MASW-000822-000SMB Datasheet, PDF (3/4 Pages) M/A-COM Technology Solutions, Inc. – Application Note on Sample Board Operation of the MASW-000822-12770T T/R Switch

MASW-000822-000SMB
Application Note on Sample Board Operation of the
Rev 1
MASW-000822-12770T T/R Switch
DC Current
Rx-Antenna
RF Condition
Tx-Antenna
RF Condition
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
Low Loss
Isolation
Isolation
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
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.
3
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