Patent ID: 8159280

Claim:
A noise generator for generating a band-limited noise: a memory to store respective digital samples of an in-phase (I) signal component and a quadrature (Q) signal component of a noise signal; respective digital-to-analog converters coupled to the memory to supply respective digital signals respectively corresponding to the in-phase (I) signal component and the quadrature (Q) signal component of the noise signal; and a vector modulator responsive to a carrier frequency to modulate in a baseband the respective digital signals respectively corresponding to the in-phase (I) signal component and the quadrature (Q) signal component of the noise signal, wherein the vector modulator generates a plurality of sinusoidal signals at a same level and equidistant frequency position in a noise spectrum, wherein the vector modulator is configured to determine a phase position for each individual sinusoidal signal of the plurality of sinusoidal signals according to φ k = 2 ⁢ π ⁢ ⁢ T START ⁢ k + π ⁢ ⁢ k 2 ⁡ ( T STOP - T START ) N + C ⁢ ⁢ π ⁡ ( k - N / 2 ) 4 ( N / ( T STOP - T START ) ) 2 wherein k represents the individual sinusoidal signal, N represents the plurality of sinusoidal signals, T STOP represents any desired value between 0 and 1, T START represents any desired value between 0 and 1, and wherein T STOP >T START , and C represents any desired positive value.