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SRW150 Datasheet(PDF) 5 Page - TEMEX

Part No. SRW150
Description  Ultra Low Noise 500 MHz SAW Oscillators
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Maker  TEMEX [TEMEX]
Homepage  http://www.temex.com
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SRW150 Datasheet(HTML) 5 Page - TEMEX

   
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SR W150
Ultra Low Noise 500 MHz SAW Oscillators
Preliminary specification (Rev -)
January 8th, 2007
TEMEX reserves the right to modify herein specifications and informations at any time when necessary to provide optimum performance and cost.
4
S A W P r o d u c t s
Typical application 1: SR W150 phase locked on low frequency ULN XO
Crystal oscillators (XOs) are the state-of-the-art of ultra low noise frequency sources below 150 MHz.
For higher frequency applications, frequency multiplication of XOs remains the best solution for close to the carrier
noise. On the other hand, this is not true for the noise floor which has been degraded by the multiplication factor. High
frequency fundamental mode oscillators may achieve a better noise floor. This is the case for ULN SAW oscillators.
In frequency range 300 to 700 MHz, the best phase noise is obtained by “filtering” the noise floor of a multiplied XO by a
PLL build around an ULN VCSO with a loop bandwidth of about one kHz, as shown hereafter on two typical examples.
Block diagram
H(p)
x N
XO
SR W1xx
PLL
Frequency
Output
Benefits
1. Frequency stability :
the output frequency is the frequency of the XO multiplied by N
the long term relative performances are those of the XO
2. Phase noise improvement :
Within the PLL bandwidth, the phase noise is the phase noise of the XO + 20 logN
Out of the PLL bandwidth, the phase noise is the phase noise of the ULN VCSO
Typical example: SR W150 phase locked on a XO @ 100 MHz multiplied by 5
-180
-170
-160
-150
-140
-130
-120
-110
-100
-90
-80
-70
1E+1
1E+2
1E+3
1E+4
1E+5
1E+6
Frequency offset (Hz)
XO 100 MHz
XO x 5
SR W150 Free running
SR W150 Phase locked
Phase noise tracking
within PLL bandwidth
Phase noise suppression


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