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CHT4690
RoHS COMPLIANT
5-30GHz ATTENUATOR
GaAs Monolithic Microwave IC Description
The CHT4690 is a variable 5-30GHz 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, 0.7m gate length, via holes through the substrate and air bridges. It is supplied in chip form.
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Main Features
| Broadband performance : 5-30GHz | 25dBm typical input 1dB compression point (any attenuation) | 30dB dynamic range | DC bias : -5VMain Characteristics
Tamb. = 25C Symbol
Fin Min Att. Max Att. Pin1dB
Parameter
Input frequency range |S21| (V1=-5V;V2=-5V) (5 to 20GHz) |S21| (V1=0V;V2=0V) (10 to 30GHz) Input 1dB compression point (any attenuation)
Min
5
Typ
Max
30
Unit
GHz dB dB dBm
-3 -30 25
ESD Protection : Electrostatic discharge sensitive device. Observe handling precautions !
Ref. : DSCHT46905334 - 29 Nov 05 1/13 Specifications subject to change without notice
United Monolithic Semiconductors S.A.S.
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
CHT4690
Electrical Characteristics
Tamb. = 25C Symbol
Fin Min Att. Input frequency range |S21| (V1=-5V;V2=-5V) ( 5 to 12GHz) |S21| (V1=-5V;V2=-5V) ( 13 to 30GHz) Max Att. |S21| (V1=0V;V2=0V) (5 to 12GHz) |S21| (V1=0V;V2=0V) (13 to 30GHz) VSWRin VSWRout Pin1dB C/I3 Input VSWR (any attenuation) ( 5 to 30GHz) Output VSWR (any attenuation) ( 8 to 30GHz)
5-30GHz Attenuator
Parameter
Min
5
Typ
Max
30
Unit
GHz dB dB dB dB
-2.5 -6.5 -25 -34
-3 -7.5
2.3:1 2.5:1 25 40 dBm dB
Input 1dB compression point (any attenuation) (5 to 20GHz) C/I3 @ Pin/tone=12dBm (any attenuation) (up to 26GHz)
ESD Protection : Electrostatic discharge sensitive device. Observe handling precautions !
Absolute Maximum Ratings (1)
Tamb. = 25C Symbol V1 V2 Pin Ta Tstg (1) V1 control voltage V2 control voltage RF input power Operating temperature range Storage temperature range Parameter Values -6V -6V 30 -40 to +85 -55 to +155 Unit V V dBm C C
Operation of this device above anyone of these parameters may cause permanent damage.
Typical Bias Conditions
for an ambient Temperature of +25C Symbol V1 V2 V1 control voltage V2 control voltage
2/13
Parameter
Values -5 to 0 -5 to 0
Unit V V
Ref. : DSCHT46905334 - 29 Nov 05
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
CHT4690
Typical results
Chip Typical Response ( On wafer Sij ) : Tamb = +25C V1 = -5V & V2= -5V
Freq (GHz) 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 dBS11 (dB) -6.29 -13.90 -33.49 -18.92 -15.43 -13.73 -15.09 -16.08 -16.59 -16.95 -14.53 -13.73 -12.55 -11.30 -11.29 -11.56 -14.44 -18.03 -31.46 -15.91 -11.85 -11.09 -12.09 -13.45 -15.14 -20.61 -22.21 -13.40 -9.33 -9.26 -9.16 -10.96 -15.41 -24.19 -14.66 -10.13 -8.18 -7.36 -7.57 PhS11 () -104.78 -142.32 103.94 -5.76 -27.95 -53.65 -68.43 -74.62 -73.62 -64.41 -70.07 -75.66 -82.11 -89.63 -108.06 -127.91 -138.27 -154.90 -65.09 -56.73 -81.87 -104.33 -121.81 -129.91 -142.57 -151.15 -48.69 -56.86 -83.86 -107.23 -124.74 -143.12 -159.05 -104.04 -71.35 -86.82 -105.93 -123.76 -143.67 dBS12 (dB) -2.01 -1.08 -1.27 -1.42 -1.52 -1.94 -1.58 -1.72 -1.86 -2.11 -2.26 -2.50 -2.82 -3.08 -3.06 -3.17 -3.19 -3.42 -3.15 -3.11 -3.65 -4.13 -4.38 -4.60 -4.93 -4.98 -5.19 -5.84 -6.53 -6.86 -7.10 -6.87 -6.31 -5.88 -5.85 -6.58 -7.22 -7.60 -7.27 PhS12 () -9.01 -46.74 -78.74 -104.45 -131.80 -155.91 179.46 153.40 127.70 103.34 78.02 53.37 29.21 7.21 -16.89 -38.98 -63.43 -85.65 -107.92 -135.35 -160.66 176.26 153.99 130.21 105.98 81.66 53.71 26.74 1.04 -23.20 -48.20 -72.14 -99.51 -128.72 -159.29 173.48 150.56 131.28 115.53 dBS21 (dB) -1.98 -1.04 -1.25 -1.38 -1.49 -1.89 -1.55 -1.68 -1.80 -2.04 -2.20 -2.44 -2.76 -3.02 -3.00 -3.12 -3.14 -3.37 -3.09 -3.06 -3.62 -4.05 -4.32 -4.54 -4.87 -4.90 -5.14 -5.76 -6.47 -6.81 -7.04 -6.79 -6.23 -5.81 -5.77 -6.50 -7.12 -7.49 -7.17
5-30GHz Attenuator
PhS21 () -9.34 -47.05 -79.12 -104.65 -131.98 -156.07 179.18 153.18 127.51 103.15 77.64 53.10 28.89 6.92 -17.20 -39.35 -63.66 -85.77 -108.07 -135.53 -160.76 176.14 153.77 129.98 105.80 81.38 53.38 26.39 0.67 -23.52 -48.73 -72.51 -99.96 -129.15 -159.70 173.15 150.10 131.09 115.09
dBS22 (dB) -6.22 -13.82 -27.95 -19.19 -14.88 -14.92 -15.12 -19.19 -26.46 -19.90 -15.17 -12.54 -10.75 -9.48 -9.80 -10.69 -12.57 -17.85 -24.60 -15.74 -11.06 -9.92 -9.57 -10.03 -11.49 -13.59 -14.94 -13.19 -11.12 -10.14 -9.70 -11.28 -13.59 -23.56 -22.62 -13.93 -11.22 -10.42 -9.23
PhS22 () -97.53 -126.13 -69.61 -18.49 -52.69 -74.29 -102.17 -140.64 148.17 42.75 4.12 -20.65 -41.79 -62.60 -84.27 -104.87 -123.19 -136.13 -74.92 -46.79 -67.33 -88.92 -105.06 -120.22 -132.20 -133.90 -123.67 -115.78 -124.99 -136.08 -155.88 -173.54 160.74 143.93 -104.16 -110.93 -138.54 -158.76 176.23
Ref: DSCHT46905334 - 29 Nov 05
3/13
Specifications subject to change without notice
Route Departementale 128 - B.P.46 - Tel.. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69. 33 03 09
5-30GHz Attenuator
V1 = 0V & V2= 0V
Freq (GHz) 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 dBS11 (dB) -4.44 -7.20 -9.10 -10.80 -12.09 -12.93 -13.99 -14.44 -14.69 -14.72 -14.91 -14.90 -15.05 -15.44 -15.91 -16.49 -17.20 -17.85 -19.65 -21.55 -24.36 -27.84 -31.47 -33.10 -29.54 -28.46 -27.50 -26.66 -24.45 -24.56 -25.41 -25.09 -26.83 -28.46 -27.53 -27.82 -26.79 -25.83 -21.50 PhS11 () -143.24 -171.22 174.49 164.52 159.75 156.90 154.84 154.65 154.72 151.66 150.39 146.38 141.41 134.90 127.63 121.21 112.41 101.71 85.00 71.59 50.12 26.69 -8.22 -47.36 -67.08 -98.46 -97.94 -105.16 -120.07 -139.96 -148.35 -152.31 -175.25 168.50 140.64 106.98 80.89 57.55 51.16 dBS12 (dB) -19.44 -20.89 -23.49 -25.09 -26.99 -28.74 -30.05 -31.34 -32.15 -33.42 -33.25 -34.01 -34.69 -35.49 -35.48 -35.64 -37.09 -35.96 -34.60 -35.62 -35.06 -34.63 -34.59 -34.97 -36.67 -35.44 -37.59 -37.41 -36.45 -38.67 -38.96 -38.69 -39.68 -44.22 -57.99 -51.31 -40.98 -35.91 -32.54 PhS12 () -26.13 -76.86 -113.84 -145.87 -173.25 160.34 136.61 112.68 90.56 71.27 49.61 29.42 10.49 -9.63 -22.24 -38.98 -55.23 -62.20 -84.28 -104.90 -121.53 -142.27 -161.79 176.00 170.42 152.57 134.66 137.29 118.83 102.14 107.86 93.25 75.15 42.32 14.39 -100.68 -130.65 -158.28 -174.93 dBS21 (dB) -19.40 -20.86 -23.47 -25.05 -26.95 -28.69 -30.01 -31.30 -32.10 -33.35 -33.19 -33.95 -34.61 -35.42 -35.33 -35.50 -37.06 -35.97 -34.55 -35.48 -34.97 -34.55 -34.52 -34.95 -36.60 -35.32 -37.42 -37.37 -36.43 -38.69 -38.89 -38.58 -39.48 -44.23 -57.42 -51.46 -40.84 -35.85 -32.44 PhS21 () -26.38 -77.07 -114.12 -146.02 -173.28 160.31 136.37 112.60 90.54 71.25 49.38 29.35 10.53 -9.82 -22.55 -39.00 -55.58 -62.19 -84.31 -104.90 -121.54 -142.68 -162.19 176.30 170.40 152.17 134.22 136.97 118.60 101.74 107.48 93.33 75.61 40.54 15.21 -100.36 -130.90 -158.46 -174.88
CHT4690
dBS22 (dB) -2.40 -3.79 -4.82 -5.67 -6.45 -7.04 -7.72 -8.25 -8.84 -9.35 -10.10 -10.42 -10.97 -11.41 -11.81 -12.21 -12.61 -13.29 -14.01 -14.15 -14.66 -14.93 -15.47 -15.86 -16.13 -16.87 -16.78 -17.33 -17.65 -17.51 -17.68 -17.01 -16.68 -16.74 -15.91 -15.24 -14.40 -14.25 -13.39 PhS22 () -126.78 -155.50 -173.85 172.68 162.93 154.27 147.14 140.61 134.77 129.86 125.48 122.02 117.52 113.26 108.79 104.88 98.91 95.15 90.96 88.83 83.28 81.81 77.97 74.21 68.56 64.47 62.16 59.71 62.80 57.70 60.32 50.49 54.96 48.74 53.83 45.02 42.19 35.29 44.33
Ref. : DSCHT46905334 - 29 Nov 05
4/13
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
CHT4690
Typical Results on wafer
Tamb = +25C
5-30GHz Attenuator
Attenuation versus frequency
V1 = -5V to 0V & V2= -5V and after V1= 0V & V2 = -5V to 0V
Ref: DSCHT46905334 - 29 Nov 05
5/13
Specifications subject to change without notice
Route Departementale 128 - B.P.46 - Tel.. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69. 33 03 09
5-30GHz Attenuator
CHT4690
Input Return loss versus frequency in total attenuation range
Output Return loss versus frequency in total attenuation range
Ref. : DSCHT46905334 - 29 Nov 05
6/13
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
CHT4690
Attenuation control at 5GHz
0
5-30GHz Attenuator
-5
-10
-15
Attenuation (dB)
-20
-25
-30
-35
-40
V1 variable with V2=-5V V2 variable with V1=0V
-45
-50
-5,0
-4,5
-4,0
-3,5
-3,0
-2,5
-2,0
-1,5
-1,0
-0,5
0,0
Voltage V1 or V2 (V)
Attenuation control at 15GHz
Ref: DSCHT46905334 - 29 Nov 05
7/13
Specifications subject to change without notice
Route Departementale 128 - B.P.46 - Tel.. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69. 33 03 09
5-30GHz Attenuator
0 -5 -10 -15 Attenuation (dB) -20 -25 -30 -35 -40 -45 -50 -5,0
V1 variable with V2=-5V V2 variable with V1=0V
CHT4690
-4,5
-4,0
-3,5
-3,0
-2,5
-2,0
-1,5
-1,0
-0,5
0,0
Voltage V1 or V2 (V)
Attenuation control at 25GHz
0
-5
-10
-15
Attenuation (dB)
-20
-25
-30
-35
-40
V1 variable with V2=-5V V2 variable with V1=0V
-45
-50
-5,0
-4,5
-4,0
-3,5
-3,0
-2,5
-2,0
-1,5
-1,0
-0,5
0,0
Voltage V1 or V2 (V)
Ref. : DSCHT46905334 - 29 Nov 05
8/13
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
CHT4690
5-30GHz Attenuator
Attenuation versus input power @ 20GHz
V1 = -5V to 0V & V2= -5V and after V1= 0V & V2 = -5V to 0V
Input IP3 versus input power
V1 = -3.5V & V2= -5V (worst case area for the linearity)
Ref: DSCHT46905334 - 29 Nov 05
9/13
Specifications subject to change without notice
Route Departementale 128 - B.P.46 - Tel.. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69. 33 03 09
5-30GHz Attenuator
45
CHT4690
40
Input IP3 (dB)
35
30 15 GHz 26 GHz 25
20 -2 0 2 4 6 8 10 12 14 16 18 20
Single input power (dBm)
C/I3 versus input power V1 = -3.5V & V2= -5V (worst case area for the linearity)
Ref. : DSCHT46905334 - 29 Nov 05 10/13 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
CHT4690
60
5-30GHz Attenuator
55
50
C/I3 (dB)
45
40
15 GHz 26 GHz
35
30 -2 0 2 4 6 8 10 12 14 16 18 20
Single input power (dBm)
Ref: DSCHT46905334 - 29 Nov 05
11/13
Specifications subject to change without notice
Route Departementale 128 - B.P.46 - Tel.. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69. 33 03 09
5-30GHz Attenuator
CHT4690
Biasing sequence
To obtain good performances in linearity, biasing voltage should be applied as following: Control of 1st stage attenuation with V1 from -5V to 0V, with V2 fixed at -5V Control of 2nd stage with V2 from -5V to 0V, with V1 fixed at 0V
RF IN
...
... ...
...
RF OUT
V1
V2
Chip Assembly and Mechanical Data
.. ..
.. ..
120 pF
120 pF
to V1 DC gate supply feed
to V2 DC gate supply feed
Note : Supply feed might be capacitively bypassed. 25m diameter gold wire is to be prefered.
Ref. : DSCHT46905334 - 29 Nov 05
12/13
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
CHT4690
5-30GHz Attenuator
Bonding pad positions.
( Chip thickness : 100m. All dimensions are in micrometers )
Ordering Information
Chip form : CHT4690-99F/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: DSCHT46905334 - 29 Nov 05 13/13 Specifications subject to change without notice
Route Departementale 128 - B.P.46 - Tel.. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69. 33 03 09

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