MASW-000834-000SMB MA-COM [M/A-COM Technology Solutions, Inc.], MASW-000834-000SMB Datasheet - Page 3

• Manufacturer Part Number: MASW-000834-000SMB
• Description: Application Note on Sample Board Operation of the MASW-000834-13560T T/R Switch
• Manufacturer: MA-COM [M/A-COM Technology Solutions, Inc.]

MASW-000834-000SMB Sample Board
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.
3
Application Note on Sample Board Operation of the
MASW-000834-13560T T/R Switch
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.
I
V
V
V
DC2 = 0
I
V
V
V
DC2 = Equal or higher than V
DC
DC
ANT
TX
RX
ANT
RX
TX
= +20 or +50 mA
= +20 or +50 mA
= Must be greater than V
= 0V
= 0V
= Voltage in which DC2 resistor limits current to I
= Voltage in which ANT resistor limits current to I
= Voltages in which resistors limit current to I
Figure 5. Transmit On, Receive Off
Must be greater than V
[ANT to TX Path ON]
[ANT to RX Path ON]
DC BIAS
ANT
RX
ANT
[TX Path OFF]
[DC2 Path OFF]
Figure 7. Single Positive Supply Biasing
[RX Path OFF / DC2 Path On]
Positive Voltage Supply
DC
DC
DC
I
V
V
V
DC2 = 0V
I
V
V
V
DC2 = +5V
DC
DC
Positive Bias
ANT
TX
RX
ANT
TX
RX
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Visit www.macom.com for additional data sheets and product information.
= +50mA
= +50mA
Example
= 0V
= +25V
Scheme
= +25V
= +0V
= +5V
= +5V
Figure 6. Transmit Off, Receive On
RF Condition
Insertion Loss
Tx - Antenna
Isolation
M/A-COM Products
RF Condition
Rx - Antenna
Insertion Loss
Isolation
REV.3