# Spectrum analyzer and vector signal analyzer

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- source:TECHEN CNC Machining

Bandwidth of 7GHz; base band- - 36MHz; of bandwidth of 40MHz; intermediate frequency leads resolution- - 0.

001HZ; time base accuracy- - 0.

2ppm/ year; Phasic noise- - 97dBc/Hz (100Hz of carrier wave deflection) , - 122dBc/Hz (1khz of carrier wave deflection) extent limits - 45-+20dBm; Range accuracy- - losing 2dB; 3 rank intermodulation is lack fidelity---70dB. Using a field is frequency of satellite communications, enlarge jumps frequency communication, dot arrives bit of communication, and frequency monitoring and search. Divide site with the code of mobile (CDMA) for, use the analytic software of form a complete set, can obtain: The change that the power of power of average carrier wave of catapult follows time is phasic the modulation precision close quarters that compares pseudo-random noise alignment with power of channel of frequency error vicinity sends spectrum of unripe emissive frequency to measure measure with weaveform in wireless base the product of station or mobile telephone is developed, vector signal analyzer can press a variety of industry standards, the catapult that waits to GSM, CDMA and mobile phone undertake strict precision and dynamic limits are measured. In the communication product production such as CDMA, use only be being measured continuously is insufficient, use digital modulation signal to be able to measure an output conveniently power and lack fidelity wait for important parameter. Vector signal analyzer adopts Windows platform, personal computer is received to have data processing and trade outside be being passed easily, windows platform facilitating function upgrades and use other project to design a tool, the graphical interface that be familiar with can shorten study time, more time undertake put apart measure and use all sorts of designs and test tool. The spectrum of digital memory oscillograph measures digital memory oscillograph (DSO) front is ADC commutation, have spectrum to analyse ability likewise consequently, the FFT module that passes standard or choose and buy obtains spectrum to analyse character. Should point out, DSO main characteristic is time domain is measured, the product of bandwidth 100MHz has the perpendicular resolution of 10 above, the product of bandwidth 500MHz has 8 resolution only, i.e. is in 12 under spectrum analyzer on resolution - 16. The preamplifier of DSO and attenuator introduce transient state lack fidelity, the chart wave noise that is low n is behaved easily on spectrum graph. Especially high frequency number is in memory oscillograph, it is used hand in folded ADC to raise sampling rate, for example the sampling rate of every ADC is 1Gs/s, two overlay rise the sampling rate that achieves 2Gs/s. This is the simple idea that raises effective bandwidth, but when with Yu Pin chart shows, the degree of linearity of each ADC, gain, frequency is answered and sampling times have a difference a bit, can hand in in sampling clock pulse spectrum introduces in folding sampling process lack fidelity, many the sampling pulse of a group of Fs/N, fs is basic sampling frequency here, n is to make folded ADC number. Oneself of this kind of circuit arises mix fold signal to be eliminated not easily with filter, when measuring high frequency signal with DSO, want to be in what appear on spectrum graph very carefully to mix fold information. For example, when the DSO that uses two afore-mentioned sampling to lead 1Gs/s ADC to form will observe 100MHz sine wave, can be in 900, false signal appears near 1100MHz. This shows, DSO observes time domain signal is best instrument, because false signal often appears after frequency domain commutation, when measuring spectrum character, must notice " eliminate the false and retain the true " . The frequency range of analyzer of brief summary spectrum is the widest, sensitivity is tall, very comfortable distributing at the frequency of communication equipment and link measure, defect is the amplitude that can obtain input signal only. Limits of frequency of vector signal analyzer is inferior, the characteristic that uses FFT can be obtained at the same time extent and phasic, particularly the first, 2, 3 acting mobile, include the measurement of beehive, GSM and CDMA equipment. CNC Milling CNC Machining