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36.0-42.0 GHz GaAs Transmitter QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
38TX0768-QB
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
Mimix Broadband's 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 Broadband's 0.15 m 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.
General Description
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 Table 3
(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 Frequency Range (RF) Upper Side Band Frequency Range (RF) Lower Side Band Frequency Range (LO) Frequency Range (IF) Output Return Loss RF (S22) Small Signal Conversion Gain IF/RF (S21) 2 LO Input Drive (PLO) Leakage @ RF Port LOx1 Leakage @ RF Port LOx2 Output Third Order Intercept (OIP3) 1,2 Drain Bias Voltage (Vd) Gate Bias Voltage (Vg1) Gate Bias Voltage (Vg2) Mixer, Doubler Dynamic Range Control (Vc) Supply Current (Id) (Vd=4.0V) Supply Current (Ic)
Units GHz GHz GHz GHz dB dB dBm dBm dBm dBm VDC VDC VDC VDC mA mA Min. 36.0 36.0 16.0 DC -2.0 Typ. 10.0 5.0 +2.0 -25.0 -10.0 +17.0 +4.0 -0.4 -0.5 240 0.0
Max. 42.0 42.0 26.0 4.0 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. (c)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.
36.0-42.0 GHz GaAs Transmitter QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
38TX0768-QB
Transmitter Measurements
38TX0768-QB, USB Conv. Gain (dB) and Image Rejection (dBc) 10 5 CG (dB) and IR (dBc) CG (dB) and IR (dBc) 0 -5 -10 -15 -20 -25 36 37 38 39 40 41 42 RF USB (GHz) [IF=2 GHz] Conv Gain Image Rej 10 5 0 -5 -10 -15 -20 -25 36 37 38 39 40 41 42 RF LSB (GHz) [IF=2 GHz] Conv Gain Image Rej 38TX0768-QB, LSB Conv. Gain (dB) and Image Rejection (dBc)
38TX0768-QB, 1xLO to RF Leakage (dBm), P_LO=+2dBm 0 1xLO to RF Leakage (dBm) 2xLO to RF Leakage (dBm) -5 -10 -15 -20 -25 -30 17.0 0 -5 -10 -15 -20 -25 -30 17.0
38TX0768-QB, 2xLO to RF Leakage (dBm), P_LO=+2dBm
17.5
18.0
18.5
19.0
19.5
20.0
20.5
17.5
18.0
18.5
19.0
19.5
20.0
20.5
LO (GHz)
LO (GHz)
25
RFout-2xLO (dBc) vs. LO Freq P_LO=+2 dBm, IF_in=-10dBm
38TX0768-QB, Output IP3 (dBm) 20 18
20 RFout-2xLO (dBc) OIP3 (dBm)
16 14
15
12 10 8 6
10
5
4 2
USB LSB 36 37 38 39 RF (GHz) 40 41 42
0 17.0
0 17.5 18.0 18.5 19.0 LO Freq (GHz) 19.5 20.0 20.5
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099 Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 2 of 8
Characteristic Data and Specifications are subject to change without notice. (c)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.
36.0-42.0 GHz GaAs Transmitter QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
38TX0768-QB
Transmitter Measurements (cont.)
38TX0768-QB, Input IP3 (dBm) 18 16 14 12 IIP3 (dBm) 10 8 6 4 2 0 36 37 38 39 RF (GHz) 40 41 42 USB LSB CG (dB) and IIP3 (dBm) 20 15 10 5 0 -5 -10 -15 -20 -25 -30 -2.0 -1.8 CG @ USB CG @ LSB IIP3 @ USB IIP3 @ LSB 38TX0768-QB, Conv Gain and IIP3 vs Vc (Dynamic Range) RF=38GHz, IF=2GHz, P_IF=-3dBm/tone
-1.6
-1.4
-1.2
-1.0 Vc (V)
-0.8
-0.6
-0.4
-0.2
0.0
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099 Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 3 of 8
Characteristic Data and Specifications are subject to change without notice. (c)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.
36.0-42.0 GHz GaAs Transmitter QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
38TX0768-QB
Physical Dimensions
Functional Schematic
VD 28 27 GND IF1 26 25 GND 24 23 22
Package Pin-out Table
Pin Number 4 7 8 9 11 18 25 27 All other pins Pin Name RF Out VC VG1 VG2 IF2 LO IN IF1 VD1 GND Pin Function RF Out Gain Control LNA, LO Amp Mixer, Doubler IF2 Input LO Input IF1 Input Drain Bias Ground Nominal Value -2.0 to 0.0 -0.4 -0.5 +2.0 +4.0 Unit Volts volts volts dBm volts
1 2 GND RF OUT GND 3 4 5 6 VC 7
PA
21 20 19
Balanced Image Reject Mixer
LO Buffer
GND LO IN GND
x2
18 17 16 15
8 VG1
9
10
11 IF2
12 GND
13
14
VG2 GND
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099 Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 4 of 8
Characteristic Data and Specifications are subject to change without notice. (c)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.
36.0-42.0 GHz GaAs Transmitter QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
38TX0768-QB
Recommended Layout
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099 Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 5 of 8
Characteristic Data and Specifications are subject to change without notice. (c)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.
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.
38TX0768-QB, MTTF (yrs) vs. Backplate Temperature (C) 1.0E+05 1.0E+04 MTTF (Years) 1.0E+03 1.0E+02 1.0E+01 1.0E+00 55 65 75 Temperature (C) 85 95
Bias Conditions: Vd=4.0V, Id=240 mA
Typical Application
RF OUT 37.0-39.5 GHz
XP1005
38TX0768-QB
Coupler
IF In 2 GHz
Mixer
X
Buffer
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. (c)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.
36.0-42.0 GHz GaAs Transmitter QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
38TX0768-QB
App Note [3] USB/LSB Selection -
LSB
USB
For Upper Side Band operation (USB): With IF1 and IF2 connected to the direct port (0) and coupled port (90) respectively as shown in the diagram, the USB signal will reside on the isolated port. The input port must be loaded with 50 ohms.
IF2
IF1
For Lower Side Band operation (LSB): With IF1 and IF2 connected to the direct port (0) and coupled port (90) respectively as shown in the diagram, the LSB signal will reside on the input port. The isolated port must be loaded with 50 ohms.
An alternate method of Selection of USB or LSB:
USB
LSB
In Phas e Combiner
In Phas e Combiner
-90
o
-90 o
IF2
IF1
IF2
IF1
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099 Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 7 of 8
Characteristic Data and Specifications are subject to change without notice. (c)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.
36.0-42.0 GHz GaAs Transmitter QFN, 7x7 mm
October 2006 - Rev 05-Oct-06
38TX0768-QB
CAUTION! - Mimix Broadband MMIC Products contain gallium arsenide (GaAs) which can be hazardous to the human body and the environment. For safety, observe the following procedures: Do not ingest. Do not alter the form of this product into a gas, powder, or liquid through burning, crushing, or chemical processing as these by-products are dangerous to the human body if inhaled, ingested, or swallowed. Observe government laws and company regulations when discarding this product. This product must be discarded in accordance with methods specified by applicable hazardous waste procedures. Life Support Policy - Mimix Broadband's products are not authorized for use as critical components in life support devices or systems without the express written approval of the President and General Counsel of Mimix Broadband. As used herein: (1) Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. (2) A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Package Attachment - This packaged product from Mimix Broadband is provided as a rugged surface mount package compatible with high volume solder installation. The package is a low-cost plastic package. Vacuum tools or other suitable pick and place equipment may be used to pick and place this part. Care should be taken to ensure that there are no voids or gaps in the solder connection so that good RF, DC and ground connections are maintained. Voids or gaps can eventually lead not only to RF performance degradation, but reduced reliability and life of the product due to thermal stress.
Reflow Profile Ramp Up Rate Activation Time and Temperature Time Above Melting Point Max Peak Temperature Time Within 5 C of Peak Ramp Down Rate
SnPb 3-4 C/sec 60-120 sec @ 140-160 C 60-150 sec 240 C 10-20 sec 4-6 C/sec
Pb Free 3-4 C/sec 60-180 sec @ 170-200 C 60-150 sec 265 C 10-20 sec 4-6 C/sec
Mimix Lead-Free RoHS Compliant Program - Mimix has an active program in place to meet customer and governmental requirements for eliminating lead (Pb) and other environmentally hazardous materials from our products. All Mimix RoHS compliant components are form, fit and functional replacements for their non-RoHS equivalents. Lead plating of our RoHS compliant parts is 100% matt tin (Sn) over copper alloy and is backwards compatible with current standard SnPb low-temperature reflow processes as well as higher temperature (260C reflow) "Pb Free" processes. Part Number for Ordering 38TX0768-QB-0L00 38TX0768-QB-0L0T 38TX0768-QB-EV1 Description Ni/Pd/Au plated RoHS compliant QFN 7x7 28L surface mount package in bulk quantity Ni/Pd/Au plated RoHS compliant QFN 7x7 28L surface mount package in tape and reel 38TX0768-QB Evaluation Module
We also offer this part with alternative plating options. Please contact your regional sales manager for more information regarding different plating types.
Mimix Broadband, Inc., 10795 Rockley Rd., Houston, Texas 77099 Tel: 281.988.4600 Fax: 281.988.4615 mimixbroadband.com
Page 8 of 8
Characteristic Data and Specifications are subject to change without notice. (c)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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