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

Positive Voltage Supply

M/A-COM Products

REV.3

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.

Figure 5. Transmit On, Receive Off

Figure 6. Transmit Off, Receive On

DC BIAS

IDC = +20 or +50 mA [ANT to TX Path ON]

VANT = Voltage in which ANT resistor limits current to IDC

VTX = 0V

VRX = Voltage in which DC2 resistor limits current to IDC

Must be greater than VANT [RX Path OFF / DC2 Path On]

DC2 = 0

IDC = +20 or +50 mA [ANT to RX Path ON]

VANT = Voltages in which resistors limit current to IDC

VRX = 0V

VTX = Must be greater than VANT [TX Path OFF]

DC2 = Equal or higher than VRX [DC2 Path OFF]

Example

Positive Bias

Scheme

IDC = +50mA

VANT = +5V

VTX = 0V

VRX = +25V

DC2 = 0V

IDC = +50mA

VANT = +5V

VTX = +25V

VRX = +0V

DC2 = +5V

Tx - Antenna Rx - Antenna

RF Condition RF Condition

Insertion Loss

Isolation

Isolation

Insertion Loss

3

Figure 7. Single Positive Supply Biasing

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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