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Signal is an electromagnetic wave that carries information through physical medium. Here the data is converted into electromagnetic signal either as analog or digital and sent from sender to receiver.Voltage and current are few time varying quantities that are used to represent data, by varying these quantities with respect to time data can be transmitted. Similarly signal is also represented as the function of the frequency domain rather than time domain.
Analog signal is a form of electrical energy (voltage, current or electromagnetic power) for which there is a linear relationship between electrical quantity and the value that the signal represents.The signal whose amplitude takes any value in a continuous range is called analog signal.Analog Signals are continuous in nature which vary with respect to time. They can be periodic or non-periodic.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'instrumentationtools_com-box-4','ezslot_6',165,'0','0'])};__ez_fad_position('div-gpt-ad-instrumentationtools_com-box-4-0');Voltage, current, frequency, pressure, sound, light, temperature are the physical variables that are measured with respect to their changes with respect to time to obtain information.
When voltage versus time graph is plotted we see curve with continuous values like sine waves.These signals are more subjected to noise as they travel through the medium, these noises result in information loss in the signal. Analog to digital converter converts analog signal to digital signal by a process called sampling and quantization. Sound waves are converted to sequence of samples by the process SamplingExamples of analog signals:
Conventional (old) transmitters, transducers convey data in analog mode.The signals include audio signals transmitted through wires, video signals broadcasted using older technology, radio signals, and analog watches.Digital SignalsThe signal, whose amplitude takes only limited values is called Digital signal.Digital signal are discrete, they contain only distinct values.
Digital signals carry binary data i.e. 0 or 1 in form of bits, it can only contain one value at a period of time. Digital signals are represented as square waves or clock signals.The minimum value is 0 volts whereas maximum value is 5 volts.Digital signals are less subjected to noise compared to analog signal.Transmission of digital data in analog channel is done by process called Modulation.
Welcome to Blaauw Lab! Below, we hope to give you a quick overview of the exciting research we are doing, ranging from low power RF, analog mixed-signal and digital circuits, to millimeter-sensors and embedded systems. We are always looking for talented PhD applicants. If you find one of the topics below interesting, feel free to apply to our graduate program and mention our lab in your application.
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