Spectrum analyzer can be divided into two types: real-time analysis and sweep. Next, we briefly introduce the working principle of real-time spectrum analyzer.
Real time spectrum analyzer: the principle of operation is to convert the analog signal to digital signal, then add it to the digital filter. An orthogonal digital local oscillator controlled by a central processor generates a digital local oscillator signal which varies according to the sine law and varies according to the cosine law.
Orthogonal digital local oscillator is a sweep oscillator, when the frequency and the frequency of the measured signal at the same time there is output, after the integration of the results obtained for the oscilloscope display spectrum graphics.