MASW-000834-000SMB View Datasheet(PDF) - M/A-COM Technology Solutions, Inc.

Part Name

Description

Manufacturer

MASW-000834-000SMB

Application Note on Sample Board Operation of the MASW-000834-13560T T/R Switch

M/A-COM Technology Solutions, Inc. 

MASW-000834-000SMB Sample Board

Application Note on Sample Board Operation of the

MASW-000834-13560T T/R Switch

M/A-COM Products

REV.3

Dual Positive and Negative Voltage

The sample board can accommodate dual polarity supplies as shown in Figures 8 through 10. In this

scheme, bias is applied to the Rx , Tx, and DC2 path. Unlike the single positive polarity bias scheme,

bias to the ANT port is not used. A series resistor on the ANT arm and second resistor on the DC2 path

will limit the current when a negative voltage is applied to the TX or RX Port. 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.

Figure 8. Transmit On, Receive Off

Figure 9. Transmit Off, Receive On

DC BIAS

Example

Dual Bias

Scheme

Tx - Antenna Rx - Antenna

RF Condition RF Condition

VTX = Negative voltage in which ANT resistor limits current

to IDC [ANT to TX Path ON]

VRX = Positive voltage level, greater than 0V in which DC2

resistor limits current to IDC [RX Path OFF / DC2 Path On]

VANT = 0V

VTX = -5V

VRX = +25V

DC2 = 0V

IDC = +/- 50mA

Low Loss

Isolation

VRX = Negative Voltage in which ANT resistor limits current

to IDC [ANT to RX Path ON]

VTX = Positive voltage level, greater than 0V in which DC2

resistor limits current to IDC [RX Path OFF / DC2 Path On]

VANT = 0V

VRX = -5V

VTX = +25V

DC2 = 0V

IDC = +/- 50mA

Isolation

Low Loss

Figure 10. Dual Positive and Negative Voltage Source Bias Truth Table

4

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.

• North America Tel: 800.366.2266 / Fax: 978.366.2266

• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300

• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298

Visit www.macom.com for additional data sheets and product information.

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