BDTIC

BF P410
BDTIC
In ves ti gat i on o f P ha s e N oi s e i n K uBan d DR Os us i ng BF P410
Phas e noi s e pe rfo r ma nc e vs .
c ol l ec to r c urre nt
Appl i c ati o n N ote A N 235
Revision: Rev. 1.0
2010-08-11
RF and P r otec ti on D evi c es
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BDTIC
Edition 2010-08-11
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BFP410
BFP410 Phase Noise in DROs
Application Note AN235
Revision History: 2010-08-11
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Application Note AN235, Rev. 1.0
3 / 12
2010-08-11
BFP410
BFP410 Phase Noise in DROs
List of Content, Figures and Tables
Table of Content
1
1.1
Overview ............................................................................................................................................. 5
Test Setup ............................................................................................................................................ 6
2
Test Results ........................................................................................................................................ 7
Author ................................................................................................................................................ 11
List of Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Flicker Noise Performance of BFP410 ................................................................................................. 5
Setup for Measuring Phase Noise. ...................................................................................................... 6
7
8
Phase Noise at 7.5 mA – logarithmic plot ............................................................................................ 8
Phase Noise at 9 mA – logarithmic plot ............................................................................................... 9
Phase Noise at 11 mA – logarithmic plot ............................................................................................. 9
Phase Noise at 14 mA – logarithmic plot ........................................................................................... 10
Phase Noise at 20 mA – logarithmic plot ........................................................................................... 10
BDTIC
List of Tables
Table 1
Phase Noise vs. DC current and offset frequency ............................................................................... 7
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Application Note AN235, Rev. 1.0
4 / 12
2010-08-11
BFP410
BFP410 Phase Noise in DROs
Overview
1
Overview
This application note shows how different DC supply currents affect the phase noise of a DRO.
One parameter strongly affecting the phase noise performance is the flicker noise (1/f - noise) of the transistor
used as the active element in the oscillator circuit. Other parameters are loaded Q of the resonator or the Noise
Factor F, for example.
Figure 1 shows the 1/f-noise of Infineon’s BFP410 bipolar transistor for different collector currents over
frequency. It can clearly be seen that reducing the collector current results in lower 1/f-noise.
The question that led to this application note was how much will the phase noise performance of a DRO
improve when the current consumption of the transistor is reduced.
BDTIC
BFP410 1/f-noise
(VCE=3V, RG=2kΩ,
Ω, TA=25°C, IC: Parameter)
50
45
5 mA
10 mA
40
15 mA
35
20 mA
NF [dB]
30
25
20
15
10
5
0
10
100
1000
10000
100000
f [Hz]
Figure 1
Flicker Noise Performance of BFP410
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Application Note AN235, Rev. 1.0
5 / 12
2010-08-11
BFP410
BFP410 Phase Noise in DROs
Overview
1.1
Test Setup
The current consumption of BFP410 in the LNB that was used for testing was changed by modifiying the values
of the biasing resistors. Current consumption was calculated by checking the voltage drop over a resistor
connecting from Vcc to the transistor’s collector.
A block diagram of the test setup that was used for measuring phase noise is displayed in the next picture.
The LNB was powered with a standard lab DC source. All components on the LNB were running as they would
do in normal operation when receiving satellite signals.
The signal of the 9.75 GHz DRO was monitored using a horn antenna. The signal couples through the closed
cover of the LNB. Having the cover open would have extremely affected the behavior of the LNB. But even with
closed lid the DRO’s signal was strong enough to be easily detected.
BDTIC
A RF amplifier was used to boost signal strength so there was enough dynamic range to perform the actual
phase noise measurement with a spectrum analyzer.
Figure 2
Setup for Measuring Phase Noise.
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Application Note AN235, Rev. 1.0
6 / 12
2010-08-11
BFP410
BFP410 Phase Noise in DROs
Test Results
2
Test Results
The following pages show the results of the phase noise measurements at different currents.
It can be seen that there is a phase noise minimum when adjusting the collector current to about 11 mA.
Furtherly reducing the current results again in increasing phase noise figures.
Table 1
Phase Noise vs. DC current and offset frequency
Phase Noise / (dBc/Hz) at offset frequency of:
DC current / mA
7.5
1 kHz
9
11
10 kHz
100 kHz
BDTIC
-72.8
-98.6
-107.9
-75.3
-99.1
-109.5
-78.4
-100.3
-109.7
14
-74.8
-98.8
-110.3
20
-66.7
-94.1
-110.0
Phase Noise vs. Offset Frequency
-60
-70
Phase Noise / (dBc/Hz)
-80
20mA
-90
14mA
11mA
9mA
7.5mA
-100
-110
-120
1
10
100
Offset Frequency / kHz
Figure 3
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Application Note AN235, Rev. 1.0
7 / 12
2010-08-11
BFP410
BFP410 Phase Noise in DROs
Test Results
Phase Noise vs. Current
-65
-70
-75
Phase Noise / (dBc/Hz)
-80
-85
-90
1kHz
10kHz
-95
100kHz
BDTIC
-100
-105
-110
-115
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Icc / mA
Figure 4
Figure 5
Phase Noise at 7.5 mA – logarithmic plot
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Application Note AN235, Rev. 1.0
8 / 12
2010-08-11
BFP410
BFP410 Phase Noise in DROs
Test Results
BDTIC
Figure 6
Phase Noise at 9 mA – logarithmic plot
Figure 7
Phase Noise at 11 mA – logarithmic plot
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Application Note AN235, Rev. 1.0
9 / 12
2010-08-11
BFP410
BFP410 Phase Noise in DROs
Test Results
BDTIC
Figure 8
Phase Noise at 14 mA – logarithmic plot
Figure 9
Phase Noise at 20 mA – logarithmic plot
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Application Note AN235, Rev. 1.0
10 / 12
2010-08-11
BFP410
BFP410 Phase Noise in DROs
Author
Author
Dietmar Stolz, Staff Engineer of Business Unit “RF and Protection Devices”
BDTIC
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Application Note AN235, Rev. 1.0
11 / 12
2010-08-11
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AN235