TDM Pulse Amplitude Modulation & Demodulation Trainer

SALIENT FEATURES :

• Crystal controlled Clock.
• On – board Sine Generator ( synchronised ).
• On – board Pulse Generator.
• 4 Analog input channels sampled and time division multiplexed.
• Five selectable sampling frequencies.
• Selectable Pulse Duty Cycle.
• Selectable Internal / External sampling.
• 4 channel Demultiplexer.
• Generation of clock at receiver by PLL system.
• Fourth order Butterworth low pass filters.

TECHNICAL SPECIFICATIONS :

• Crystal Frequency : 6.4 MHz.
• Analog Input Channels : 4.
• Multiplexing : Time Division Multiplexing.
• Modulation : Pulse Amplitude Modulation.
• On Board Analog Signal : 250 Hz, 500 Hz, 1 KHz, 2KHz
  (sine wave synchronized to sampling pulse, adjustable amplitude & separate variable DC level ).
• Sampling Rate : 16 KHz / channel.
• Sampling Pulse : With duty cycle variable from 0-90% in decade steps.
• Clock Regeneration at receiver : Using PLL.
• Low Pass filter cut – off frequency : 3.4 KHz.
• Test Points : 52.
• Power : 230V + 10% 50 Hz, 1 ? AC.
• Accessories : a. Detailed Instruction Manual.
  b. Set of Patch cords.

EXPERIMENTS :

1. Study of Pulse Amplitude Modulation ( PAM ) technique.
2. Study of Time Division Multiplexing ( TDM ) and demultiplexing.
3. Study of PLL as Frequency Mutiplier to generate clock from sync signal.
4. Study of three modes of operation to regenerate original signal.
5. 3 connections between transmitter and receiver (clock, sync, information ).
6. 2 connections ( information & sync ); clock generated at receiver.
7. 1 connection ( information only ) clock & sync derived at receiver.
8. Study of effect of varying duty cycle of sampling pulse and signal reconstruction.
9. Signal Sampling & Reconstruction using external Sampling input.