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, 0.7µm 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 : -5V<V1<0V ; -5V<V2<0V
Main Characteristics
Tamb. = 25°C
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 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
CHT4690
Electrical Characteristics
Tamb. = 25°C
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. = 25°C
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 +25°C
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 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
CHT4690
Typical results
Chip Typical Response ( On wafer Sij ) :
Tamb = +25°C
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 Départementale 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 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
CHT4690
Typical Results on wafer
Tamb = +25°C
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 Départementale 128 - B.P.46 - Tel.. : +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69. 33 03 09
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