–100
–110
–120
–130
–140
–150
–160
10
100
1k
10k 100k
1M
10M 100M
FREQUENCY (Hz)
Figure 30. Additive (Residual) Phase Noise, CLK-to-CMOS @
250 MHz, Divide-by-4
–100
–110
–120
–130
–140
–150
–160
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
Figure 31. Phase Noise (Absolute) Clock Generation; Internal VCO @
1.475 GHz; PFD = 15.36 MHz; LBW = 40 kHz; LVPECL Output = 122.88 MHz
AD9520-4
–80
INTEGRATED RMS JITTER (12kHz TO 20MHz): 442 fS
–90
–100
–110
–120
–130
–140
–150
–160
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
Figure 32. Phase Noise (Absolute) Clock Cleanup; Internal VCO @ 1.552 GHz;
PFD = 19.44 MHz; LBW = 1.84 kHz; LVPECL Output = 155.52 MHz
–120
–130
–140
–150
–160
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
Figure 33. Phase Noise (Absolute), External VCXO (Toyocom TCO-2112)
@ 245.76 MHz; PFD = 15.36 MHz; LBW = 250 Hz; LVPECL Output = 245.76 MHz
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