Types of DACs

A marginally stable system is one that, if given an impulse of finite magnitude as input, will not “blow up” and give an unbounded output, but neither will the output return to zero. A bounded offset or oscillations in the output will persist indefinitely, and so there will in general be no final steady-state output.

The main purpose of the A/D converters within a data acquisition system is to convert conditioned analog signals into a stream of digital data so that the data acquisition system can process them for display, storage, and analysis.

• Summing Amplifier. Since digital to analog conversion is simply a weighted sum of the binary input, a circuit called a summing amplifier is used.
• R-2R Ladder. This is the simplest type of DAC and needs only two resistor values arranged in a ladder.
• PWM DAC.

ADCs sample continuous analog signals over an input voltage range and convert them into digital representations (words) with resolution equal to the ADC’s number of bits. DACs convert digital input code into analog output signals, essentially providing the opposite function of an ADC.

Equalizer

In signal processing, reconstruction usually means the determination of an original continuous signal from a sequence of equally spaced samples. This article takes a generalized abstract mathematical approach to signal sampling and reconstruction.

Aliasing is generally avoided by applying low pass filters or anti-aliasing filters (AAF) to the input signal before sampling and when converting a signal from a higher to a lower sampling rate.

What conditions must be fulfilled in a good digital communication system? Explanation: Some of the conditions which must be satisfied in a digital communication system are high data rate, high fidelity, low bandwidth, low transmit power and low transmitter and receiver complexity.

These include email, phone calls, video conferencing, and many types of instant messaging like SMS and web chats. Even blogs, podcasts, and videos are considered forms of digital communication.

Pulse Code Modulation PCM.

What is necessary for digital communication? Explanation: Bit, character, frame synchronization and precision timing is necessary for digital communication. This is considered as a disadvantage of digital communication.

The three most popular forms of digital communication is texting, social media and mobile devices, i think these are popular because these days its all that people are on is either there phones, on social media, there texting or there on there mobile devices.

Digital communication is used everyday when someone calls 911 for help. This is a lot more enhanced because of the fact that we have cell phones and all you need to do is tap your phone. This is a lot more effective rather than going to a payphone. This is how Digital Communication can help you in your life.

Digital signals can convey information with less noise, distortion, and interference….Disadvantage of Digital Signals :

• Sampling may cause loss of information.
• A/D and D/A demands mixed-signal hardware.
• Processor speed is limited.
• Develop quantization and round-off errors.
• Systems and processing is more complex.

Analog Signals: Advantages and Disadvantages

• Analog signals are easier to process.
• Analog signals best suited for audio and video transmission.
• Analog signals are much higher density, and can present more refined information.
• Analog signals use less bandwidth than digital signals.

The configuring process of digital signals is easier than analog signals. Digital signals can be saved and retrieved more conveniently than analog signals. Many of the digital circuits have almost common encoding techniques and hence similar devices can be used for a number of purposes.