MASW-000834-000SMB Sample Board
Application Note on Sample Board Operation of the
MASW-000834-13560T T/R Switch
The following is an application guide for utiliza-
tion of the MASW-000834-13560T in conjunc-
tion with a supplied sample board from M/
ACOM. The guide will review the operation of
the T/R using a single positive supply as well as
other optional dual polarity supplies.
The MASW-000834-13560T is a T/R switch
with two PIN diodes in series in a common an-
ode configuration and one PIN diode in shunt on
the Rx path. The switch die along with select
matching components are mounted in a standard
4mm MLP 16 lead package (Figure 1). The
switch die utilizes
M/ACOM’s patented
HMIC process. The backside of the switch die
is thermally grounded while electrically iso-
lated. The excellent power handling of the die is
achieved through specific techniques using
unique thermal conductive epoxy embedded in
the die. This allows the heat to be transferred
from the series connected device to ground
while maintaining electrical isolation. The large
backside of the pad of the package is both
thermal and electrical ground. Figure 2 shows
the electrical/ thermal schematic of the device.
The sample board is made of Rogers RO4350
material 10mils thick dielectric with added lay-
ers to increase the board thickness to 62mils for
handling, rigidity and connector mounting.
There are on-board bias networks incorporated
to accommodate biasing the device without the
use of expensive external bias tees. Figure 3
shows the standard board layout with compo-
nent selection for optimized performance up to 6
GHz.
M/A-COM Products
REV.3
Figure 1. Package Outline Drawing
Figure 2. Electrical/Thermal Schematic
1
M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information
contained herein without notice. M/A-COM makes no warranty, representation or guarantee
regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any
liability whatsoever arising out of the use or application of any product(s) or information.
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
MASW-000834-000SMB Sample Board
Application Note on Sample Board Operation of the
MASW-000834-13560T T/R Switch
M/A-COM Products
REV.3
C1
R
L
C1
C1
L
L
C1: 27pF
C2: 12pF
L: 68nH
R: 100 Ohm
C2
L
C2
R
Figure 3. Sample Board Assembly Drawing
The diagram in Figure 4 is a schematic depiction of
the Figure 3 sample board drawing. There are 100
Ohm resistors on the ANT path and the DC2 path.
This topology allows for either an all-positive bias
scheme or a positive and negative bias scheme.
Figure 4. Sample Board Schematic
2
M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information
contained herein without notice. M/A-COM makes no warranty, representation or guarantee
regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any
liability whatsoever arising out of the use or application of any product(s) or information.
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
MASW-000834-000SMB Sample Board
Application Note on Sample Board Operation of the
MASW-000834-13560T T/R Switch
Positive Voltage Supply
To accommodate biasing with a single positive supply, DC voltage must be applied to the Antenna,
RX, TX, and DC2 ports. The resistor on the Antenna path will limit the current drawn when this volt-
age is applied. The resistor present on the DC2 bias path limits the current when the RX shunt diode is
turned on. To achieve optimum performance, 50mA of DC bias current to the diodes is necessary.
M/A-COM Tech supplies 100 Ohm resistors on these sample boards.
In order to achieve proper isolation in the “OFF” arm, the back bias (Vr) on the diodes should be large
enough to sustain higher power levels. The voltage levels can range from +5V to +25V, as shown in
the Figure. Minimum back bias requirements will change depending on incident peak RF Voltage and
frequency of operation. Please contact M/A-COM Technology Solutions for additional guidance on
required reverse bias voltages for specific application environments.
M/A-COM Products
REV.3
Figure 5. Transmit On, Receive Off
Figure 6. Transmit Off, Receive On
Example
Positive Bias
Scheme
I
DC
= +50mA
V
ANT
= +5V
V
TX
= 0V
V
RX
= +25V
DC2 = 0V
I
DC
= +50mA
V
ANT
= +5V
V
TX
= +25V
V
RX
= +0V
DC2 = +5V
Tx - Antenna
RF Condition
Rx - Antenna
RF Condition
DC BIAS
I
DC
= +20 or +50 mA
[ANT to TX Path ON]
V
ANT
= Voltage in which ANT resistor limits current to I
DC
V
TX
= 0V
V
RX
= Voltage in which DC2 resistor limits current to I
DC
Must be greater than
V
ANT
[RX Path OFF / DC2 Path On]
DC2
= 0
I
DC
= +20 or +50 mA
[ANT to RX Path ON]
V
ANT
= Voltages in which resistors limit current to I
DC
V
RX
= 0V
V
TX
= Must be greater than V
ANT
[TX Path OFF]
DC2
= Equal or higher than V
RX
[DC2 Path OFF]
3
Insertion Loss
Isolation
Isolation
Insertion Loss
Figure 7. Single Positive Supply Biasing
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information
contained herein without notice. M/A-COM makes no warranty, representation or guarantee
regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any
liability whatsoever arising out of the use or application of any product(s) or information.
MASW-000834-000SMB Sample Board
Application Note on Sample Board Operation of the
MASW-000834-13560T T/R Switch
Dual Positive and Negative Voltage
The sample board can accommodate dual polarity supplies as shown in Figures 8 through 10. In this
scheme, bias is applied to the Rx , Tx, and DC2 path. Unlike the single positive polarity bias scheme,
bias to the ANT port is not used. A series resistor on the ANT arm and second resistor on the DC2 path
will limit the current when a negative voltage is applied to the TX or RX Port. M/A-COM Tech
supplies 100 Ohm resistors on these sample boards.
In order to achieve proper isolation in the “OFF” arm, the back bias (Vr) on the diodes should be large
enough to sustain higher power levels. The voltage levels can range from +5V to +25V, as shown in
the Figure. Minimum back bias requirements will change depending on incident peak RF Voltage and
frequency of operation. Please contact M/A-COM Technology Solutions for additional guidance on
required reverse bias voltages for specific application environments.
M/A-COM Products
REV.3
Figure 8. Transmit On, Receive Off
Figure 9. Transmit Off, Receive On
Example
Dual Bias
Scheme
V
ANT
= 0V
V
TX
= -5V
V
RX
= +25V
DC2 = 0V
I
DC
= +/- 50mA
V
ANT
= 0V
V
RX
= -5V
V
TX
= +25V
DC2 = 0V
I
DC
= +/- 50mA
Tx - Antenna
RF Condition
Rx - Antenna
RF Condition
DC BIAS
V
TX
= Negative voltage in which ANT resistor limits current
to I
DC
[ANT to TX Path ON]
V
RX
= Positive voltage level, greater than 0V in which DC2
resistor limits current to I
DC
[RX Path OFF / DC2 Path On]
V
RX
= Negative Voltage in which ANT resistor limits current
to I
DC
[ANT to RX Path ON]
V
TX
= Positive voltage level, greater than 0V in which DC2
resistor limits current to I
DC
[RX Path OFF / DC2 Path On]
4
Low Loss
Isolation
Isolation
Low Loss
Figure 10. Dual Positive and Negative Voltage Source Bias Truth Table
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information
contained herein without notice. M/A-COM makes no warranty, representation or guarantee
regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any
liability whatsoever arising out of the use or application of any product(s) or information.
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