CHA3512 RoHS COMPLIANT 6-18GHz Low Noise Digital Variable Amplifier GaAs Monolithic Microwave IC Description The CHA3512 is composed by a Single Pole Double Through (SPDT) switch followed by a one step digital attenuator and a double stage travelling wave amplifier. It is designed for defense applications. The backside of the chip is both RF and DC grounded. This helps to simplify the assembly process. The circuit is manufactured with a pHEMT process, 0.25µm gate length, via holes through the substrate, air bridges and electron beam gate lithography. 0dB state It is available in chip form. Main Features ■ Performances: 6-18GHz ■ 23dBm saturated output power ■ 16dB gain ■ 1 bit attenuator for 20dB dynamic range ■ DC power consumption: 210mA @ 4.5V ■ Chip size: 4.27 x 2.46 x 0.1mm 20dB state Typical on wafer Measurements Gain versus attenuation states Main Characteristics Tamb. = 25°C Symbol Parameter Min Typ Max Unit Fop Operating frequency range 6 18 GHz G Small signal gain @ Attenuator state 0dB 16 dB Psat Saturated Output power @ Attenuator state 0dB 23 dBm ATT dyn Attenuator range 20 dB ESD Protection: Electrostatic discharge sensitive device. Observe handling precautions ! Ref. DSCHA3512-8144 - 23 May 08 1/10 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 6-18GHz Digital Variable Amplifier CHA3512 Electrical Characteristics on wafer Tamb = +25°C Vd = Pads B, D = 4.5V, Vg = Pads A, C tuned for Id = 210mA Symbol Fop Parameter Min Operating frequency range (1) G 6 Small signal gain @ Attenuator state 0dB (1) ATT dyn Is Typ Max Unit 18 GHz 16 6-16GHz 14 16 dB 16-18GHz 10 13 Attenuator range 19 20 Isolation @ Attenuator state 0dB & switch OFF (1) -25 -35 dB 22 dB P1dB Output power at 1dB compression @ Attenuator state 0dB (1) 20 dBm Psat Saturated Output power @ Attenuator state 0dB (1) 23 dBm Noise figure @ Attenuator state 0dB 7 dB NF RL_IN Input Return Loss all attenuator states (switch ON) -15 -8 dB RL_OUT Output Return Loss all attenuator states (switch ON and switch OFF) -20 -6 dB Vd Drain bias DC voltage (Pads B, D) 4.5 Id Bias current @ small signal 210 Vc Control voltage for Attenuator bit & SPDT switch -5 V 250 mA 0 V (1) These values are representative for on-wafer measurements that are made without bonding wires at the RF ports. Ref. DSCHA3512-8144 - 23 May 08 2/10 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 6-18GHz Digital Variable Amplifier CHA3512 Absolute Maximum Ratings Tamb. = 25°C (1) Symbol Parameter Values Unit Vd Maximum Drain bias voltage ( Pads B, D) +5 V Id Drain bias current with Vd=4.5V 300 mA Vg Gate bias voltage (Pads A,C) -2 to +0.4 V Vc Attenuator bit & SPDT control voltage -7 to +0.6 V Pin Maximum input power overdrive (2) +20.0 dBm Tch Maximum channel temperature +175 °C Ta Operating temperature range -40 to +70 °C Storage temperature range -55 to +125 °C Tstg (1) Operation of this device above anyone of these parameters may cause permanent damage. (2) Duration < 1s. Thermal Resistance channel to ground paddle =123°C/W for Tamb. = +70°C. LNA Control interface The attenuator state is controlled by 2 voltages. The SPDT switch is controlled by 2 voltages. state 0 1 2 Theoretical attenuation Voltage CONTROL PAD Switch control (dB) 20A (V) 20B (V) E (V) F (V) 0 référence 20 Isolation -5 0 -5 0 -5 0 -5 -5 0 0 0 -5 Ref. : DSCHA3512-8144 - 23 May 08 3/10 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 6-18GHz Digital Variable Amplifier CHA3512 Typical on wafer Measurements @ 25°C Bias conditions: Vd = 4.5V, Vg tuned for Id = 210mA 0dB state 20dB state Linear Gain versus attenuator states Linear Gain with SPDT switch OFF Ref. DSCHA3512-8144 - 23 May 08 4/10 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 6-18GHz Digital Variable Amplifier Saturated output power@nominal state CHA3512 Attenuator accuracy versus frequency Switch OFF dB(S11) versus frequency for all states Ref. : DSCHA3512-8144 - 23 May 08 dB(S22) versus frequency for all states 5/10 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 6-18GHz Digital Variable Amplifier CHA3512 Typical test fixture Measurements @ 25°C Bias conditions: Vd = 4.5V, Vg tuned for Id = 210mA 0dB state 20dB state Switch OFF Linear Gain versus attenuation states Switch OFF Input Return Loss versus attenuation states Ref. DSCHA3512-8144 - 23 May 08 6/10 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 6-18GHz Digital Variable Amplifier CHA3512 Output Return Loss versus attenuation states Ref. : DSCHA3512-8144 - 23 May 08 7/10 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 CHA3512 6-18GHz Digital Variable Amplifier Typical Chip on wafer Sij parameters for reference state Tamb = +25°C, Vd = +4.5 V, Id = 210 mA , 0dB state (20A = -5V, 20B = 0V). Freq (GHz) dB(S11) P(S11) (°) dB(S21) P(S21) (°) dB(S12) P(S12) (°) dB(S22) P(S22) (°) 1.0 -5.5 -92.5 -20.7 161.9 -62.1 112.2 -0.5 -57.6 1.5 -8.0 -124.4 -2.7 69.1 -66.5 -40.1 -1.2 -85.9 2.0 -11.1 -149.5 0.3 94.1 -68.7 91.4 -1.5 -107.3 2.5 -13.9 -167.5 10.0 50.3 -64.9 14.8 -1.9 -132.8 3.0 -17.9 170.0 13.8 -2.9 -83.1 140.3 -2.8 -157.7 3.5 -25.6 167.5 15.6 -54.8 -87.8 39.6 -4.7 -175.7 4.0 -28.0 -112.8 16.3 -91.9 -73.1 116.8 -6.1 167.0 4.5 -20.8 -106.6 17.1 -127.4 -67.2 82.5 -8.0 152.1 5.0 -17.8 -121.1 17.6 -161.5 -63.8 57.4 -10.0 140.7 5.5 -16.9 -137.3 18.0 165.7 -61.5 22.6 -12.2 132.5 6.0 -17.4 -152.0 18.2 133.9 -60.0 -7.1 -14.5 127.7 6.5 -19.4 -161.4 18.3 103.0 -57.6 -33.7 -16.7 127.0 7.0 -22.7 -156.8 18.3 72.7 -56.5 -63.6 -18.7 129.8 7.5 -23.3 -123.6 18.2 43.1 -55.2 -89.9 -19.7 136.0 8.0 -19.3 -107.8 18.0 14.2 -54.0 -115.4 -20.2 140.3 8.5 -15.6 -107.5 17.8 -13.9 -53.6 -142.5 -21.1 137.2 9.0 -13.3 -118.9 17.5 -41.2 -53.7 -160.6 -21.5 132.1 9.5 -11.7 -131.3 17.3 -68.0 -52.6 -177.3 -22.9 127.6 10.0 -10.5 -147.0 17.1 -94.5 -51.6 153.2 -24.4 126.2 10.5 -10.2 -161.0 16.9 -120.6 -53.2 131.7 -26.5 125.0 11.0 -10.0 -174.3 16.9 -146.6 -53.3 114.2 -28.6 130.5 11.5 -10.1 172.0 16.9 -173.0 -53.7 99.0 -29.8 142.9 12.0 -10.4 157.6 17.0 159.8 -55.4 76.4 -29.7 148.2 12.5 -11.1 142.7 17.0 131.8 -59.3 61.7 -30.1 140.1 13.0 -12.4 125.9 17.0 102.9 -59.3 48.4 -32.0 109.0 13.5 -14.7 112.4 16.8 74.2 -62.4 -22.1 -34.9 37.3 14.0 -17.6 104.1 16.7 45.8 -59.0 -113.2 -29.6 -36.7 14.5 -20.9 107.6 16.6 16.4 -54.6 -169.8 -25.4 -71.4 15.0 -20.5 120.0 16.6 -14.5 -51.5 171.1 -24.5 -93.5 15.5 -18.4 113.6 16.4 -46.8 -48.0 149.4 -25.2 -99.5 16.0 -16.8 92.0 16.1 -80.4 -45.8 126.8 -25.9 -79.2 16.5 -15.7 63.4 15.5 -114.6 -43.8 100.8 -21.5 -60.8 17.0 -14.9 31.3 14.7 -148.5 -43.3 75.6 -15.9 -66.5 17.5 -14.5 2.8 14.0 175.9 -42.6 52.2 -12.2 -84.5 18.0 -13.8 -20.5 12.9 138.1 -42.4 25.5 -9.6 -106.7 18.5 -12.8 -39.8 11.3 98.1 -43.0 -5.1 -8.4 -131.5 19.0 -11.5 -57.4 8.9 59.2 -45.7 -39.8 -8.3 -154.4 19.5 -10.3 -75.6 6.0 23.7 -50.7 -77.9 -8.9 -174.8 20.0 -9.3 -93.4 3.2 -8.9 -60.5 -154.2 -10.2 167.0 20.5 -8.7 -110.5 0.8 -40.4 -57.9 108.5 -12.1 151.2 21.0 -8.4 -127.9 -0.9 -74.3 -50.5 78.2 -15.0 138.3 21.5 -8.4 -144.2 -1.8 -118.3 -47.7 52.1 -21.2 150.9 22.0 -8.6 -159.1 -3.7 176.5 -44.3 19.4 -15.1 -171.3 22.5 -8.9 -175.4 -8.9 108.2 -45.6 -14.4 -12.2 157.4 23.0 -9.5 167.6 -13.6 57.0 -47.3 -35.8 -12.7 134.3 23.5 -10.4 150.2 -16.4 15.7 -49.2 -46.6 -13.9 117.4 24.0 -11.6 130.5 -18.1 -17.7 -52.6 -62.7 -15.2 103.7 Ref. DSCHA3512-8144 - 23 May 08 8/10 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 6-18GHz Digital Variable Amplifier CHA3512 Chip Assembly and Mechanical Data To Vd DC Drain Supply RF IN1 RF OUT RF IN2 Note: RF wire bondings should be as short as possible, lower than 0.35mm. 25µm diameter gold wire is to be prefered. Recommended circuit bonding table Label 20A, 20B B D A C E, F Type Vc Vd Vd Vg Vg Vc Ref. : DSCHA3512-8144 - 23 May 08 Decoupling Comment Not required 120pF / 10nF 120pF / 10nF Not required Not required Not required 9/10 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 20dB attenuator control Drain Supply Drain Supply Gate Supply Gate Supply Switch control Specifications subject to change without notice 6-18GHz Digital Variable Amplifier CHA3512 Bonding pad positions Chip thickness: 100µm Ordering Information Chip form : CHA3512-99F/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. DSCHA3512-8144 - 23 May 08 10/10 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