Problem 4. Fig. 4 shows the phase noise at offset frequency f₁ and the level of the spur at offset frequency f₂ of the V

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Problem 4 Fig 4 Shows The Phase Noise At Offset Frequency F And The Level Of The Spur At Offset Frequency F Of The V 1 (49.9 KiB) Viewed 17 times

I'm a student who is studying RFIC with Razavi's textbook.
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Problem 4. Fig. 4 shows the phase noise at offset frequency f₁ and the level of the spur at offset frequency f₂ of the VCO output signal, Svco. When Svco goes through the divider with division a number of N, what would be the phase noise, level of the spur, f₁, and f₂? Please explain clearly and rationally. (Point: 20) VCO Syco SDN Divider (1/N) PN? →Spur? f₁ & f₂? VCO's output PN Spur = -100dBc PN = -100dBc/Hz Freq. fvco fvco+f₁ fvco+f2 Figure 4. Phase noise and the spur of a VCO