11.0-17.0 GHz GaAs MMIC
Receiver
December 2005 - Rev 30-Dec-05
14REC0607
App Note [1] Biasing
- As shown in the bonding diagram, this device is operated by separately biasing Vd1=3.0V with Id1=80mA and
Vd3=5.0V with Id3=100mA. Additionally, a mixer bias is also required with Vg4=-0.5V. Adjusting Vg4 above or below this value can adversely
affect conversion gain, image rejection and intercept point performance. 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
Also, make sure to sequence the applied voltage to ensure negative gate bias is available before applying the positive drain supply.
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.
App Note [2] Bias Arrangement
-
For Parallel Stage Bias (Recommended for general applications) -- The same as Individual Stage Bias but all the drain or gate pad DC bypass
capacitors (~100-200 pF) can be combined. Additional DC bypass capacitance (~0.01 uF) is also recommended to all DC or combination (if
gate or drains are tied together) of DC bias pads.
For Individual Stage Bias -- Each DC pad (Vd1,3 and Vg1,2,3,4) 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.
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
du
E+
E+
E+
Coupler
MTTF Table (TBD)
MTTF Hours
C/W
C/W
C/W
pr
o
IR Mixer
Bias Conditions:
Vd1=3.0V, Id1=80mA, Vd3=5.0V, Id3=100 mA
Typical Application
RF IN
11.0-17.0 GHz
14REC0607
BPF
ct
FITs
E+
E+
E+
IF Out
2 GHz
AGC Control
Page 5 of 8
Pr
e-
LNA
Buffer
LO(+3.0dBm)
9.0-15.0 GHz (USB Operation)
13.0-19.0 GHz (LSB Operation)
Mimix Broadband MMIC-based 11.0-17.0 GHz Receiver Block Diagram
Mimix Broadband's 11.0-17.0 GHz GaAs MMIC Receiver can be used in saturated radio applications and linear modulation schemes up to
128 QAM. The receiver can be used in upper and lower sideband applications from 11.0-17.0 GHz.
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Characteristic Data and Specifications are subject to change without notice.
©2005
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.
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MIMIX [ MIMIX BROADBAND ]
