CHT3091a DC-40GHz ATTENUATOR GaAs Monolithic Microwave IC Description The CHT3091a is a variable DC-40GHz attenuator designed for a wide range of applications, from military to commercial communication systems. The backside of the chip is both RF and DC grounds. This helps simplify the assembly process. The circuit is manufactured with a MESFET process, 0.7µm gate length, via holes through the substrate and air bridges. . Main Features ■ Broadband performances : DC-40GHz ■ 15dBm minimum input 1dB compression point ( any attenuation) ■ DC bias : -5V<VS<0V ; -5V<VP<0V ■ Chip size : 0.91 x 0.86 x 0.10 mm Main Characteristics Tamb. = 25°C Symbol Fin Parameter Min Input frequency range Typ DC Max Unit 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 (any attenuation) 2.:1 VSWRout Output VSWR (any attenuation) Pin1dB 2.:1 Input 1dB compression point.(any attenuation) 15 dBm ESD Protection : Electrostatic discharge sensitive device. Observe handling precautions ! Ref. : DSCHT30911074 -15-Mar.-01 1/4 Specifications subject to change without notice United Monolithic Semiconductors S.A.S. Route Départementale 128 - B.P.46 - 91401 Orsay Cedex France Tel. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 DC-40GHz Attenuator CHT3091a Absolute Maximum Ratings Tamb. = 25°C (1) Symbol 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 Storage temperature range -55 to +155 °C Tstg (1) Parameter Operation of this device above anyone of these parameters may cause permanent damage. Chip Assembly and Mechanical Data Note : Supply feed should be capacitively bypassed. 25µm diameter gold wire is to be prefered. Bonding pad positions. ( Chip thickness : 100µm. All dimensions are in micrometers ) Ref. : DSCHT30911074 -15-Mar.-01 2/4 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 Specifications subject to change without notice DC-40GHz Attenuator CHT3091a Typical Results Chip Typical Response ( On wafer Sij ) : Tamb = +25°C Vp = 0V to -5V & Vs = -5V to 0V 0 CHT3091 Insertion Loss vs Control Voltages as Function of FREQUENCY ( GHz ) -2 -4 -6 -8 Insertion Loss ( dB ) -10 -12 -14 -16 Frequency ( GHz ) -18 5 10 20 30 40 -20 -22 -24 -26 -28 -30 -5 -4 -3 -2 -1 0 Vp Control Voltage ( Volt ) with Vs = -5 - Vp 0 -2 -4 -6 -8 Insertion Loss ( dB ) -10 -12 -14 -16 -18 -20 -22 CHT3091 Gain control -24 -26 -28 -30 0 5 10 15 20 25 30 35 40 45 50 55 Frequency ( GHz ) vvRef. : DSCHT30911074 -15-Mar.-01 3/4 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 Specifications subject to change without notice 60 DC-40GHz Attenuator CHT3091a 0 -2 -4 -6 CHT3091 Input Return Loss Input Return Loss ( dB ) -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -30 0 5 10 15 20 25 30 35 40 45 50 55 60 35 40 45 50 55 60 Frequency ( GHz ) 0 -2 -4 -6 CHT3091 Output Return Loss Output Return Loss ( dB ) -8 -10 -12 -14 -16 -18 -20 -22 -24 -26 -28 -30 0 5 10 15 20 25 30 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 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. : DSCHT30911074 -15-Mar.-01 4/4 Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 Specifications subject to change without notice