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38TX0768-QB Schematic ( PDF Datasheet ) - Mimix Broadband

Teilenummer 38TX0768-QB
Beschreibung GaAs Transmitter QFN
Hersteller Mimix Broadband
Logo Mimix Broadband Logo 




Gesamt 8 Seiten
38TX0768-QB Datasheet, Funktion
36.0-42.0 GHz GaAs Transmitter
QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
Features
Sub-harmonic, Image Reject Transmitter
Integrated Mixer, LO Doubler/Buffer & Output Amplifier
+17.0 dBm Output Third Order Intercept (OIP3)
+2.0 dBm LO Drive Level
5.0 dB Conversion Gain
100% RF and DC Testing
38TX0768-QB
General Description
Mimix Broadbands 36.0-42.0 GHz GaAs transmitter has a +17.0 dBm
output third order intercept across the band.This device is a balanced,
resistive pHEMT mixer followed by a distributed output amplifier and
includes an integrated LO doubler and LO buffer amplifier.The use of
integrated LO doubler and LO buffer amplifier makes the provision of
the LO easier than for fundamental mixers at these frequencies. I and Q
mixer inputs are provided and an external 90 degree hybrid is required
to select the desired sideband.This device uses Mimix Broadbands
0.15 µm GaAs PHEMT device model technology, and is based upon
electron beam lithography to ensure high repeatability and uniformity.
This device is well suited for Millimeter-wave Point-to-Point Radio,
LMDS, SATCOM and VSAT applications.
Absolute Maximum Ratings
Supply Voltage (Vd)
Supply Current (Id1,Id2)
Gate Bias Voltage (Vg)
Input Power (IF Pin)
Storage Temperature (Tstg)
Operating Temperature (Ta)
Channel Temperature (Tch)
+6.0 VDC
350 mA
+0.3 VDC
0.0 dBm
-65 to +165 OC
-55 to MTTF Table3
MTTF Table3
(3) Channel temperature affects a device's MTTF. It is
recommended to keep channel temperature as low as
possible for maximum life.
Electrical Characteristics (Ambient Temperature T = 25o C)
Parameter
Units Min. Typ. Max.
Frequency Range (RF) Upper Side Band
GHz 36.0 - 42.0
Frequency Range (RF) Lower Side Band
GHz 36.0 - 42.0
Frequency Range (LO)
GHz 16.0 - 26.0
Frequency Range (IF)
GHz DC - 4.0
Output Return Loss RF (S22)
Small Signal Conversion Gain IF/RF (S21) 2
dB - 10.0 -
dB - 5.0 -
LO Input Drive (PLO)
dBm - +2.0 -
Leakage @ RF Port LOx1
dBm - -25.0 -
Leakage @ RF Port LOx2
Output Third Order Intercept (OIP3) 1,2
dBm - -10.0 -
dBm - +17.0 -
Drain Bias Voltage (Vd)
VDC - +4.0 -
Gate Bias Voltage (Vg1)
VDC - -0.4 -
Gate Bias Voltage (Vg2) Mixer, Doubler
VDC - -0.5 -
Dynamic Range Control (Vc)
VDC -2.0 - 0.0
Supply Current (Id) (Vd=4.0V)
mA - 240 -
Supply Current (Ic)
mA - 0.0 -
(1) Measured using constant current.
(2) Measured using LO Input drive level of +2.0 dBm.
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 1 of 8
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.






38TX0768-QB Datasheet, Funktion
36.0-42.0 GHz GaAs Transmitter
QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
38TX0768-QB
App Note [1] Biasing - App Note [1] Biasing - The device is operated by biasing VD=4.0V with ID=240mA. 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.The VC bias pin controls an integrated attenuator where VC=-1.3 V provides the minimum attenuation and
VC = 0.0 V provides the maximum attenuation (approximately 25 dB).
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 VG1= -0.4V.
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.
1.0E+05
38TX0768-QB, MTTF (yrs) vs. Backplate Temperature (°C)
1.0E+04
1.0E+03
1.0E+02
1.0E+01
1.0E+00
55
65 75 85
Temperature (°C)
Bias Conditions: Vd=4.0V, Id=240 mA
Typical Application XP1005
RF OUT
37.0-39.5 GHz
38TX0768-QB
XMixer
Buffer
95
Coupler
IF In
2 GHz
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 Transmitter Block Diagram
(Changing LO and IF frequencies as required allows design to operate as high as 42 GHz)
Mimix Broadband's 36.0-42.0 GHz 38TX0768-QB GaAs Transmitter can be used in saturated radio applications and linear modulation
schemes up to 128 QAM.The transmitter can be used in upper and lower sideband applications from 36.0-42.0 GHz.
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099
Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 6 of 8
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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