Digital Communications

Topics: Digital signal processing, Analog-to-digital converter, Alternating current Pages: 2 (624 words) Published: November 22, 2012

The modicom 1 board, first in my observation is the power input these are the electrical input connections necessary to power the module. The LJ Technical Systems' "I.C. Power 60" or "System Power 90" is the recommended power supplies. Then second is the sampling control logic is the circuitry generates the timing and control signals that sample the input waveform, and also creates a sinusoidal 1 kHz signal for use during the MODICOM 1 practical exercises. It is recommended that this signal is used for most of the experiments, as you will find that it is difficult to synchronize more than one oscilloscope trace when the input comes from an external source. Then third is the sampling circuit is the signal at the ANALOG INPUT socket is sampled at a rate, and for duration, which depends on the applied sampling control signal. Then fourth is the second order low pass filter this is a filter having a 3.4 kHz bandwidth. Then lastly is the fourth order low pass filter is similar to the Second Order Low Pass Filter but has a steeper cut off gradient (represented by the graph on the board).


MODICOM 1 incorporates and on-board waveform generator that can be selected to provide a 1 kHz sine wave. An on-board pulse generator, giving a choice of 5 discrete sampling frequencies and 9 discrete duty cycles, is also provided. These on-board signal sources are phase locked, ensuring that the sampled waveforms appear stationary when observed on an oscilloscope.


In the experiment, we study the Modicom 1 Demonstration. The purpose of this is to understand the functions of each block using input analog signal. We connect the supplies to the board; we ensure sampling control board “internal” position. The duty cycle selector position is in 5. We link 1 kHz sine wave output to analog input. Then we turn on the power supply. Ensuring that all the connection are connected properly.

We need to display the input sine wave and sample...
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