STW81103 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STW81103' PDF : 53 Pages View PDF
STW81103
Typical performance characteristics
3
Typical performance characteristics
Phase noise is measured with the Agilent E5052A Signal Source Analyzer. All closed-loop
measurements are done with FSTEP=200 kHz, with the FPFD and charge pump current
properly set. The loop filter configuration is depicted in Figure 36: Typical application
diagram, and the reference clock signal is at 76.8 MHz with a phase noise of -135 dBc/Hz
@1 kHz offset, -145 dBc/Hz @10 kHz offset and -149.5 dBc/Hz of noise floor.
Figure 3. VCO A (direct output) open loop
phase noise
Figure 4. VCO B (direct output) open loop
phase noise
Figure 5.
VCO A (direct output) closed loop
phase noise at 2.775 GHz
(FSTEP=200 kHz; FPFD=200 kHz;
ICP=2 mA)
Figure 6.
VCO B (direct output) closed loop
phase noise at 4.675 GHz
(FSTEP=200 kHz; FPFD=200 kHz;
ICP=3 mA)
1.0° rms
1.5° rms
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