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DE2 based direct digital synthesis (DDS) design
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DDS based on sampling theorem, first of all need to generate waveforms are sampled, the sampled value is quantized into a lookup table, and then read the data via the address, then d/a converters are analog. To output a sine wave as an example, a is the amplitude, use multipliers to get, we mainly control phase, namely the control of frequency and phase. Time interval, such as output, can be viewed as a phase of cumulative changes. Phase is the ROM address signal is output by changing the step size k, to control the frequency of the effect.
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Design of Altera DE2 based digital stopwatch
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When the frequency is 100Hz, the clock of 100ms, 1s, 10s, 1min and 10min of 6 counters will be generated, which has & lt; span style = & quot; font- size:10.5pt;font-family : four key inputs, using finite state machine to respond to the control of external keys, so as to control the state of the stopwatch and realize the functions of start, pause, stop and reset of the stopwatch. One second clock is used to control the change of pipeline.
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