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The LNFR-400 is an ultra-low noise frequency reference.
The device can be used as a low noise source in
phase noise measurement systems. Other applications
include high stability frequency synthesizers, reference
frequency generation and frequency synthesis
chains for atomic standards. The LNFR-400
contains 5 MHz and 100 MHz ultra-low noise ovenized
oscillators. The outputs at
10 MHz, 20 MHz, 40 MHz and 80 MHz are obtained
by multiplying the signal from the 5 MHz oscillator.
The 100 MHz oscillator is phase
locked to the 5 MHz oscillator to provide a lower phase
noise signal inside the bandwidth of the phase-locked
loop. The output of the 100 MHz oscillator
is doubled to obtain 200 MHz and doubled
again to obtain 400 MHz. All outputs to the front
panel are buffered with low noise isolation amplifiers.
The LNFR-400 can be phase locked via a +/- 5 VDC tuning
signal or with a 5 MHz 1 VRMS signal. The synthesizer
is offered in a stand-alone rack-mount package. For
frequency synthesis chain applications the synthesizer
is available in modular form.
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| Features | Applications |
|---|
- External 5 MHz/DC tuning
- Low environmental sensitivity
- Ultra-low phase noise
- Very low spurious: -100 dBc
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- Atomic frequency standards
- Phase noise measurements
- Reference frequency generation
- Telecomunications standards
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| Specifications |
| Parameter | Conditions | Min | Typ | Max | Units |
|---|
| Output power | | +13 | +15 | - | dBm |
| Electrical tuning range | @ 5 MHz | +/-1 E-6 | - | - | - |
| Tuning port voltage | | - | +/-5 | - | VDC |
| Temperature Stability | @ 5 MHz, 10-40°C | - | +/-5 E-9 | - | - |
| Phase noise measured at 5 MHz | 1 Hz
10 Hz
100 Hz
>1 kHz | -
-
-
- | -118
-150
-167
-173 | -115
-145
-164
-171 | dBc/Hz |
| Phase noise measured at 10 MHz | 1 Hz
10 Hz
100 Hz
>1 kHz | -
-
-
-
- | -114
-142
-160
-168 | -111
-138
-156
-166 | dBc/Hz |
| Phase noise measured at 100 MHz | 10 Hz
100 Hz
1 kHz
>10 kHz | -
-
-
- | -120
-133
-155
-175 | -118
-129
-153
-174 | dBc/Hz |
| Phase noise measured at 400 MHz | 10 Hz
100 Hz
1 kHz
>10 kHz | -
-
-
- | -110
-120
-144
-163 | -106
-117
-141
-161 | dBc/Hz |
| Spurious | 5, 10 and 100 MHz | - | - | -110 | dBc |
| Harmonics | 5, 10 and 100 MHz | - | -40 | -35 | dBc |
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LNFR-400 Options
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Option -HS (High Stability Oven)
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A 5 MHz OCXO with a temperature stability of +/- E-9 for the temperature range of 10 to 40 °C
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Option -20, -40, -80, -200 Additional outputs at the specified frequency in MHz are supplied
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-20 20 MHz output at +13 dBm is provided.
-40 40 MHz output at +13 dBm is provided.
-80 80 MHz output at +13 dBm is provided.
-200 200 MHz output at +13 dBm is provided.
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