8 Bit Serial To Parallel Converter Vhdl Code For Digital Clock
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In practice, the shift register must be used in combination with an error detection and correction circuit. Due to the high speeds of the serial converter (compared to the parallel bus speed), any errors have a significant impact on the communication. To eliminate errors, it is desirable to use a simple error detection and correction circuit which can correct most of the errors.
If the error rate is so high that no error detection and correction circuit can correct all the errors, the parallel data bus must be split into two parallel bus, so errors are detected only on each half of the bus.
The converter introduces the delay of the serializer section whose function is to provide the parallel data (Figure 4) to the parallel to serial convertor. Of course, the parallel to serial converter is represented with a sigma-delta modulator. The converter has two output ports: input and output. The input port is the parallel to serial converter. The output port is connected to an analyzer that takes the serial data and the clock and creates the vectors M, K, D and R. The clock is necessary for the serial data to be read and output. It is represented with a clock generator.
The parallel to serial converter consists of a pre-amplifier, a sigma-delta modulator and a post-amplifier. The pre-amplifier is a first stage, the post-amplifier is a second stage. The sigma-delta modulator is placed between the two stages.
Sigma-delta modulation has been used with success to reduce the noise of the input of the converter. In our case, we have a DC voltage applied to the sigma-delta modulator. The DC voltage is part of the input of the pre-amplifier. The sigma-delta modulator manages to reduce the noise of the DC voltage. The sigma-delta modulation of the input signal produces the output of the pre-amplifier with the gain of the system. The signal after this stage has enough bandwidth (Figure 5). Figure 5 shows the sigma-delta modulator.
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