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TDM-PAM Transmitter and Receiver Scientech TechBook 2152 is a communication system where the message signal is modulated using Pulse Amplitude Modulation and multiple access is provided using Time Division Multiplexing. The message information is encoded in the amplitude of a series of signal pulses and transmitted using Time Division Multiplexing (i.e. in different time slots).
The TechBook demonstrates following modes of operation between transmitter and receiver -
Mode 1: 3 signals communication (Clock/Sync/Modulated Signals)
Mode 2: 2 signals communication (Sync/Modulated signals); Clock is recovered at receiver.
Mode 3: 1 signal communication (Modulated signal); Clock and Sync are recovered at receiver
Crystal controlled clock
On-board synchronized analog Signal Generator (DC and Sine wave)
Demonstrates sampling and reconstructed as per Nyquist criterion
Four switch selectable sampling frequencies
Sampling pulse duty-cycle selectable
On-board Pulse Generator
Four analog input channels to demonstrate TDM-PAM
Generation of clock at receiver by PLL
Fourth order Butterworth Low Pass Filter
Scope of Learning
Pulse Amplitude Modulation technique
Time Division Multiplexing and Demultiplexing
PLL as Frequency Multiplier to generate clock from sync signal
Three modes of operation between transmitter and receiver 4 (3 signals/ 2 signals/ 1 signal communication)
Effect of varying duty cycle of sampling pulse on signal 4 reconstruction
Effect of different sampling frequencies on TDM-PAM & demodulation technique