Ap pl ica t io n N o te, Re v. 1 . 2, F e br ua ry 2 00 8
A p p li c a t i o n N o t e N o . 1 5 4
E S D - H a r d e n e d B F P 4 6 0 R F T r a n s i s t or i n a L o w
C o s t 4 3 4 M H z L N A + B a n dp a s s F i lt e r A p p l i c a ti o n
R F & P r o t e c ti o n D e v i c e s
Edition 2008-02-26
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2009.
All Rights Reserved.
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ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION. INFINEON TECHNOLOGIES HEREBY
DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND (INCLUDING WITHOUT
LIMITATION WARRANTIES OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF ANY
THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE.
Information
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Application Note No. 154
Application Note No. 154
Revision History: 2008-02-26, Rev. 1.2
Previous Version: 2006-12-14, Rev. 1.1
Page
Subjects (major changes since last revision)
All
Small changes in figure descriptions
Application Note
3
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
1
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA
+ Bandpass Filter Application
Applications
LNA + Filter for Set Top Box (STB) to improve sensitivity / range of wireless remote-control.
Overview
The ESD-Hardened BFP460 Transistor with 1500 V Human Body Model ESD rating is shown in a low-cost,
broadband LNA + 434 MHz Bandpass Filter circuit. The LNA is unconditionally stable from 5 MHz to 8 GHz, and
is optimized for wide bandwidth, ease-of-use & low cost – only resistors & capacitors used – no coils needed for
the LNA. The optional bandpass filter is a “top C coupled” configuration using 5 capacitors and 2 inductors. The
filter may be bypassed and each block (LNA and filter) may be tested separately. The LNA block is usable from
under 200 MHz to over 1 GHz inclusive.
Target Specification, 434 MHz
Gain 15 dB min.; NF < 2 dB; OP1dB +5 dBm min.; I = 10 mA max.
Summary of Results
T = 25 °C, network analyzer power ~ -30 dBm, VS = 5.0 V, VCE = 3.1 V, I =9.7 mA.
Table 1
LNA Only
Freq.
MHz
dB [s11]² dB [s21]² DB
[s12]²
DB
[s22]²
NF* IIP3
OIP3
dB
dBm
dBm
dBm
dBm
105
20.5
19.7
24.9
13.5
---
---
---
---
---
FM broadcast
315
16.9
19.1
24.6
14.4
1.4
---
---
---
---
RKE frequency
434
15.0
18.6
24.3
14.9
1.4
-7.6
+11.0
-17.0
+0.6
Desired fC
800
12.0
18.6
23.2
16.1
1.5
---
---
---
---
Cellular band
IP1dB
OP1dB
Comments
Table 2
IP1dB
OP1dB
Comments
Bandpass Filter Only
Freq.
MHz
dB [s11]² dB [s21]² dB [s12]² dB [s22]² NF* IIP3
dB dBm
OIP3
dBm
dBm
dBm
105
0.1
-82.0
---
0.1
---
---
---
---
---
FM broadcast
315
0.1
-26.2
---
0.1
---
---
---
---
---
RKE frequency
434
13.0
-2.4
---
14.0
---
---
---
---
---
Desired fC
800
0.1
-25.9
---
0.1
---
---
---
---
---
Cellular band
OIP3
IP1dB
OP1dB
Comments
dBm
dBm
dBm
Table 3
Freq.
MHz
Cascade of LNA + Bandpass Filter
dB [s11]² dB [s21]² dB [s12]² dB [s22]² NF* IIP3
dB dBm
105
5.9
-62.1
88.0
0.1
---
---
---
---
---
FM broadcast
315
7.7
-7.3
50.9
0.1
---
---
---
---
---
RKE frequency
434
11.5
15.7
27.1
11.9
1.4
---
---
---
---
Desired fC
800
13.0
-9.0
48.8
0.1
---
---
---
---
---
Cellular band
* Note that PCB loss is not extracted. If PCB loss were extracted, NF would be approximately 0.2 dB lower.
Application Note
4
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Block Diagram
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Application Note
5
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Schematic Diagram
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Application Note
6
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Scanned Image of PC Board
Figure 4
Image of PC Board
Application Note
7
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Scanned Image of PC Board, Close-In Shot.
Figure 5
Image of PC Board, Close-In Shot
Application Note
8
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Noise Figure, Plot, 225 to 945 MHz, LNA alone. Center of Plot (x-axis) is 585 MHz.
Figure 6
Noise Figure, LNA alone
Application Note
9
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Noise Figure, Tabular Data, LNA alone
From Rohde & Schwarz FSEK3 + FSEM30 + System PreAmp
Table 4
Noise Figure, LNA alone
Frequency
Noise Figure
225 MHz
1.38 dB
255 MHz
1.40 dB
285 MHz
1.39 dB
315 MHz
1.41 dB
345 MHz
1.42 dB
375 MHz
1.42 dB
405 MHz
1.41 dB
435 MHz
1.41 dB
465 MHz
1.43 dB
495 MHz
1.43 dB
525 MHz
1.44 dB
555 MHz
1.47 dB
585 MHz
1.47 dB
615 MHz
1.46 dB
645 MHz
1.48 dB
675 MHz
1.49 dB
705 MHz
1.51 dB
735 MHz
1.47 dB
765 MHz
1.48 dB
795 MHz
1.51 dB
825 MHz
1.51 dB
855 MHz
1.53 dB
885 MHz
1.56 dB
915 MHz
1.57 dB
945 MHz
1.55 dB
Application Note
10
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Gain Compression, LNA alone, at 434 MHz, VS = 5.0 V, VCE = 3.1 V, I = 9.7 mA, T = 25 °C
Amplifier is checked for 1 dB compression point. An Agilent power meter was used to ensure accurate power
levels are measured (as opposed to using Vector Network Analyzer in "Power Sweep" mode).
Output P1dB ≅ +17.0 dBm; Input P1dB ≅ +17.0 dBm + (Gain - 1 dB) = +17.0 dBm + 17.6 dB = +0.6 dBm
Note gain compression performance can be improved by using an inductor as an RF Choke, in place of resistor
R3. But resistor was used as a low-cost Choke to reduce cost.
Table 5
Gain Compression of LNA alone
PIN, dBm
Gain, dB
-26.0
18.6
-25.0
18.6
-24.0
18.5
-23.0
18.4
-22.0
18.3
-21.0
18.2
-20.0
18.1
-19.0
18.0
-18.0
17.8
-17.0
17.6
-16.0
17.3
-15.0
16.9
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Figure 7
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Plot of Gain Compression, LNA alone
Application Note
11
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Stability. LNA alone
Rohde and Schwarz ZVC Network Analyzer calculates and plots Stability Factor K in real time, from 5 MHz to
8 GHz. Note K>1 over entire range ⇒ showing unconditional stability.
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Figure 8
Plot of K(f) for LNA alone
Application Note
12
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Third Order Intercept Point, LNA alone
Input Stimulus: f1 = 433 MHz, f2 = 434 MHz, -29 dBm each tone.
Input IP3 = -29 + (42.9 / 2) = -7.6 dBm
Output IP3 = -7.6 dBm + 18.6 dB gain = +11.0 dBm
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Figure 9
Plot of Tow-Tone Test, LNA alone
Application Note
13
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Input Return Loss, Log Mag, LNA alone
25 MHz - 3 GHz Sweep
Note wideband design
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Figure 10
Plot of Input Return Loss, LNA alone
Application Note
14
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Input Return Loss, Smith Chart, LNA alone
Reference Plane = Input SMA Connector on PC Board
25 MHz - 3 GHz Sweep
Note wideband design
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Figure 11
Smith Chart of Input Return Loss, LNA alone
Application Note
15
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Forward Gain, LNA alone
25 MHz - 3 GHz Sweep
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Figure 12
Plot of Forward Gain, LNA alone
Application Note
16
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Reverse Isolation, LNA alone
25 MHz - 3 GHz
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Figure 13
Plot of Reverse Isolation, LNA alone
Application Note
17
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Output Return Loss, Log Mag, LNA alone
25 MHz - 3 GHz Sweep
Note wideband design
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Figure 14
Plot of Output Return Loss, LNA alone
Application Note
18
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Output Return Loss, Smith Chart, LNA alone
Reference Plane = Input SMA Connector on PC Board
25 MHz - 3 GHz Sweep
Note wideband design
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Figure 15
Smith Chart of Output Return Loss, LNA alone
Application Note
19
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Input Return Loss, Log Mag, 434 MHz Bandpass Filter only
25 MHz - 3 GHz Sweep
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Figure 16
Plot of Input Return Loss, BPF alone
Application Note
20
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Insertion Loss, 434 MHz Bandpass Filter only
25 MHz - 3 GHz Sweep
Note rejection in FM broadcast band & cellular band
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Figure 17
Plot of Insertion Loss, BPF alone
Application Note
21
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Output Return Loss, Log Mag, 434 MHz Bandpass Filter only
25 MHz - 3 GHz Sweep
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Figure 18
Plot of Output Return Loss, BPF alone
Application Note
22
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Noise Figure, Plot, 384 to 484 MHz, LNA + 434 MHz Filter. Center of Plot (x-axis) is 434 MHz.
Figure 19
Noise Figure, LNA + BPF
Application Note
23
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Noise Figure, Tabular Data, LNA + 434 MHz Bandpass Filter
From Rohde & Schwarz FSEK3 + FSEM30 + System PreAmp (Miteq SMC-02)
Table 6
Noise Figure, Cascade
Frequency
Noise Figure
384 MHz
1.41 dB
389 MHz
1.42 dB
394 MHz
1.38 dB
399 MHz
1.40 dB
404 MHz
1.37 dB
409 MHz
1.38 dB
414 MHz
1.39 dB
419 MHz
1.42 dB
424 MHz
1.39 dB
429 MHz
1.40 dB
434 MHz
1.40 dB
439 MHz
1.38 dB
444 MHz
1.41 dB
449 MHz
1.41 dB
454 MHz
1.44 dB
459 MHz
1.43 dB
464 MHz
1.49 dB
469 MHz
1.53 dB
474 MHz
1.53 dB
479 MHz
1.56 dB
484 MHz
1.61 dB
Application Note
24
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Input Return Loss, Log Mag, LNA + 434 MHz Bandpass Filter
25 MHz - 3 GHz Sweep
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Figure 20
Plot of Input Return Loss, Cascade
Application Note
25
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Input Return Loss, Smith Chart, LNA + 434 MHz Bandpass Filter
Reference Plane = Input SMA Connector on PC Board
25 MHz - 3 GHz Sweep
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Figure 21
Smith Chart of Input Return Loss, Cascade
Application Note
26
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Forward Gain, LNA + 434 MHz Bandpass Filter
25 MHz - 3 GHz Sweep
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Figure 22
Plot of Forward Gain, Cascade
Application Note
27
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Reverse Isolation, LNA + 434 MHz Bandpass Filter
25 MHz - 3 GHz
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Figure 23
Plot of Reverse Isolation, Cascade
Application Note
28
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Output Return Loss, Log Mag, LNA + 434 MHz Bandpass Filter
25 MHz - 3 GHz Sweep
&+ 6
G%
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0+]
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$1BSORWBRXWSXWBUHWXUQBORVVBFDVFDGHYVG
Figure 24
Plot of Output Return Loss, Cascade
Application Note
29
Rev. 1.2, 2008-02-26
Application Note No. 154
ESD-Hardened BFP460 RF Transistor in a Low Cost 434 MHz LNA + Bandpass
Output Return Loss, Smith Chart, LNA + 434 MHz Bandpass Filter
Reference Plane = Input SMA Connector on PC Board
25 MHz - 3 GHz Sweep
&+ 6
8
M
0+]
/1$),/7(5
P M 0+]
M
0+]
P M 0+]
&$,
2)6
&3/
),/
N
67$57
0+]
'DWH
'(&
602
6723 *+]
$1BVPLWKBRXWSXWBUHWXUQBORVVBFDVFDGHYVG
Figure 25
Smith Chart of Output Return Loss, Cascade
Application Note
30
Rev. 1.2, 2008-02-26