SPECTRUM ANALYZER AND DIGITAL STORAGE OS

SPECTRUM ANALYZER AND DIGITAL STORAGE OSCILOSCOPE : 

SPECTRUM ANALYZER AND DIGITAL STORAGE OSCILOSCOPE PRESENTED BY- SUMAN GAYEN SNIGHNENDU ANKAN BANDYOPADHYAY JOYDEEP VOUMIK

Spectrum analyzer : 

Spectrum analyzer A spectrum analyzer or spectral analyzer is a device used to examine the spectral composition of some electrical, acoustic, or optical waveform. It may also measure the power spectrum.

Types of Spectrum analyzer : 

Types of Spectrum analyzer Analog: An analog spectrum analyzer uses either a variable band-pass filter whose mid-frequency is automatically tuned (shifted, swept) through the range of frequencies of which the spectrum is to be measured or a superheterodyne receiver where the local oscillator is swept through a range of frequencies. Digital: A digital spectrum analyzer computes the discrete Fourier transform (DFT), a mathematical process that transforms a waveform into the components of its frequency spectrum.

Functions of Spectrum-analyzer : 

Functions of Spectrum-analyzer Frequency Marker/peak search Bandwidth/average Amplitude View/trace

Operations of Spectrum-analyzer : 

Operations of Spectrum-analyzer Choosing a wider bandpass filter will improve the signal-to-noise ratio at the expense of a decreased frequency resolution. a spectrum analyzer displays a power spectrum over a given frequency range, changing the display as the properties of the signal change. With Fourier transform analysis in a digital spectrum analyzer, it is necessary to sample the input signal with a sampling frequency νs that is at least twice the highest frequency that is present in the signal, due to the Nyquist limit.

Spectrums are shown in figure.. : 

Spectrums are shown in figure.. spectrum of a song is shown in figure.

Slide 7: 

frequency spectrum of the heating up period of a switching power supply

Acoustic uses : 

Acoustic uses Acoustic spectrogram of a young girl saying "Oh No". Tthe vertical axis represents linear frequency from 0 to 5.5 kHz, and the horizontal axis represents the passage of 700 milliseconds.

Name of Manufacturers : 

Name of Manufacturers 4Pockets Aaronia Agilent Technologies AirMagnet Anritsu Atten Electronics Aeroflex Avcom Of Virginia

Digital storage oscilloscope : 

Digital storage oscilloscope The digital storage oscilloscope, or DSO for short, is now the preferred type for most industrial applications, although simple analog CROs are still used by hobbyists. It replaces the unreliable storage method used in analog storage scopes with digital memory, which can store data as long as required without degradation. It also allows complex processing of the signal by high-speed digital signal processing circuits.

Continued.... : 

Continued.... Digital oscilloscopes are limited principally by the performance of the analog input circuitry and the sampling frequency. In general, the sampling frequency should be at least the Nyquist rate, double the frequency of the highest-frequency component of the observed signal, otherwise aliasing may occur. Digital storage oscilloscopes also make it possible to capture, record, and broadcast the image, making them useful for collaborative projects and computerized analysis.[7]

A digital storage oscilloscope manufactured by Agilent Technologies : 

A digital storage oscilloscope manufactured by Agilent Technologies

So we can conclude that……….. : 

So we can conclude that……….. Spectrum analyzers are widely used to measure the frequency response, noise and distortion characteristics of all kinds of RF circuitry, by comparing the input and output spectra. In telecommunications, spectrum analyzers are used to determine occupied bandwidth and track interference sources. Cellplanners use this equipment to determine interference sources in the GSM/TETRA and UMTS technology.

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