Description
Analog Signal Sampling & Reconstruction Trainer
Experiment Content :
Signal Waveform Generation
The Sampling Process
Nyquist Sampling Theorem
Effect of Sampling Frequency
Quantization and Aliasing
Analog-to-Digital Conversion (ADC)
Digital-to-Analog Conversion (DAC)
Sample and Hold Circuit
Low-Pass Filter in Signal Reconstruction
Sine Wave Reconstruction
Square Wave Reconstruction
Low Sampling Rate Effects
High-Frequency Sampling and Anti-Aliasing
Noise Effects in Sampling
Reconstruction Filter Frequency Response
Oversampling and Signal Accuracy
Real-Time Signal Sampling
Step and Impulse Sampling
Reconstruction Delay Measurement
Amplitude and Frequency Modulation Analysis
Technical Specification :
1. Signal Generation Module
Function Generator
Waveforms: Generates sine, square, and triangular waveforms.
Frequency Range: 1 Hz to 1 MHz, adjustable.
Amplitude Control: 0–5V peak-to-peak.
Duty Cycle Adjustment: For square wave generation, adjustable from 10% to 90%.
Controls: Knobs for frequency, amplitude, and duty cycle
adjustments.
Oscillator ICs:
XR2206 or 555 Timer IC used as an additional signal generation
source for stability and flexibility.
2. Sampling Circuit
Sample and Hold Circuit
Op-Amps: LM741 or LM358 used for buffering and amplification.
Analog Switches or Multiplexers: CD4051 or CD4066 to control
sampling intervals accurately.
Hold Capacitors: High-quality capacitors for holding sampled
voltage with minimal leakage.
Analog-to-Digital Converter (ADC)
Resolution: 8-bit or 10-bit resolution.
Input Range: 0–5V.
Model Options: MCP3008 (10-bit, 8-channel) or ADC0804
(8-bit).
Sampling Rate: Adjustable up to 10 kHz for real-time applications.
3. Reconstruction Circuit
Digital-to-Analog Converter (DAC)
Resolution: 8-bit or 10-bit resolution for accurate reconstruction.
Model Options: DAC0808 or custom R-2R ladder network for
simplicity.
Output Range: 0–5V analog output after reconstruction.
Low Pass Filter (LPF)
RC Filter Network: Built using resistors and capacitors for
smoothing.
Cutoff Frequency: Adjustable, typically around 1 kHz.
Active Filter Design: Uses op-amps for sharper cutoff
response if required.
Purpose: To smooth the reconstructed signal and minimize
quantization noise.
4. Clock Source
Crystal Oscillator
Frequency Options: 1 MHz, 4 MHz, and 10 MHz, switchable
for flexible sampling rates.
555 Timer IC
Used as a pulse generator to provide clock signals at various
frequencies for sampling timing.
Clock Rate Control: Adjustable potentiometer to fine-tune
clock frequency.
5. Display and Visualization
Oscilloscope Output Terminals
BNC connectors for connecting external oscilloscopes to
view waveforms directly.
LCD Display Module
Displays digital values of sampled and reconstructed signals,
sampling frequency, and other important parameters.
Seven-Segment Display
Shows digital data values for easier observation and quick
reference during experiments.
6. Power Supply
DC Power Supply
Input: 220V AC mains power.
Output: Provides regulated 5V and 12V DC outputs for
powering ICs and components.
Voltage Regulators
LM7805 for 5V output and LM7812 for 12V output, ensuring
stable power supply to sensitive components.
Protection Features: Built-in fuse for overload protection and
to prevent short circuits.
7. Supporting Components
Breadboard or PCB Layout
Spacious layout to allow for easy assembly and connection of components.
Connectors and Jumpers
High-quality connectors and jumpers to facilitate reliable
connections between modules.
Potentiometers
Used for fine control over parameters such as amplitude,
frequency, and sampling intervals.
Passive Components
Resistors, capacitors, and inductors for various filtering,
timing, and voltage stabilization functions
Accessories :
Single-phase power cord
4mm Banana Socket-1Set
User Manual
Other’s :
Country of Origin: China
Manufacturing: Assemble in Bangladesh
Installation
Warranty: 01 year
