can directly carry out board and carry signal output adjustment and demonstration, directly know and control system exports.
In the embodiment, the singlechip U1 is a singlechip U1 with STC8 model; the STC8 type single chip microcomputer U1 further comprises a pair of crystal oscillator pins, the crystal oscillator pins are connected with a crystal oscillator circuit, and the frequency of the crystal oscillator circuit is 1KHz-1 MHz; the STC8 type single chip microcomputer U1 comprises a 64KFLASH program memory for storing word bank data; the specific type of the singlechip U1 is as follows: the STC8A8K64S4A12 single-chip microcomputer U1 has the advantages of high speed, small size, rich in on-chip resources and low cost; the single chip microcomputer U1 adopts an internal crystal oscillator and an internal reset structure, the frequency of the internal crystal oscillator is 24MHz, the time sequence requirement of a system can be completely met, and the single chip microcomputer U1 can be driven only by a power supply; the crystal oscillator circuit is arranged on the circuit board for standby; the design requires a frequency range of 1KHz to 1MHz and a stepping precision of 1 Hz.
In the embodiment, the AD9833 type chip comprises a sclk port, an sdata port and a fsync port which are used for being connected with the single chip microcomputer U1, and is communicated with the single chip microcomputer U1 through a three-wire SPI protocol; the frequency register is a 28-bit frequency and can realize the adjustment of 0.1Hz precision under a 25MHz system clock; the square wave, sine wave and triangular wave output can completely meet the design requirements by modifying the control register.
In the embodiment, the power supply module comprises an LM1117-3.3 chip and an LM1117-3.3 chip, and comprises a power supply input end used for being connected with an external power supply and a power supply output end used for being connected with a single chip microcomputer U1 and an AD9833 type chip; the power output end and the power input end are connected with the ground through a capacitor; the LM1117-3.3 chip is matched with a large filter capacitor to provide stable power supply for the system.
In the specific scheme, an RS232 interface or a usb interface is arranged on the circuit board, and the RS232 interface or the usb interface is electrically connected with the power input end of the LM1117-3.3 chip and is used for electrically connecting an external input chip and a power conversion chip; the whole system can directly take electricity from a USB interface by using 3.3V and 5V compatible power supply; meanwhile, the RS232 provides conversion between the U1TTL level and the RS232 level of the single chip microcomputer, communication with other devices such as a computer is facilitated, and the RS232 level conversion uses an SP3220 chip and has the characteristics of stable operation, wide acceptable level range, low power consumption and the like.
The circuit board is also provided with a matrix key and a USB interface which are used for connecting with the output end of the AD9833 type chip; the AD9833 type chip is connected with the equipment terminal; the peripheral devices are mainly used for later function expansion, and the expandable functions comprise a rotary encoder, on-board key control, a USB serial port and the like;
in a specific scheme, the single chip microcomputer U1 and the AD9833 type chip are electrically connected through a conductor layer on a circuit board, and the line width and the space between the conductor layers are both less than 6 mil; when the circuit board is designed, the surface mount packaging is adopted as much as possible, so that the system volume is further reduced; in addition, analog ground and digital ground are isolated during drawing on the circuit board, and copper is laid on the front surface in a large area, so that mutual interference of circuits is reduced as much as possible; the minimum 6mil line width and line spacing are used in wiring, mainly in order to meet the requirements of single chip microcomputer U1 packaging and DDS chip packaging; the system test can reach the design index, the waveform is stable and accurate in frequency, and the waveform jitter is small.
The utility model discloses, use interrupt program as far as possible on the software flow to realize the jump and the operation between each function. The main part comprises a UART serial port, an SPI drive, an OLED screen drive, serial port instruction conversion and the like.
The above disclosure is only for the specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.
Claims (9)
1. A digital signal generator based on DDS technology comprises a PCB and is characterized in that a singlechip and an AD9833 type chip are arranged on the PCB, and the AD9832 type chip comprises a plurality of frequency registers and phase registers; the signal input pin of the singlechip is connected with the ground through a switch, the output end of the singlechip is connected with the input end of an AD9833 type chip, and the output end of the AD9833 type chip is used for being connected with an equipment terminal; the control switch switches on and off an input signal to the singlechip, the singlechip outputs a signal to the AD9833 type chip according to the on-off signal, and the AD9833 type chip switches the frequency register or/and the phase register according to the input signal of the singlechip to change the output waveform of the output end.
2. The DDS technology-based digital signal generator of claim 1 wherein the single-chip microcomputer is a STC8 type single-chip microcomputer; the STC8 single chip microcomputer also comprises a pair of crystal oscillator pins, the crystal oscillator pins are connected with a crystal oscillator circuit, and the frequency of the crystal oscillator circuit is 1KHz-1 MHz.
3. The DDS technology-based digital signal generator of claim 2 wherein the STC8 model single chip microcomputer includes a 64KFLASH program memory for storing word stock data.
4. The DDS technology-based digital signal generator as claimed in claim 1, wherein in a specific embodiment, the AD9833 type chip includes a sclk port, an sdata port and a fsync port for connecting with the single chip, and communicates with the single chip via the three-wire SPI protocol.
5. The DDS technology-based digital signal generator of claim 4 wherein the frequency register is a 28-bit frequency control word register.
6. The DDS technology-based digital signal generator of claim 1, further comprising a power module, wherein the power module comprises an LM1117-3.3 chip, and the LM1117-3.3 chip comprises a power input terminal for connecting with an external power supply and a power output terminal for connecting with the single chip microcomputer and an AD9833 type chip; and the power output end and the power input end are connected with the ground through a capacitor.
7. The DDS technology-based digital signal generator of claim 6, wherein the circuit board is provided with an RS232 interface or usb interface, and the RS232 interface or usb interface is electrically connected to the power input terminal of the LM1117-3.3 chip for electrically connecting the external input and the power conversion chip.
8. The DDS technology-based digital signal generator as claimed in claim 1, wherein the circuit board is further provided with a matrix key and a USB interface for connecting with an output terminal of an AD9833 type chip; for connecting the AD9833 chip with the device terminals.
9. The DDS technology-based digital signal generator of claim 1, wherein the single chip microcomputer and the AD9833 chip are electrically connected through a conductor layer on the circuit board, and the line width and the line-to-line width of the conductor layer are less than 6 mil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023273046.0U CN213690296U (en) | 2020-12-29 | 2020-12-29 | Digital signal generator based on DDS technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023273046.0U CN213690296U (en) | 2020-12-29 | 2020-12-29 | Digital signal generator based on DDS technology |
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| CN213690296U true CN213690296U (en) | 2021-07-13 |
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| CN202023273046.0U Active CN213690296U (en) | 2020-12-29 | 2020-12-29 | Digital signal generator based on DDS technology |
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| CN (1) | CN213690296U (en) |
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Effective date of registration: 20240116 Address after: Room 318, 3rd Floor, No. 286 Daming Road, Qinhuai District, Nanjing City, Jiangsu Province, 210001 Patentee after: Jiangsu Ningjin Technology Co.,Ltd. Address before: No. 903, floor 9, building 1, No. 42, Shuxi Road, high tech Industrial Park, Jinniu District, Chengdu, Sichuan 610000 Patentee before: Chengdu ningjinwei Communication Technology Co.,Ltd. |