Wave Generator using Atmega16

Jan 26, 2018Download as PPTX, PDF0 likes372 views

tayyabhasnainkhan

this presentation includes information and circuit diagram for atmega16 based function generator using c-code

WAVE GENERATOR
(AVR DDS Signal Generator)

Table of Contents
Abstract
1.0 Introduction
2.0 Components
3.0 Working of circuit
4.0 Firmware
5.0 Program Structure
6.0 Simulation
7.0 Veroboard implementation
8.0 Testing
9.0 Learning Outcomes
10.0 Conclusion

Introduction
The project assigned as mentioned earlier was the development of
the Wave Generator with the specifications that it can output four
kinds of waves (Sine, Triangular, Square, Sawtooth) within the
user dependent frequency range of 100-10kHz.

Working
It uses R-2R resistor ladder for digital to analog
(DAC) converter. It is an electrical circuit made
from repeating units of resistors.
An R–2R Ladder is a simple and inexpensive way
to perform digital-to-analog conversion, using
repetitive arrangements of precise resistor
networks in a ladder-like configuration.
Resistors used with the more significant bits (b-bit
significance is used here) must be proportionally
more accurate than those used with the less
significant bits.

Generator has three outputs:
Universal DAC output through R-2R ladder
PWM
Impulse (SQ)
Universal output (OUT) is a signal output from DAC. This
output is to form various signals like sawtooth, sine, square,
triangle.
PWM channel is used to form for PWM signal output –
directly from timer.

$Disadvantage: for an n-bit ADC, the number of resistors grows exponentially, as 2 n {displaystyle 2^{n}} resistors are required, while the R–2R resistor ladder only increases linearly with the number of bits, as it needs only 2 n {displaystyle 2n} resistors. Advantage: higher impedance values can be reached using the same number of components. In this schematic R=10kohm. By using 8 bits and 5V step value is about 18.5mV. This is enough for getting average quality signals.$

Conclusion
Concluding with all the required information of the
components in use, development of circuit and its
simulation on software. Achieving the desired output
and observing it to manipulate the results held major
importance in clearing the concepts regarding the
concerned topic.

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Wave Generator using Atmega16

2. WAVE GENERATOR (AVR DDS Signal Generator)

3. Table of Contents Abstract 1.0 Introduction 2.0 Components 3.0 Working of circuit 4.0 Firmware 5.0 Program Structure 6.0 Simulation 7.0 Veroboard implementation 8.0 Testing 9.0 Learning Outcomes 10.0 Conclusion

4. Introduction The project assigned as mentioned earlier was the development of the Wave Generator with the specifications that it can output four kinds of waves (Sine, Triangular, Square, Sawtooth) within the user dependent frequency range of 100-10kHz.

5. Working It uses R-2R resistor ladder for digital to analog (DAC) converter. It is an electrical circuit made from repeating units of resistors. An R–2R Ladder is a simple and inexpensive way to perform digital-to-analog conversion, using repetitive arrangements of precise resistor networks in a ladder-like configuration. Resistors used with the more significant bits (b-bit significance is used here) must be proportionally more accurate than those used with the less significant bits.

6. Generator has three outputs: Universal DAC output through R-2R ladder PWM Impulse (SQ) Universal output (OUT) is a signal output from DAC. This output is to form various signals like sawtooth, sine, square, triangle. PWM channel is used to form for PWM signal output – directly from timer.

7. Disadvantage: for an n-bit ADC, the number of resistors grows exponentially, as 2 n {displaystyle 2^{n}} resistors are required, while the R–2R resistor ladder only increases linearly with the number of bits, as it needs only 2 n {displaystyle 2n} resistors. Advantage: higher impedance values can be reached using the same number of components. In this schematic R=10kohm. By using 8 bits and 5V step value is about 18.5mV. This is enough for getting average quality signals.

8. Block diagram

9. Circuit Diagram

10. Simulation

11. Some Outputs

12. Conclusion Concluding with all the required information of the components in use, development of circuit and its simulation on software. Achieving the desired output and observing it to manipulate the results held major importance in clearing the concepts regarding the concerned topic.

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Wave Generator using Atmega16

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