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| U2731B Datasheet, PDF (23/25 Pages) ATMEL Corporation – DAB ONE- CHIP FRONT END | |||
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Figure 12. VCO Circuit
V Tune
C1VC
B2VC
B1VC
C2VC
V Bias
VS
U2731B
Phase-noise
Performance
(Example: SFeff = 16899, SFref,eff = 1120, fref = 17.92 MHz, IPD = 200 mA,
spectrum analysis: HP7000)
Figure 13. Phase-noise Over Frequency
10.00 dB/DIV
10.00 dB/DIV
< -70 dBc/Hz
CENTER 270.384 MHz
RB 100 Hz VB 100 Hz
SPAN 10.00 kHz
ST 3.050 sec
CENTER 270.384 MHz
RB 1.00 kHz VB 1.00 kHz
SPAN 200.0 kHz
ST 600.0 msec
23
4671CâDABâ06/04
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