AN049 - DECT Transmit - Receiver Switch Using Ultra Small PIN Diodes

A pp li c a t i o n N o t e , R e v . 2 . 0 , O c t . 2 00 6
A p p li c a t i o n N o t e N o . 0 4 9
DECT Transmit - Receiver Switch Using Ultra
Small PIN Diodes
R F & P r o t e c ti o n D e v i c e s
Edition 2006-10-11
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2009.
All Rights Reserved.
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Application Note No. 049
DECT Transmit - Receiver Switch Using Ultra Small PIN Diodes
Revision History: 2006-10-11, Rev. 2.0
Previous Version: 2000-07-28
Page
Subjects (major changes since last revision)
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Document layout change
Application Note
3
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
1
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
This application note covers a redesign of a PIN diode switch introduced in application note No. 007. It uses diodes
in SCD80 and SOT343 package, 0603 size SMD components and a 0.25 mm high FR4 printed circuit board.
Advantages
•
•
•
•
Small real estate consumption on PCB
Power consumption in transmit-mode only
Low component count
Low cost
Schematic
ANTENNA
BAR63
-02W
50Ω
λ/4
TX
47nH
RX
BAR81W
15pF
150pF
+U
I = +10mA for TX - Ant
U = 0 ... -5V or open circuit for RX - Ant
AN049_schematic.vsd
Figure 1
Schematic
Measured Data of Prototype Board
Table 1
Measured data f = 1.89 GHz
Transmit-state (I = +10 mA at +U-pin)
Receive-state (U = -3 V at +U-pin)
TX-Ant. Loss
0.47 dB
RX-Ant. Loss
0.70 dB
TX-RX Isolation
29.4 dB
TX-RX Isolation
19.8 dB
RX-Ant. Isolation
29.7 dB
TX-Ant. Isolation
18.5 dB
Due to the reduced width of a 50 Ω line on the thinner PCB material the losses are slightly higher than in
application note No. 007. Please note that TX-RX Isolation is improved by 3 dB in transmit-mode and more than
6 dB in receive-mode.
The applied -3 V at the +U control port for the small-signal measurement are not necessary in ‘real‘ operation. If
+U is left open circuit in receive-mode, a small reverse bias is generated by the diodes, if there is still an RF signal
from the transmitter.
Application Note
4
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
1.1
Harmonic Distortion Measurements
Measurement Setup
TX-Port
1.9 GHz, +27 dBm power, harmonics more than 100 dB down
RX-Port
50 Ω termination
Ant.-Port
Spectrum analyzer
+U-Pin
I = 5 mA and I = 10 mA
Results
Harmonics referred to TX-Port input level (+27 dBm):
3.8 GHz
-87 dB @ I = 5 mA
-92 dB @ I= 10 mA
5.7 GHz
> -100 dB @ I = 5 mA
> -100dB @ I = 10 mA
Note: All ports must be DC-blocked during measurements
Realization
A N049_evaluation_board.vsd
Figure 2
Evaluation Board
Board size: 35 mm x 30 mm, Scale: 3:1
The demo board was made of 0.25 mm FR4 Epoxy material
Application Note
5
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
Component placement
BAR63-02W
BAR81W
47nH
15pF
150pF
AN049_PCB_top_view.vsd
Figure 3
Top view on assembled PCB
Part list
Table 2
Part list
BAR81W
PIN diode
SOT343
Infineon
BAR63-02W
PIN diode
SCD80
Infineon
15 pF
Capacitor
0603
S+M
150 pF
Capacitor
0603
S+M
47 nH
Inductor
0603
S+M
FR4, 0.25 mm
Div.
Printed circuit board
Numeric computation
This circuit was developed using Microwave Harmonica V 7.0. To compute the frequency response of the circuit
the freely distributed S-Parameter files of the Infineon diodes were used. For the SMD inductor a simple parallel
equivalent circuit was developed.
Application Note
6
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
Circuit file for simulation
******************************************************************
* INFINEON SMALL SIGNAL SEMICONDUCTORS
* APPLICATION NOTE NO. 049
* DECT T/R-SWITCH WITH BAR81W/BAR63-02W
******************************************************************
*
ANT
*
PORT 2
*
O
*
|
*
|\ | | +---------------------+
*
TX O--| >|--O--|
LAMBDA/4
|------O-----O
RX
* PORT 1
|/ |
+---------------------+
|
PORT 3
*
BAR63
+-----+
*
-02W
\
/
*
BAR81W
\ /
*
---+--*
|
*
---+--- GND
* SUBSTRATE MATERIAL:
* FR4, H=0.25MM, T=0.018MM, ER=4.4, TAND=0.024
******************************************************************
* NOV. 1997
J.P. Schaffer
******************************************************************
AN049_sim ulation_file1.vsd
Figure 4
Simulation file 1
LL:
WAP:
W50:
WM:
PM:
18.3MM
0.46MM
0.46MM
0.20MM
0.50MM
; Width of match
; Length of match
BLK
STEP
1 43
TRL
43 44
STEP 44 45
TRL
45 60
OST
60
CAP
60
0
TWO
60 70
OST
70
CAP
70
0
TRL
80 81
VIA
81
TRL
80 82
VIA
82
TRL
70 71
STEP 71 72
TRL
72 73
STEP 73
2
S_OFF: 2POR
END
W1=WAP
W=WM
W1=WM
W=0.6MM
W=0.6MM
C=50fF
80 B81OF
W=0.6MM
C=50fF
W=1MM
D=0.5MM
W=1MM
D=0.5MM
W=0.6MM
W1=0.6MM
W=WM
W1=WM
1 2
W2=WM
P=PM
W2=0.6MM
P=0.4MM
P=0.4MM
P=0.4MM
P=1MM
p=1MM
P=0.8MM
W2=WM
P=PM
W2=W50
SUB
SUB
SUB
SUB
SUB
; BAR81W OFF STA
SUB
SUB
SUB
SUB
SUB
SUB
SUB
SUB
SUB
AN049_sim ulation_file2.vsd
Figure 5
Simulation file 2
Application Note
7
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
BLK
STEP
TRL
STEP
TRL
OST
CAP
TWO
OST
CAP
TRL
VIA
TRL
VIA
TRL
STEP
TRL
STEP
S_ON:
END
BLK
TRL
TRL
IND
RES
CAP
OST
ONE
OST
TRL
TEE
TRL
TRL
S_OFF
TRL
RXAN:
END
1 43
43 44
44 45
45 60
60
60
0
60 70 80
70
70
0
80 81
81
80 82
82
70 71
71 72
72 73
73
2
2POR 1 2
W1=WAP
W=WM
W1=WM
W=0.6MM
W=0.6MM
C=50fF
B81ON
W=0.6MM
C=50fF
W=1MM
D=0.5MM
W=1MM
D=0.5MM
W=0.6MM
W1=0.6MM
W=WM
W1=WM
W2=WM
P=PM
W2=0.6MM
P=0.4MM
P=0.4MM
P=0.4MM
P=1MM
p=1MM
P=0.8MM
W2=WM
P=PM
W2=W50
SUB
SUB
SUB
SUB
SUB
; BAR81W ON STATE
SUB
SUB
SUB
SUB
SUB
SUB
SUB
SUB
SUB
; SWITCH IN RECEIVE-MODE: TX-ANT OFF, RX-ANT ON
1
7
W=W50
P=4MM
SUB
7 10
W=W50
P=3MM
SUB
7
8
L=47nH
; Equivalent circuit of
8
0
R=2.0
; 47nH S+M 0603 SMD inductor
7
0
C=140fF
; in parallel resonance
10
W=W50
P=0.6MM
SUB
10 20
B63OF
; BAR63-02W OFF STATE
20
W=W50
P=0.6MM
SUB
20 30
W=W50
P=0.54MM
SUB
30 40 50 W1=W50
W2=WAP
W3=W50
SUB
50
2
W=W50
P=10MM
SUB
40 42
W=WAP
P=LL
SUB
42 75
; Shunt Diode ON-State
75
3
W=W50
P=3MM
SUB
3POR 1 2 3
; 1=TX 2=ANT 3=RX
AN049_sim ulation_file3.vsd
Figure 6
Simulation file 3
Application Note
8
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
BLK
TRL
TRL
IND
RES
CAP
OST
ONE
OST
TRL
TEE
TRL
TRL
S_ON
TRL
TXAN:
END
; SWITCH IN TRANSMIT-MODE: TX-ANT ON, RX-ANT OFF
1
7
W=W50
P=4MM
SUB
7 10
W=W50
P=3MM
SUB
7
8
L=47nH
; Equivalent circuit of
8
0
R=2.0
; 47nH S+M 0603 SMD inductor
7
0
C=140fF
; in parallel resonance
10
W=W50
P=0.6MM
SUB
10 20
B63ON
; BAR63-02W ON STATE
20
W=W50
P=0.6MM
SUB
20 30
W=W50
P=0.54MM
SUB
30 40 50 W1=W50
W2=WAP
W3=W50
SUB
50
2
W=W50
P=10MM
SUB
40 42
W=WAP
P=LL
SUB
42 75
; Shunt Diode OFF-State
75
3
W=W50
P=3MM
SUB
3POR 1 2 3
; 1=TX 2=ANT 3=RX
FREQ
STEP
END
100MHZ
3GHZ
DATA
SUB: MS H=0.25MM
B81OF:DUMMY
B81ON:DUMMY
B63OF:DUMMY
B63ON:DUMMY
END
10MHZ
ER=4.4 TAND=0.024 MET1=CU 18UM
FILE=MU5V00U0.S2P
FILE=MUV0010M.S2P
FILE=PT5V00U0.S1P
FILE=PTV0010M0.S1P
AN049_sim ulation_file4.vsd
Figure 7
Simulation file 4
Application Note
9
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
Computation and measurement results
Insertion Loss TX -> Antenna in Transmit-Mode
0
-2
-4
Insertion Loss [dB]
-6
-8
Computation
-10
Measurement
-12
-14
-16
-18
-20
0
0,5
1
1,5
2
2,5
Frequency [GHz]
3
AN049_TX_Antenna.vsd
Insertion Loss TX → Antenna in Transmit-Mode
Figure 8
Insertion Loss Antenna -> RX in Transmit-Mode
0
-5
Insertion Loss [dB]
-10
-15
Computation
-20
Measurement
-25
-30
-35
-40
0
0,5
1
1,5
2
Frequency [GHz]
Figure 9
2,5
3
AN049_Antenna_RX.vsd
Insertion Loss Antenna → RX in Transmit-Mode
Application Note
10
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
Insertion Loss TX -> RX in Transmit-Mode
0
-5
Insertion Loss [dB]
-10
-15
Computation
-20
Measurement
-25
-30
-35
-40
0
0,5
1
1,5
2
2,5
3
Frequency [GHz]
AN049_TX_RX.vsd
Insertion Loss TX → RX in Tranmit-Mode
Figure 10
Insertion Loss TX -> Antenna in Receive-Mode
0
-5
I nserti on Loss [dB]
-10
-15
Computation
-20
Measurement
-25
-30
-35
-40
0
0,5
1
1,5
2
Freqency [GHz]
Figure 11
2,5
3
AN049_TX_Antenna_receive.vsd
Insertion Loss TX → Antenna in Receive-Mode
Application Note
11
Rev. 2.0, 2006-10-11
Application Note No. 049
DECT Transmit - Receive Switch Using Ultra Small PIN Diodes
Insertion Loss Antenna -> RX in Receive-Mode
0
-2
-4
Insertion Loss [dB]
-6
-8
Computation
-10
Measurement
-12
-14
-16
-18
-20
0
0,5
1
1,5
2
2,5
Frequency [GHz]
3
AN049_Antenna_RX_receive.vsd
Insertion Loss Antenna → RX in Receive-Mode
Figure 12
Insertion Loss TX -> RX in Receive-Mode
0
-5
Insertion Loss [dB]
-10
-15
Computation
-20
Measurement
-25
-30
-35
-40
0
0,5
1
1,5
2
Frequency [GHz]
Figure 13
2,5
3
AN049_TX_RX_receive.vsd
Insertion Loss TX → RX in Receive-Mode
The computed isolation parameters are worse than measured. This is due to the dielectric losses of the material,
which seem to be lower than assumed for simulation.
Application Note
12
Rev. 2.0, 2006-10-11
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