MASW-000822-000SMB
Application Note on Sample Board Operation of the
MASW-000822-12770T T/R Switch
The following is an application guide for
utilization of the MASW-000822-12770T
in conjunction with a supplied sample
board from M/ACOM Tech. 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-000822-12770T is a T/R
switch with two PIN diodes in series in a
common anode configuration. The
switch die along with matching compo-
nents are mounted in a standard 3mm
MLP 16 lead package (Figure 1). The
switch die utilizes M/ACOM Technology
Solutions patented HMIC process. The
backside of the switch die is thermally
grounded while being electrically iso-
lated. The excellent power handling of
the die is achieved through specific
techniques using unique thermal con-
ductive 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 a added layers 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 with-
out the use of expensive external bias
tees. Figure 3 shows the standard board
layout with component selection for op-
timize performance up to 6 GHz.
1
ADVANCED:
Data Sheets contain information regarding a product M/A-COM Technology Solutions
•
North America
Tel: 800.366.2266 •
Europe
Tel: +353.21.244.6400
is considering for development. Performance is based on target specifications, simulated results,
•
India
Tel: +91.80.43537383
•
China
Tel: +86.21.2407.1588
and/or prototype measurements. Commitment to develop is not guaranteed.
Visit www.macomtech.com for additional data sheets and product information.
PRELIMINARY:
Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
Commitment to produce in volume is not guaranteed.
changes to the product(s) or information contained herein without notice.
Rev 1
Figure 1.
Figure 2. Electrical/Thermal Schematic
MASW-000822-000SMB
Application Note on Sample Board Operation of the
MASW-000822-12770T T/R Switch
Figure 3. Sample board layout
Rev 1
The board was specifically designed for
the new series of high power switches
and therefore is interchangeable. The
component selection and RF ports are
specific to part number and operating
frequency. In figure 3. the component
selection is specific to the MASW-
000822-12770T switch and as shown in
the drawing the RF2 is cut and not
used.
In this case the board is intended to be
biased with a negative & positive sup-
ply. The schematic in Figure 4. shows
the schematic representation of the
board and switch. The intention of this
board was use the TX and RF ports for
the bias paths, however , the device can
be biased as any SPDT switch.
Figure 4. Sample Board Schematic
2
ADVANCED:
Data Sheets contain information regarding a product M/A-COM Technology Solutions
•
North America
Tel: 800.366.2266 •
Europe
Tel: +353.21.244.6400
is considering for development. Performance is based on target specifications, simulated results,
•
India
Tel: +91.80.43537383
•
China
Tel: +86.21.2407.1588
and/or prototype measurements. Commitment to develop is not guaranteed.
Visit www.macomtech.com for additional data sheets and product information.
PRELIMINARY:
Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
Commitment to produce in volume is not guaranteed.
changes to the product(s) or information contained herein without notice.
MASW-000822-000SMB
Application Note on Sample Board Operation of the
MASW-000822-12770T T/R Switch
Rev 1
DC Current
I
DC
= -10 or - 20 mA
Vr(
Tx
), +40
≥
0V
I
DC
= -10 or – 20 mA
Vr (
RX
), +40
≥
0V
V
DC
, +40
≥
0V
Vr(
Tx
) & Vr(
Rx
) , +40
≥
0V
Rx-Antenna
RF Condition
Low Loss
Isolation
Isolation
Tx-Antenna
RF Condition
Isolation
Low Loss
Isolation
Figure 5. Dual Positive and Negative Supply Biasing
As mentioned, the sample board sup-
plied accommodates only when there
are dual polarity supplies available. The
schematic representation shows the
biasing required to turn the PIN diodes
“ON” and “OFF” for signal transmis-
sion and isolation. The truth table
shows the reverse bias voltage through
the device and current draw for Low
Loss and Isolation states of Tx and Rx
arms.
In order to accommodate biasing when
a single positive supply is available, it
is required that bias be available
3
through the Antenna port. This can be
achieved with slight modification of the
existing sample board. The 100 ohm re-
sistor would be removed and a
“jumper” wire would have to be sol-
dered at the point where the shunt ca-
pacitor and bias choke intersect. The
schematic representation Figure 6.
shows the use of a single positive sup-
ply to achieve same results. In order to
achieve proper isolation in the “OFF”
arm, the back bias (Vr) on the devices
should be large enough to sustain
higher power levels.
ADVANCED:
Data Sheets contain information regarding a product M/A-COM Technology Solutions
•
North America
Tel: 800.366.2266 •
Europe
Tel: +353.21.244.6400
is considering for development. Performance is based on target specifications, simulated results,
•
India
Tel: +91.80.43537383
•
China
Tel: +86.21.2407.1588
and/or prototype measurements. Commitment to develop is not guaranteed.
Visit www.macomtech.com for additional data sheets and product information.
PRELIMINARY:
Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
Commitment to produce in volume is not guaranteed.
changes to the product(s) or information contained herein without notice.
MASW-000822-000SMB
Application Note on Sample Board Operation of the
MASW-000822-12770T T/R Switch
Rev 1
DC Current
I
DC
= -10 or - 20 mA
Vr(
Tx
), +40
≥
0V
I
DC
= -10 or – 20 mA
Vr (
RX
), +40
≥
0V
V
DC
, +40
≥
0V
Vr(
Tx
) & Vr(
Rx
) , +40
≥
0V
Rx-Antenna
RF Condition
Low Loss
Isolation
Isolation
Tx-Antenna
RF Condition
Isolation
Low Loss
Isolation
Figure 6. Single Positive Supply Biasing
4
ADVANCED:
Data Sheets contain information regarding a product M/A-COM Technology Solutions
•
North America
Tel: 800.366.2266 •
Europe
Tel: +353.21.244.6400
is considering for development. Performance is based on target specifications, simulated results,
•
India
Tel: +91.80.43537383
•
China
Tel: +86.21.2407.1588
and/or prototype measurements. Commitment to develop is not guaranteed.
Visit www.macomtech.com for additional data sheets and product information.
PRELIMINARY:
Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
Commitment to produce in volume is not guaranteed.
changes to the product(s) or information contained herein without notice.
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