Digital Block For A Fucntion Generator :: essays research papers

Digital Block buildDesign introductionThe Digital Block is the heart of this digitally comptrollerled expire generator. Symmetry and frequency variation is direct result of the design of this forfend. In this design the emphasis was on simplicity and some target specifications at the top of the frequency variation were compromised in order to achieve greater simplicity. This design achieves 28 frequencies in the range of 100Hz to 100kHz. Whilst the 17 frequencies from the range 100Hz to 10kHz argon symmetry variable in five steps from 0.1 to 0.5. The last eightsome frequencies only managed to achieve symmetry variations 0.5 and 0.25. This is due to some limiting factors that departing be discussed later. The table of achievable frequencies can be found at the end of this report.User inputs atomic number 18 also digitally processed in this function generator and sent out as digital signals to different parts of this function generator namely the amplifier module. Also a per meate selector circuit is built in after the digital block. The exploiter inputs controlling frequency and symmetry are also built into this control block.Therefore it is clear that the digital block can be carve up into 4 distinct blocks, each with its own functionality. These blocks are the control module, sound reflection module, diffuse control module and 8-bit D/A. The D/A chosen is the DAC0801LCN. It&8217s specifications can be found in the appendix. The layout of this design is shown below.The interconnections will be discussed later but the thickness of the lines indicates the number of bits in the muckle lines.As the name suggests the control module takes user inputs, processes them and sends them out to the various(prenominal) modules. The functionality module generates the count, varying between 0 to 255 in 256 steps or in 64 steps. The 8-bit D/A changes this count into a waving and the filter selector module selects which filter in the filter block to pass the si gnal through. While extensive testing has been done on the functionality module, the control module and filter selector module are relatively simple and occupy not been tested due to the inability to do so. The control module consists primarily of switches and ROM&8217s while the filter selection module is made up of two analogue multiplexers. These modules are discussed in further detail in later sections.Control facultyIntroductionThis block essentially converts user input into digital signals. We have four user inputs coming in, and five control signals takingsted, with the extra output being generated internally.