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App Note [1] Biasing - The device is operated by separately biasing Vd1 and Vd2 with Vd1=4.0V, Id1=80mA and

Vd2=4.0V, Id2=100mA. 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.

MTTF

Typical Application

Mimix Broadband MMIC-based 10.0-18.0 GHz Receiver Block Diagram

RF IN

10.0-18.0 GHz

IR Mixer

LNA

Coupler

XR1007-QD

BPF

IF Out

2 GHz

LO(+2.0dBm)

8.0-16.0 GHz (USB Operation)

12.0-20.0 GHz (LSB Operation)

AGC Control

Mimix Broadband's 10.0-18.0 GHz XR1007-QD GaAs Receiver can be used in saturated radio applications and linear modulation schemes up

to 256 QAM. The receiver can be used in upper and lower sideband applications from 10.0-18.0 GHz.

10.0-18.0 GHz GaAs Receiver

QFN, 7x7 mm

R1007-QD

XR1007-QD, MTTF (yrs) vs. Backplate Temperature (°C)

1.0E+00

1.0E+01

1.0E+02

1.0E+03

1.0E+04

1.0E+05

1.0E+06

55

65

75

85

95

Temperature (°C)

MTTF is calculated from accelerated life-time data of single devices and assumes an isothermal

back-plate.

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.

©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.

August 2007 - Rev 12-Aug-07