MA-COM MASW-000822

MASW-000822-000SMB
Application Note on Sample Board Operation of the
MASW-000822-12770T T/R Switch
Rev 1
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 components 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 isolated. 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 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 without the use of expensive external bias
tees. Figure 3 shows the standard board
layout with component selection for optimize performance up to 6 GHz.
Figure 1.
Figure 2. Electrical/Thermal Schematic
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.
MASW-000822-000SMB
Application Note on Sample Board Operation of the
MASW-000822-12770T T/R Switch
Rev 1
Figure 3. Sample board layout
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 MASW000822-12770T 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 supply. 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
Rx-Antenna
RF Condition
Tx-Antenna
RF Condition
IDC = -10 or - 20 mA
Vr(Tx), +40 ≥ 0V
Low Loss
Isolation
IDC = -10 or – 20 mA
Vr (RX), +40 ≥ 0V
Isolation
Low Loss
VDC, +40 ≥ 0V
Vr(Tx) & Vr(Rx) , +40 ≥ 0V
Isolation
Isolation
Figure 5. Dual Positive and Negative Supply Biasing
As mentioned, the sample board supplied 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 transmission 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
through the Antenna port. This can be
achieved with slight modification of the
existing sample board. The 100 ohm resistor would be removed and a
“jumper” wire would have to be soldered at the point where the shunt capacitor and bias choke intersect. The
schematic representation Figure 6.
shows the use of a single positive supply 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.
3
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
Rx-Antenna
RF Condition
Tx-Antenna
RF Condition
IDC = -10 or - 20 mA
Vr(Tx), +40 ≥ 0V
Low Loss
Isolation
IDC = -10 or – 20 mA
Vr (RX), +40 ≥ 0V
Isolation
Low Loss
VDC, +40 ≥ 0V
Vr(Tx) & Vr(Rx) , +40 ≥ 0V
Isolation
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.