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CHM1290REF
20-30GHz SUB-HARMONICALLY PUMPED MIXER
GaAs Monolithic Microwave IC in SMD leadless package Description
The monolithic microwave IC (MMIC) in the package is a multi-function chip which integrates a self biased LO buffer amplifier and a sub-harmonic diode mixer for 2LO suppression. It is usable both for up- and down-conversion and it is designed for a wide range of applications, typically commercial communication systems for broadband local access (LMDS). The circuit is manufactured with a PMHEMT process, 0.25m gate length, via holes through the substrate, air bridges and electron beam gate lithography. It is supplied in a new SMD-type leadless chip carrier.
Main Features * * * * * * *
Broadband performance : 20-30GHz 10.5 dB conversion Loss -25dBm 2LO Power @ RF port -4dBm LO input power -3dBm input power 1dB compression Low DC power consumption, 33mA@ 3.0V Dimensions: 5.08 x 5.08 x 0.97 mm3
SMD Package Dimensions
Ref.: DSCCHM1290REF2239 -27-Aug.-02
1/6
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHM1290REF
Schematic
20-30GHz SHP Mixer
Typical Bias Conditions
For an ambient temperature of +25C Symbol
Vd Id
Pin No
3 3
Parameter
Drain bias Voltage Drain current
Values
4 33
Unit
V mA
Absolute Maximun Ratings (1)
Tamb. = 25C Symbol
Vd Pin Top Tstg Drain bias voltage Maximum peak input overdive (2) Operating temperature range (3) Storage temperature range
Parameter
Values
5 8 -55 to 85 -55 to 125
Unit
V dBm C C
(1) Operation of the device above anyone of these parameters may cause permanent damage (2) Duration <1s (3) Upper temperature limit strongly dependent on motherboard design; ratings given for ideal thermal coupling.
Ref. : DSCCHM1290REF2239 -27-Aug.-02 2/6 Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
20-30GHz SHP Mixer
Vd=4V, Id at 33mA
CHM1290REF
Typical results on PCB (recommended motherboard layout)
CHM1290 SMD packaged : UP-CONVERTER ( Conv. Losses & Leakages )
Vds=4V / Ids=33mA / LO Power=-4dBm / IF Frequency= 1Ghz
0 -2.5 -5 Conversion Loss (dB) -7.5
RF(+)=21 GHz RF(+)=31 GHz
5 Lc(2xLO-IF) Lc(2xLO+IF) 2*OL/RF OL/RF 0 -5 -10 -15 -20 -25
RF(-)=29 GHz
-10 -12.5 -15 -17.5 -20
RF(-)=19 GHz
-30 -35 -40 -45 9 10 11 12 13 14 15 16
-22.5 -25
LO Frequency (GHz)
CHM1290 SMD packaged : UP-CONVERTER ( Conv. Losses & Leakages )
Vds=4V / Ids=33mA / LO Power=0dBm / IF Frequency= 1Ghz
0 -2.5 -5 -7.5 Conversion Loss (dB) -10 -12.5 5
Lc(2xLO-IF)
Lc(2xLO+IF)
2*OL/RF
OL/RF
0 -5
RF(+)=21 GHz
RF(+)=31 GHz
-10 -15 -20
RF(-)=29 GHz
-15 -17.5 -20 -22.5 -25 9 10 11 12 13 14 15 16 -25
RF(-)=19 GHz
-30 -35 -40 -45
LO Frequency (GHz)
Ref. : DSCCHM1290REF2239 -27-Aug.-02
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Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
Leakage @ LO & 2xLO (dBm)
Leakage @ LO & 2xLO (dBm)
CHM1290REF
Footprint
20-30GHz SHP Mixer
Please note that PIN 1 is located in the lower left corner of the package (front-side view) for all SMD-type packages from United Monolithic Semiconductors. It is indicated by a triangle on the package lid. Starting with PIN 1 the other pads are numbered counter-clockwise (front-side view). ATTENTION: The dot on the backside of the package (i.e. side with metallic pads) is just for fabrication purposes and does NOT indicate the location of PIN 1.
Ref. : DSCCHM1290REF2239 -27-Aug.-02
4/6
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
20-30GHz SHP Mixer
Application note
CHM1290REF
The design of the motherboard has a strong impact on the over all performance since the transition from the motherboard to the package is comparably large. In case of the SMD-type packages of United Monolithic Semiconductors the motherboard should be designed according to the information given in the following to achieve good performance. Other configurations are also possible but can lead to different results. If you need advise please contact United Monolithic Semiconductors for further information. SMD-type packages of UMS should allow design and fabrication of micro- and mmwave modules at low cost. Therefore, a suitable motherboard environment has been chosen. All tests and verifications have been performed on Rogers RO4003. This material exhibits a permittivity of 3.38 and has been used with a thickness of 200m [8 mils] and a 1/2oz or less copper cladding. The corresponding 50 Ohm transmission line has a strip width of about 460m [approx. 18 mils]. The contact areas on the motherboard for the package connections should be designed according to the footprint given above. The proper via structure under the ground pad is very important in order to achieve a good RF and lifetime performance. All tests have been done by using a grid of plenty plated through vias with a diameter of less than 200m [8 mils] and a spacing of less than 400m [16 mils] from the centres of two adjacent vias. The via grid should cover the whole space under the ground pad and the vias closest to the RF ports should be located near the edge of the pad to allow a good RF ground connection. Since the vias are important for heat transfer, a proper via filling should be guaranteed during the mounting procedure to get a low thermal resistance between package and heat sink. For power devices the use of heat slugs in the motherboard instead of a via grid is recommended. For the mounting process the SMD-type package can be handled as a standard surface mount component. The use of either solder or conductive epoxy is possible. The solder thickness after reflow should be typical 50m [2 mils] and the lateral alignment between the package and the motherboard should be within 50m [2 mils]. Caution should be taken to obtain a good and reliable contact over the whole pad areas. Voids or other improper connections, in particular, between the ground pads of motherboard and package will lead to a deterioration of the RF performance and the heat dissipation. The latter effect can reduce drastically reliability and lifetime of the product.
Ref. : DSCCHM1290REF2239 -27-Aug.-02
5/6
Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHM1290REF
20-30GHz SHP Mixer
The RF ports comprise a DC blocking capacitor on chip level. The DC connections include a first level of DC decoupling capacitors (typically 120pF) in the package. However, all DC bias ports should be additionally connected to ground with 10nF capacitors at board level to prevent the MMIC from oscillations. These parts should be placed close to the SMD leadless package. If the same bias is required at different DC ports, the lines should only be connected behind these block capacitors. Further information on the application of the SMD leadless packages for GaAs monolithic microwave ICs are given in the UMS Application Note AN0005.
Ref. : DSCCHM1290REF2239 -27-Aug.-02
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Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
20-30GHz SHP Mixer
CHM1290REF
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Ref. : DSCCHM1290REF2239 -27-Aug.-02
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Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
CHM1290REF
20-30GHz SHP Mixer
Ordering Information
SMD leadless package form : CHM1290REF/24
Information furnished is believed to be accurate and reliable. However United Monolithic Semiconductors S.A.S. assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of United Monolithic Semiconductors S.A.S.. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. United Monolithic Semiconductors S.A.S. products are not authorised for use as critical components in life support devices or systems without express written approval from United Monolithic Semiconductors S.A.S.
Ref. : DSCCHM1290REF2239 -27-Aug.-02
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Specifications subject to change without notice
Route Departementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09

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