SPECTRUM ANALYZER HAVING A RESOLUTION FILTER THAT CAN BE ADJUSTED VIA A PHASE-VARIATION PARAMETER

摘要

The invention relates to a spectrum analyzer (1) which comprises a mixer (3) which mixes the conjugate complex input signal v*(t) into a base band signal x(t), and a resolution filter (4) which narrow band-filters the base band signal x(t). According to the invention, the resolution filter (4) has the complex, discrete impulse response (I), wherein C1, C2 and C3 are constants, k is the scanning index, Ta is the scanning period, hallp(t) is the Fourier retransform of ejϕ(f), ϕ(f) is any phase response depending on the frequency in the transfer function of the resolution filter and k0 is a free variation parameter.