CN-0232 Datasheet, PDF (3/6 Pages) Analog Devices – Minimizing Spurious Outputs Using a Synthesizer with an Integrated VCO and an External PLL Circuit

Circuit Note
R&S FSUP SIGNAL SOURCE ANALYZER
SETTINGS
RESIDUAL NOISE
(T1 WITHOUT SPURS)
SPUR LIST
SIGNAL FREQUENCY: 1.6000GHz
SIGNAL LEVEL: 5.44dBm
CROSS CORR MODE: HARMONIC 1
INTERNAL REF TUNED: INTERNAL PHASE DET
INT PHN (1.0k .. 30.0M): –49.1dBc 1.000MHz –83.82dBc
RESIDUAL PM: 0.285°
2.001MHz –99.68dBc
RESIDUAL FM: 3.24kHz 3.000MHz –89.92dBc
RMS JITTER: 0.4946ps 13.000MHz –94.70dBc
PHASE NOISE (dBc/Hz)
RF ATTEN: 5dB
TOP –70dBc/Hz
MARKER 1 (T1)
1kHz
–91.84dBc/Hz
–70
–80
1
–90
LOOP BW 300Hz
2
MARKER 2 (T1)
10.98633kHz
–93.42dBc/Hz
MARKER 3 (T1) MARKER 4 (T1)
13.00011MHz 26.00002MHz
–94.7dBc
–87.89dBc
4
3
–100
–110
–120
–130
–140
–150
–160
–170
1k
SPR OFF
TH 0dB
10k
100k
1M
FREQUENCY OFFSET (Hz)
Figure 2. ADF4350 PFD Spurs at 1.6 GHz
10M 30M
R&S FSUP SIGNAL SOURCE ANALYZER
SETTINGS
RESIDUAL NOISE
(T1 WITHOUT SPURS)
SPUR LIST
SIGNAL FREQUENCY: 1.6000GHz
SIGNAL LEVEL: 1.71dBm
CROSS CORR MODE: HARMONIC 1
INTERNAL REF TUNED: INTERNAL PHASE DET
INT PHN (1.0k .. 30.0M): –53.3dBc
RESIDUAL PM: 0.174°
RESIDUAL FM: 1.846kHz
RMS JITTER: 0.3025ps
1000.0kHz –90.44dBc
2.000MHz –85.60dBc
3.000MHz –96.36dBc
4.000MHz –99.28dBc
PHASE NOISE (dBc/Hz)
RF ATTEN: 5dB
TOP –70dBc/Hz
MARKER 1 (T1)
1kHz
–101.23dBc/Hz
–70
LOOP BW 300Hz
–80
12
–90
MARKER 2 (T1)
1kHz
–101.23dBc/Hz
MARKER 3 (T1) MARKER 4 (T1)
100kHz
1MHz
–120.62dBc
–144.68dBc
–100
–110
3
–120
–130
–140
4
–150
–160
–170
1k
10k
100k
1M
FREQUENCY OFFSET (Hz)
SPR OFF
TH 0dB
10M 30M
Figure 3. ADF4350 PFD Spurs at 1.6 GHz Using ADF4153 PLL
CN-0232
Rev. 0 | Page 3 of 6