3/21/2021 0 Comments Analog Waveform Generator
All in all, its an efficient way to create a DAC but requires more effort to get clean output.Whats A DAC How DACs Work And What are the common types of DACs And which to use for our projects.As well as generating analog waveforms any desired frequency (e.g Sawtooth, Triangular, and Sin Wave).This is also how we generate basic sound tones using microcontrollers.
Functionally, its the inverse of the ADC (analog-to-digital converter). And A DAC is remarkably cheaper than ADC by orders of magnitude. So, there is inherent quantization noise at a rate equal to the sampling rate of the DAC. As long as the bandwidth is less than Nyquist frequency (No violation to Nyquist sampling theorem). A reconstruction filter can be used to reduce quantization noise appearing at the analog output. Digital computers store, manipulate, read in, and send out Digital Data (0s 1s). So there should be a way to convert the digital representation back to analog signals. Another situation in which we need DACs is analog control systems. A digital computer can monitor a process and run the instructions of a control algorithm. But in order to send out the output of the control algorithm to actuators, it should be converted to an analog voltage and here DACs come to play. Some applications demand a high-frequency sampling rate for the DAC while others are demanding high-resolution DACs. And many other applications need to balance between high-frequency and resolution trade-off. Each input in the summing has powers-of-two values with most current or voltage at the most-significant bit. These precise voltages or currents sum to the correct output value. This is one of the fastest conversion methods but suffers from poor accuracy because of the high precision required for each individual voltage or current. This improves the precision due to the relative ease of producing equal valued-matched resistors. Its the cheapest, yet easiest, DAC you can build on your own. The binary input goes into the resistors and the analog output is obtained on the output of the op-amp. The values of these resistors are chosen carefully to produce a binary-weighted summation for the digital inputs. The analog voltage level at the output could be easily obtained by averaging the PWM signal. In technical terms, well filter out the high-frequency component of the PWM signal to leave only the average DC component.
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