MASW-000822-000SMB MA-COM [M/A-COM Technology Solutions, Inc.], MASW-000822-000SMB Datasheet - Page 3

• Manufacturer Part Number: MASW-000822-000SMB
• Description: Application Note on Sample Board Operation of the MASW-000822-12770T T/R Switch
• Manufacturer: MA-COM [M/A-COM Technology Solutions, Inc.]

3
ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions
is considering for development. Performance is based on target specifications, simulated results,
and/or prototype measurements. Commitment to develop is not guaranteed.
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.
Commitment to produce in volume is not guaranteed.
Application Note on Sample Board Operation of the
MASW-000822-12770T T/R Switch
MASW-000822-000SMB
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
Vr(
I
I
DC
DC
Tx
Vr (
Vr(
) & Vr(
V
= -10 or – 20 mA
= -10 or - 20 mA
DC Current
DC
Tx
RX
, +40 ≥ 0V
), +40 ≥ 0V
), +40 ≥ 0V
Rx
) , +40 ≥ 0V
Figure 5. Dual Positive and Negative Supply Biasing
RF Condition
Rx-Antenna
Low Loss
Isolation
Isolation
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
changes to the product(s) or information contained herein without notice.
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.
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Visit www.macomtech.com for additional data sheets and product information.
RF Condition
Tx-Antenna
Low Loss
Isolation
Isolation
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Rev 1