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Digital Block For A Function Generator - College Paper

Digital Block For A Function Generator


The Digital Block is the heart of this digitally controlled function generator. Symmetry and frequency variation is direct result of the design of this block. 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 are symmetry variable in five steps from 0.1 to 0.5. The last eight frequencies only managed to achieve symmetry variations 0.5 and 0.25. This is due to some limiting factors that will be discussed later. The table of achievable frequencies ...

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the control module, counter module, filter control module and 8-bit D/A. The D/A chosen is the DAC0801LCN. It’s 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 bus lines.
As the name suggests the control module takes user inputs, processes them and sends them out to the respective 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 wave and the filter selector module selects which filter in the filter block to pass the signal through.
While extensive testing has been done on the functionality module, the control module and filter selector module are relatively simple and have not been tested due to the inability to do so. The control module consists primarily of switches and ROM’s while the filter selection module ...

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Symmetry: This employs the circular switch. 8 different symmetries are provided. Consequently, a 3-bit ADC is used. The provided symmetries and their binary is as follows:

000: 8/16 | 001: 9/16 | 010: 10/16 | 011: 11/16 | 100: 12/16 | 101: 13/16 | 110: 14/16 | 111: 15/16 |
Amplitude: This also utilizes the circular switch. This control signal is fed straight through to a multiplexer in the amplifier block. We are providing 16 different amplitudes. Therefore, a 4-bit ADC is used. The amplitudes and their corresponding binary is as follows:

0000: 10mV |0001: 20mV |0010: 40mV |0011: 60mV |
0100: 80mV |0101: 0.1V ...

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PAPER DETAILS
Added: 8/10/2006 09:26:57 AM
Category: Technology
Type: Premium Paper
Words: 2356
Pages: 9

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