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HMC703LP4E Datasheet, PDF (6/58 Pages) Hittite Microwave Corporation – 8 GHZ FRACTIONAL SYNTHESIZER
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v02.0813
HMC703LP4E
8 GHz fractional synthesizer
Figure 13. Typical Phase Noise & Spur
Performance at 8 GHz + 200 kHz[3]
-60
Figure 14. Fractional Performance, Exact
Frequency Mode On at 8013.6 MHz [4]
-80
-80
-100
-120
-140
-160
-100
-120
-140
-160
-180
102
103
104
105
106
107
108
OFFSET(Hz)
Figure 15. Integer Boundary Spur at
8 GHz + 20 kHz vs. Charge Pump Offset[5]
-20
20 kHz Offset Spur
-30
10 kHz Offset Spur
Recommended
-40
Operating
Range
-50
-60
-70
-80
-90
-800 -600 -400 -200
0
200 400 600 800
CP OFFSET CURRENT (uA)
Figure 17. Modelled vs. Measured Phase
Noise, Integer Mode HiK at 8 GHz [7]
-80
-100
Total Noise Simulated Using
Hittite PLL Design Software
Modelled PLL Floor
-120
-140
Measured Total Noise
-180
102
103
104
105
106
107
108
OFFSET (Hz)
Figure 16. RF Input Limits [6]
30
20
10
0
No Divider
Divide By 2
-10
RECOMMENDED OPERATING RANGE
-20
-30
-40
0
2000
4000
6000
8000
10000
RF INPUT FREQUENCY AT PRESCALAR (MHz)
Figure 18. Modelled vs. Measured Phase
Noise, Fractional Mode B, HiK at ~ 8 GHz [8]
-80
-100
Total Noise Simulated Using
Hittite PLL Design Software
Modelled PLL Floor
-120
-140
Measured Total Noise
-160
INTEGRATED RMS JITTER = 36.1 fs
100 Hz to 100 MHz
-160
INTEGRATED RMS JITTER = 44.2 fs
100 Hz to 100 MHz
-180
-180
102
103
104
105
106
107
108
102
103
104
105
106
107
108
OFFSET (Hz)
OFFSET (Hz)
[3] Output frequency = 8 GHz + 200 kHz using HMC508LP5E VCO, Reference Input = 100 MHz, PD frequency = 100 MHz, CP current = 2.5 mA,
Fractional Mode B, 20 kHz bandwidth Loop Filter. Spur at 200kHz due to RF signal at 8GHz + 200kHz, spur at 100kHz due to prescaler input at
4GHz+100kHz. Reference feedthrough spur at 100 MHz offset.
[4] Exact Frequency Mode channel spacing 100 kHz, Fractional N, Rfout = 8013.6 MHz using HMC508LP5E VCO, Reference Input = 100 MHz, PD
frequency = 100 MHz, Prescaler divide-by-2 selected. 20 kHz Loop Filter bandwidth, reference feedthrough spur at 100 MHz offset.
[5] Tuned to 8 GHz + 20 kHz, Prescaler at 4 GHz + 10 kHz, Loop bandwidth >> 20 kHz, Reference Frequency 50 MHz. Offset polarity should be
positive for inverting configurations and negative otherwise.
[6] Low frequency minimum power levels not characterized. Low frequency limitation is only a function of external AC coupling capacitance signal
slew rate.
[7] HiK integer mode measured at 8 GHz, Prescalar at 4 GHz, 50 MHz reference frequency.
[8] Active Fractional B Mode (Prescalar @ 4 GHz + 2.5 kHz), Reference Frequency 50 MHz.
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