I would suggest that you start first with reading the datasheet for the LTC to understand the interface, followed by the user guide or schematics for the board that you are using to understand how the device is configured and connected to the FPGA and then write the code to implement the interface and output the required digital SIN values.
I am working with spartan3e. Your system will need to generate and convert data at a minimum of double the signal frequency you desire.
Read up on the concept "nyquist limit". Look at its settling time. Look at the maximum serial bit frequency for data transfer. Look at the minimum number of serial clock cycles for transferring a single data value.
Ignoring settling time this cannot be ignored, actuallydata transfer alone will barely permit 1MHz output and only a sinewave, nothing more complex. When you add a reasonable reconstruction filter to the DAC output to filter sampling frequency noise, you are unlikely to be happy with the analogue output result.
Then you will know enough to select a proper DAC for your application. You haven't mentioned signal distortion, amplitude, linearity, or noise requirements. You need to learn what these attributes mean, in order to design a proper sampled system.
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Showing results for. Search instead for. Did you mean:. I am a student ,i am new to FPGA. I have done some basic experiments on Spartan 3E Kit. Tahnks, Vihang Naik, Student of M. Tech 1, COE,Pune. Vihang Naik.
How to Connect an ADC to an FPGA
Tags 1. Tags: Homework. All forum topics Previous Topic Next Topic. If not you should before posting. Too many results?Remember Me? How to code ADC in Verilog? Can somebody help me? D to A generates analog voltage which is compared to the input voltage. This type of A to D takes a fixed amount of time proportional to the bit length. Re: verilog flash adc when we code a DAC in verilog, the PWM signal is not an analog one it is a digital signal with 1 bit.
Part and Inventory Search. Welcome to EDABoard. Design Resources. New Posts. Schottky diode on ADS 1. Op-amp matching simulation vs expectations 3. PSS does not converg S21 parameter provides different gain than the one provided by AC analysis Should I use it afterwards? Fully differential amplifier with simple CMFB scheme on the differential pair HFSS radiation pattern multiple ports 0. Output current op amp-LTspirce simulation Altium Designer- How to order channel index?
What is the area unit in Synopsys DC's area report? How to compile VCS simulator simv statically? Replacing relay to trigger a device input 7. Fully differential Op-amp with input common mode voltage different from the output 7. Can Innovus include user comments in Netlist 1.
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EE World Online. Design Fast. The time now is All rights reserved.Remember Me? Re: verilog a code for 8 bit ideal ADC Hi tibusso.
Designing a Sigma-Delta ADC from Behavioral Model to Verilog and VHDL
Re: verilog a code for 8 bit ideal ADC. Originally Posted by sss-timer. Originally Posted by tibusso. How to model ideal switch using ideal dependent sources? Part and Inventory Search. Welcome to EDABoard. Design Resources. New Posts. Schottky diode on ADS 1. Op-amp matching simulation vs expectations 3. PSS does not converg S21 parameter provides different gain than the one provided by AC analysis Should I use it afterwards?
Fully differential amplifier with simple CMFB scheme on the differential pair HFSS radiation pattern multiple ports 0. Output current op amp-LTspirce simulation Altium Designer- How to order channel index? What is the area unit in Synopsys DC's area report? How to compile VCS simulator simv statically? Replacing relay to trigger a device input 7. Fully differential Op-amp with input common mode voltage different from the output 7. Can Innovus include user comments in Netlist 1.
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View This Post. June 2, at PM. Though I was able to implement the example I havent understood how that works at all. Even a pinout of the ADC and what each of those pin do would be a good starter. The above page has pointers to the full board level schematic.
We are not mind readers. The schematic doesnt really show the ADC chips output pins only the analog input pins are mentioned. I guess its because its integrated by I dont understand that how will I send e. The user guide gives description about the ADC modular IP but doesnt provide much detail to understand the full working of the IP core to manipulate it.
Login to answer this question. Related Questions Nothing found. For more complete information about compiler optimizations, see our Optimization Notice.Using disparate tools and languages to develop analog mixed-signal ICs makes the design process prone to error, time-consuming, and complicated.
By using a Simulink model as the cornerstone of design, teams can test and verify the design at all stages of development, reducing the chances of discovering expensive structural changes or bugs at the implementation stage. The files for this design are available for download.
We encourage you to open the Simulink models and explore different aspects of the design. Sigma-delta ADC converters are used almost exclusively in applications that require high-resolution output, such as high-fidelity audio or industrial measurements. To achieve the required high resolution, the analog signal must be sampled at rates much higher than the Nyquist rate.
In general, the complexity of the circuit design is proportional to the sampling rate. For this reason, sigma-delta ADCs have traditionally been used for sampling low-frequency signals—that is, signals with relatively low Nyquist rates, such as speech in mobile phones. A sigma-delta ADC consists of an analog and a digital section Figure 1.
The analog section, which includes a sigma-delta modulator, samples the input at a high rate and produces a binary output whose average value over time tracks the analog input.
The digital section, which includes decimation filtering, finds the average value by running the output of the sigma-delta modulator through a low-pass decimating FIR filter. Later in this article, we will exploit the binary nature of the filter's input to implement a very efficient filter architecture. We begin by developing a high-level behavioral Simulink model. The model is in floating point.
We use it as a graphical representation of the system and as an executable specification. It is a one-stage FIR filter that decimates the signal by a factor of 64, and has about 3, taps. The reason is that the filter is very large and computationally expensive. As we elaborate the design, we will reduce the filter size to prepare it for implementation.
We will then use the binary nature of the input to the filter to make the design even more efficient. Finally, we will convert the numerics to fixed point. The high-level behavioral model will serve as a reference throughout. As a one-stage filter with about taps, our original digital filter requires a significant number of arithmetic operators.
Each stage has 40, 12, and filter taps, respectively, and each stage decimates the signal by a factor of 8,2, and 4, respectively, for a total of This approach reduces the total number of coefficients by a factor of about 10, noticeably reducing the number of arithmetic operations required. We compare the frequency response of the original one-stage filter with the new three-stage filter Figure 3. We see that the magnitude response of the three-stage filter matches the magnitude response of the original one-stage filter very closely.
In the Simulink environment, we test our elaborated design and verify that it compares well with the behavioral model Figure 4. Using a multi-rate, multi-stage filter design reduces computational complexity dramatically, but introduces a greater group delay for the filter.
This larger delay is noticeable in the filter output traces shown at the bottom of Figure 4, where the end of the second trace visibly lags behind the end of the first trace because of the greater filter delay.
As mentioned above, the first stage is a tap FIR filter. Generally, to implement such a filter we would need 40 multiplications and 39 additions for every output sample. However, as the analog section feeds a binary signal to the first stage of the filter, we can implement the first stage using look-up tables. This method needs no multiplications and only 4 additions. The other two stages will be implemented in the conventional way. In this case, for every 8 binary input samples, the filter generates one output sample.All required study material and Verilog code are attached to this post, so you can easily download and try on your own hand.
Here, we are mentioning only important point. It gives first four zero at four negative edges of SCLK, and then it gives 12 bit digital data corresponding to applied analog input at next 12 negative edges of SCLK. So, our first task is to save this serial data into a register using serial to parallel conversion.
After 16 negative edges of SCLKwe have finally 12 bit data into the shift register. Verilog Code for this conversion is attached. Verilog code for seven-segment LED display is also attached.
It will be useful for you for this interfacing and also for the future. Best of luck…, try this one because practice makes man perfect. And, yes also if you have any doubt related to this project, please ask and also provide us your valuable feedback. This work is done by me and my friend Sumit Gautam, M. Thank you!!!! You can also download above given code using link given below:.
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Analog Tutorial 5: Verilog-A
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Internally this verilog implementation holds a count of the current clock cycle. When the clock cycles are Once all 12 bits of data are read it will store the reading into internal memory with 8 addresses, which can be read by another module. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign up. Verilog Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit Fetching latest commit…. This implementation will read the analog reading into a shift register. License BSD. You signed in with another tab or window.
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