19.0-26.0 GHz GaAs MMIC
Transmitter
August 2007 - Rev 20-Aug-07
U1003-BD
App Note [1] Biasing
- As shown in the bonding diagram, this device is operated by separately biasing Vd1 and Vd2
with Vd1=4.0V, Id1=230mA and Vd2=4.0V, Id2=116mA. It is also recommended to use active biasing to keep the currents
constant as the RF power and temperature vary; this gives the most reproducible results. Depending on the supply
voltage available and the power dissipation constraints, the bias circuit may be a single transistor or a low power
operational amplifier, with a low value resistor in series with the drain supply used to sense the current. The gate of the
pHEMT is controlled to maintain correct drain current and thus drain voltage. The typical gate voltage needed to do this
is -0.3V. Typically the gate is protected with Silicon diodes to limit the applied voltage. Also, make sure to sequence the
applied voltage to ensure negative gate bias is available before applying the positive drain supply.
App Note [2] Bias Arrangement
- Each DC pad (Vd1,2 and Vg1,2) needs to have DC bypass capacitance (~100-200 pF)
as close to the device as possible. Additional DC bypass capacitance (~0.01 uF) is also recommended.
MTTF Tables (TBD)
These numbers were calculated based on accelerated life test information and thermal model analysis received from the fabricating foundry.
Backplate
Temperature
55 deg Celsius
75 deg Celsius
95 deg Celsius
Channel
Temperature
deg Celsius
deg Celsius
deg Celsius
Rth
MTTF Hours
FITs
C/W
C/W
C/W
E+
E+
E+
E+
E+
E+
Bias Conditions:
Vd1=4.0V, Vd2=4.0V, Id1=230 mA, Id2=116 mA
Typical Application
XU1003-BD
Sideband
Reject
XB1004-BD
XP1013-BD
IF IN
2 GHz
RF Out
21.2-23.6 GHz
LO(+2.0dBm)
9.6-10.8 GHz (USB Operation)
11.6-12.8 GHz (LSB Operation)
Mimix Broadband MMIC-based 19.0-26.0 GHz Transmitter Block Diagram
(Changing LO and IF frequencies as required allows design to operate as high as 26 GHz)
Mimix Broadband's 19.0-26.0 GHz XU1003-BD GaAs MMIC Transmitter can be used in saturated radio applications and
linear modulation schemes up to 16 QAM. The transmitter can be used in upper and lower sideband applications from
19.0-26.0 GHz.
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 4 of 7
Characteristic Data and Specifications are subject to change without notice.
©2007
Mimix Broadband, Inc.
Export of this item may require appropriate export licensing from the U.S. Government. In purchasing these parts, U.S. Domestic customers accept
their obligation to be compliant with U.S. Export Laws.
MIMIX [ MIMIX BROADBAND ]
