35.0-45.0 GHz GaAs Receiver
QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
40REC0770-QB
App Note [1] Biasing
- The device is operated by biasing VD=4.0V with ID=180 mA. Additionally, a mixer and doubler bias are also required
with VG2=-0.5V. Adjusting Vg2 above or below this value can adversely affect conversion gain, image rejection and intercept point
performance. It is 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.
MTTF
MTTF is calculated from accelerated life-time data of single devices and assumes an isothermal back-plate.
40REC0770-QB, MTTF (yrs) vs. Backplate Temperature (°C)
1.E+05
1.E+04
MTTF (Years)
1.E+03
1.E+02
1.E+01
1.E+00
55
65
75
Temperature (°C)
85
95
Bias Conditions:
Vd=4.0V, Id=180 mA
Typical Application
RF IN
37.0-39.5 GHz
40REC0770-QB
Coupler
BPF
IF Out
2 GHz
LNA
IR Mixer
Buffer
AGC Control
X2
LO(+2.0dBm)
17.5-18.75 GHz (USB Operation)
19.5-20.75 GHz (LSB Operation)
Mimix Broadband MMIC-based 35.0-45.0 GHz Receiver Block Diagram
(Changing LO and IF frequencies as required allows design to operate as high as 46 GHz)
Mimix Broadband's 30.0-46.0 GHz 40REC0770-QB GaAs MMIC Receiver can be used in saturated radio applications and linear modulation
schemes up to 128 QAM.
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 5 of 7
Characteristic Data and Specifications are subject to change without notice.
©2006
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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