Analog Signal And Digital Signal Pdf
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High precision applications require a well-designed low noise analog front end to get the best SNR, which requires an informed approach to choosing an ADC to fully and accurately capture sensor signals. Support components such as driver op amps and references are selected to optimize overall circuit performance. Real-world signals, such as vibration, temperature, pressure, and light, require accurate signal conditioning and signal conversion before further data processing in the digital domain.
- Analog vs Digital: What's the Difference?
- Difference Between Analog and Digital Signal
- Analog signal
An analog signal is any continuous signal for which the time-varying feature of the signal is a representation of some other time-varying quantity, i. For example, in an analog audio signal , the instantaneous voltage of the signal varies continuously with the pressure of the sound waves. It differs from a digital signal , in which the continuous quantity is a representation of a sequence of discrete values which can only take on one of a finite number of values. The term analog signal usually refers to electrical signals ; however, mechanical , pneumatic , hydraulic , and other systems may also convey or be considered analog signals. An analog signal uses some property of the medium to convey the signal's information.
Analog vs Digital: What's the Difference?
Get valuable resources straight to your inbox - sent out once per month. A signal is an electromagnetic or electrical current that carries data from one system or network to another.
In electronics, a signal is often a time-varying voltage that is also an electromagnetic wave carrying information, though it can take on other forms, such as current.
There are two main types of signals used in electronics: analog and digital signals. This article discusses the corresponding characteristics, uses, advantages and disadvantages, and typical applications of analog vs.
An analog signal is time-varying and generally bound to a range e. In an electrical signal, the voltage, current, or frequency of the signal may be varied to represent the information.
Analog signals are often calculated responses to changes in light, sound, temperature, position, pressure, or other physical phenomena. When plotted on a voltage vs.
There should not be any discrete value changes see Figure 1. A digital signal is a signal that represents data as a sequence of discrete values. A digital signal can only take on one value from a finite set of possible values at a given time. With digital signals, the physical quantity representing the information can be many things:. Digital signals are used in all digital electronics, including computing equipment and data transmission devices. Most of the fundamental electronic components — resistors, capacitors, inductors, diodes, transistors, and operational amplifiers op amps — are all inherently analog components.
Circuits built with a combination of these components are analog circuits see Figure 3. Analog circuits can be complex designs with multiple components, or they can be simple, such as two resistors that form a voltage divider. In general, analog circuits are more difficult to design than digital circuits that accomplish the same task.
It would take a designer who is familiar with analog circuits to design an analog radio receiver, or an analog battery charger, since digital components have been adopted to simplify those designs. Small changes in the voltage level of an analog signal can produce significant errors when being processed. Analog signals are commonly used in communication systems that convey voice, data, image, signal, or video information using a continuous signal. There are two basic kinds of analog transmission, which are both based on how they adapt data to combine an input signal with a carrier signal.
The two techniques are amplitude modulation and frequency modulation. Amplitude modulation AM adjusts the amplitude of the carrier signal. Frequency modulation FM adjusts the frequency of the carrier signal. Analog transmission may be achieved via many methods:. Much like the human body uses eyes and ears to capture sensory information, analog circuits use these methodologies to interface with the real world, and to accurately capture and process these signals in electronics.
Digital circuits implement components such as logic gates or more complex digital ICs. Such ICs are represented by rectangles with pins extending from them see Figure 4. Digital circuits commonly use a binary scheme. Although data values are represented by just two states 0s and 1s , larger values can be represented by groups of binary bits. For example, in a 1-bit system, a 0 represents a data value of 0, and a 1 represents a data value of 1.
However, in a 2-bit system, a 00 represents a 0, a 01 represents a 1, a 10 represents a 2, and a 11 represents a 3. In a bit system, the largest number that can be represented is , or 65, These groups of bits can be captured either as a sequence of successive bits or a parallel bus.
This allows large streams of data to be processed easily. Unlike analog circuits, most useful digital circuits are synchronous, meaning there is a reference clock to coordinate the operation of the circuit blocks, so they operate in a predictable manner. Analog electronics operate asynchronously, meaning they process the signal as it arrives at the input. Most digital circuits use a digital processor to manipulate the data. This can be in the form of a simple microcontroller MCU or a more complex digital signal processor DSP , which can filter and manipulate large streams of data such as video.
Digital signals are commonly used in communication systems where digital transmission can transfer data over point-to-point or point-to-multipoint transmission channels, such as copper wires, optical fibers, wireless communication media, storage media, or computer buses.
The transferrable data is represented as an electromagnetic signal, such as a microwave, radio wave, electrical voltage, or infrared signal. In general, digital circuits are easier to design, but they often cost more than analog circuits that are intended for the same tasks. Many systems must process both analog and digital signals. It is common in many communications systems to use an analog signal, which acts as an interface for the transmission medium to transmit and receive information.
These analog signals are converted to digital signals, which filter, process, and store the information. Figure 5 shows a common architecture in which the RF analog front-end AFE consists of all analog blocks to amplify, filter, and gain the analog signal.
Meanwhile, the digital signal processor DSP section filters and processes the information. To convert signals from the analog subsystem to the digital subsystem in the receive path RX , an analog-to-digital converter ADC is used. To convert signals from the digital subsystem to the analog subsystem in the transmit path TX , a digital-to-analog converter DAC is used.
A digital signal processor DSP is a specialized microprocessor chip that performs digital signal processing operations. DSPs are fabricated on MOSFET integrated circuit chips, and are widely used in audio signal processing, telecommunications, digital image processing, high-definition television products, common consumer electronic devices such as mobile phones, and in many other significant applications.
A DSP is used to measure, filter, or compress continuous real-world analog signals. Dedicated DSPs often have higher power efficiency, making them suitable in portable devices due to their power consumption constraints. A majority of general-purpose microprocessors are also able to execute digital signal processing algorithms.
An ADC with a higher resolution will have finer step sizes, and will more accurately represent the input analog signal. The last stage of the ADC encodes the digitized signal into a binary stream of bits that represents the amplitude of the analog signal.
The digital output can now be processed in the digital domain. A DAC provides the reverse operation. The DAC input is a binary stream of data from the digital subsystem, and it outputs a discrete value, which is approximated as an analog signal. As the resolution of the DAC increases, the output signal more closely approximates a true smooth and continuous analog signal see Figure 7.
There is usually a post filter in the analog signal chain to further smooth out the waveform. As with most engineering topics, there are pros and cons for both analog and digital signals. The specific application, performance requirements, transmission medium, and operating environment can determine whether analog or digital signaling or a combination should be used. Advantages to using digital signals, including digital signal processing DSP and communication systems, include the following:.
Disadvantages to using digital signals, including digital signal processing DSP and communication systems, include the following:. Advantages to using analog signals, including analog signal processing ASP and communication systems, include the following:. Disadvantages to using analog signals, including analog signal processing ASP and communication systems, include the following:. Traditional audio and communication systems used analog signals.
However, with advances in silicon process technologies, digital signal processing capabilities, encoding algorithms, and encryption requirements — in addition to increases in bandwidth efficiencies — many of these systems have become digital. They are still some applications where analog signals have legacy use or benefits.
Most systems that interface to real-world signals such as sound, light, temperature, and pressure use an analog interface to capture or transmit the information. A few analog signal applications are listed below:. Although many original communication systems used analog signaling telephones , recent technologies use digital signals because of their advantages with noise immunity, encryption, bandwidth efficiency, and the ability to use repeaters for long-distance transmission.
A few digital signal applications are listed below:. This article introduces some of the basic concepts of analog and digital signals, and their uses in electronics.
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Difference Between Analog and Digital Signal
Analog and Digital are the different forms of signals. Signals are used to carry information from one device to another. Analog signal is a continuous wave that keeps on changing over a time period. Digital signal is discrete in nature. The fundamental difference between analog and digital signal is that analog signal is represented by the sine waves whereas, the digital signal is represented by square waves. Lets us learn some more differences between analog and digital signal with the help of comparison chart shown below.
Analog Signals. To say a signal is analog simply means that the signal is continuous in time and amplitude. Take, for example, your standard mercury glass.
A signal is an electromagnetic or electrical current that is used for carrying data from one system or network to another. The signal is a function that conveys information about a phenomenon. In electronics and telecommunications, it refers to any time-varying voltage that is an electromagnetic wave which carries information.
Key Differences Between Analog and Digital Signal
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