Home » , , » DESIGN AND IMPLEMENTATION OF LOW COST DIGITAL FUNCTION GENERATOR

DESIGN AND IMPLEMENTATION OF LOW COST DIGITAL FUNCTION GENERATOR

Presentation on DESIGN AND IMPLEMENTATION OF LOW COST DIGITAL FUNCTION GENERATOR

Objective
Designing a high performance function generator.
Automatic control of frequency range.
Low cost function generator.
Construction of designed function generator using the resources and lab of EEE department.
Why use Function Generator?
Measurements of AC gain at different frequencies.
Examination of the transient response.
Assessment of the overload margin of an amplifier.
Low levels distortion measurements.
Why use digital Function Generator?
Digital measurement of frequencies is possible.
Less harmonic distortion.
Automatic control of range selection.
Higher frequency range is possible.
No deviation between generated frequency & measured frequency.
Circuit diagram of generating wave
Circuit diagram of generating wave
Functional diagram of ICL8038
Functional diagram of ICL8038
The symmetry of the waveforms adjusted with the external resistor R512 & R511.
Frequency = 1/{ R512×C/0.66 (1 + R511/ (2R512-R511)}.
If R512=R511=R then 50% duty cycle is achieved.
Frequency of the waveform is a direct function of the DC voltage at pin 8.
Automatic control of range selection by a summing amplifier.
Circuit arrangement of summing amplifier
Circuit arrangement of summing amplifier
Interfacing keypad with microcontroller
Interfacing keypad with microcontroller
Programming the microcontroller
Programming the microcontroller
Wave observation
Wave observation
Frequency response for different waves
Frequency response for different waves
Frequency response for different waves

Frequency response for different waves
Cost analysis
Range of frequencies vs. Price
Range of frequencies vs. Price
Limitation
  1. Can not generate wave well at high frequency (above 65KHz).
  2. Below 10Hz triangular wave get distorted.
  3. Above 50 KHz small tilt produce in square wave.
  4. Bandwidth limitation.
  5. Unavailability of components.
Conclusion
While constructing the device we face lots of problem. But we tried to give our best. We believe that our designed function generator will be useful for laboratory work.
Submitted by Surajit Das Barman and Riman Das
Share this article :

0 comments:

Post a Comment

Please wait for approval of your comment .......