united | . monolithic semiconductors CHT3091a DC-40GHz ATTENUATOR GaAs Monolithic Microwave IC Description The CHT3091a is a variable DC 40 Ghz [ attenuator designed for a wide range of applications, from military to commercial communication systems. The backside of the chip is both RF and DCG grounds. This helps simplify the assembly process. LI eL UU The circuit is manufactured with a MESFET process, 0.7um gate length, via holes through | the substrate, air bridges and electron beam ys VP gate lithography. Main Features Broadband performances : DC-40GHz 15dBm minimum input 1dB compression point ( any attenuation) DC bias : -5V<VS<O0V ; -5V<VP<0V Chip size : 0.91 x 0.86 x 0.10 mm Main Characteristics Tamb. = 25C Symbol Parameter Min Typ Max Unit Fin Input frequency range DBC 40 GHz Min Att. | Minimum attenuation |S21| (VS=0V;VP=-5V) 3 dB Max Att. | Maximum attenuation |S21| (VS=-5V;VP=0V) 20 dB VSWRin | Input VSWR fany attenuation) 2.11 VSWRout | Output VSWR (any attenuation) 2.11 PinidB | Input 1dB compression point.(any attenuation) 15 dBm ESD Protection : Electrostatic discharge sensitive device. Observe handling precautions ! Ref. : DSCHT30919137 L/5 Specifications subject to change without notice United Monolithic Semiconductors S.A.S. Route Dpartementale 128 - B.P.46 - 91401 Orsay Cedex France Tel. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 CHT3091a DC-40GHz Attenuator Absolute Maximum Ratings Tamb. = 25C (1) Symbol Parameter Values Unit VP VP control voltage -6V V VS VS control voltage -6V V Pin RF input power 20 dBm Ta Operating temperature range -40 to +85 C Tstg Storage temperature range -55 to +155 C (1) Operation of this device above anyone of these parameters may cause permanent damage. Chip Assembly and Mechanical Data L_] L_] IN = qPOUT Ho 4 /- I u Tus YF 128 pr 1d@ pr to VS BE gate supply feed to VP DC gate supply feed Note : Supply teed should be capacitively bypassed. 25m diameter gold wire is to be prefered. v a5 [| juris LL ]7esq] [| CE foo 688 T . : Oo 680 i a" a B eee q us UP 79a 788 548 Bonding pad positions. ({ Chip thickness : 100pm. All dimensions are in micrometers ) Ref. : DSCHT30919137 WS Specifications subject to change without notice united Route Dpartementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE _ monolithic Tel.: +33 (0}1 69 33 03 08 - Fax : +33 (0)1 69.33 03 09 semiconductors DC-40GHz Attenuator CHT3091a Ref. : DSCHT30919137 WS Specifications subject to change without notice united Route Dpartementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE monolithic semiconductors 28, Tal.: +33 (0)1 69 33 0308 - Fax: +33 (0)1 69 33 0309 " HED CHT3091a DC-40GHz Attenuator Typical Results Chip Typical Response ( On wafer Sij ) : Tamb = +25C Vp = OV to -5V & Vs = -5V to OV CHT3091 Insertion Loss vs Control Voltages as Function of FREQUENCY (GHz ) Insertion Loss (dB } 5 4 3 2 A 0 Vp Control Voltage ( Volt ) with Vs = -5- Vp Insertion Loss ( dB) CHT3091 Gain control a 5 10 16 20 25 30 35 40 45 50 56 60 Frequency ( GHz ) Ref. : DSCHT30919137 Als Specifications subject to change without notice Route Dpartementale 128 , B.P.46- 91401 ORSAY Cedex - FRANCE unfnonailthic & oute Vepariementale : PP. - ex - - gs Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33.0309 semiconductors ae DC-40GHz Attenuator CHT3091a CHT3091 Input Return Loss Input Return Loss (dB } 0 5 10 15 20 25 30 35 40 45 50 55 60 Frequency ( GHz ) CHT3091 Output Return Loss Gutput Retum Loss (dB) 0 5 10 15 20 25 30 35 40 45 50 55 60 Frequency ( GHz } Ordering Information Chip form : CHT3091a-99F/00 Information furnished is believed to be accurate and reliable. However United Monolithic Semiconductors S.A.S. assumes no responsability 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 $.A.S.. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces alll 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. : DSCHT30919137 5/5 Specifications subject to change without notice united Route Dpartementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE monolithic ay 2 Boies ogee ieonduete Tal.: +33 (0)1 69 33 0308 - Fax: +33 (0)1 69 33 0309 seMEconGuctore