AN0010
CHA2069QDG 17-20GHZ
CHA2069QDG
Recommended external matching
network in the 17-20 GHz band
The following is an application note in order to improve the performances of the
product for the dedicated 17-20GHZ frequency band using simple external matching
networks.
Ref. : AN00106080 - 21 Mar 06
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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
17-20GHz Application Note
CHA2069QDG
Description
The CHA2069QDG is a three-stage self-biased wide band monolithic low
noise amplifier. Typical applications range from telecommunication (point
to point, point to multi-point, VSAT) to ISM and military markets.
The circuit is manufactured with a standard P-HEMT process: 0.25µm
gate length, via holes through the substrate, air bridges and electron
beam lithography.
It is supplied in RoHS compliant SMD package.
Main Features
■ Broadband performances :
18-30GHz
■ 3dB noise figure
■ 20dB gain
■ 65mA low DC power consumption
■ 20dBm 3rd order intercept point (high current configuration)
■ Package type : 24 leads QFN4x4. :
External matching
The 24Leads QFN4x4 is an SMD type package. Therefore, a suitable
motherboard environment is chosen. All tests and verifications are
performed on Rogers RO4003 (or equivalent). This material exhibits a
permittivity of 3.38 and is used with a thickness of 200µm (8 mils) and a
1/2oz or less copper cladding. The corresponding 50 Ohm transmission
line has a strip width of about 460µm (approx. 18 mils).
When using this circuit in a reduced bandwidth, such as in the 17 to
20GHz frequency range, the performances of the circuit could be
improved using external (on board) matching stubs and slugs. This
board pattern is easily computed from the Sij of the package product as
given in the data-sheet (and in the section below) with any CAD
software, using the material defined above for the motherboard. The
following give results obtained at UMS, based on the given motherboard
layout.
Ref. AN00106080 - 21 Mar 06
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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
17-20GHz Application Note
CHA2069QDG
Typical Sij for low current configuration (without external matching)
Tamb = +25°C, Vd = +4,5V Pads: B,D,E grounded.
F (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
S11
dB
-0.1
-0.1
-0.1
-0.2
-0.4
-0.6
-1.2
-1.8
-2.8
-4.0
-5.7
-8.8
-15.8
-17.4
-10.9
-8.5
-7.0
-6.2
-5.8
-4.9
-4.7
-4.3
-3.9
-3.8
-3.3
-3.0
-2.5
-2.5
-2.8
-3.9
-2.8
S11
/°
-58.7
-89.3
-123.5
-160.8
156.1
107.6
58.9
13.5
-26.1
-58.0
-89.1
-122.0
-173.9
24.9
-20.6
-47.1
-65.5
-82.8
-98.4
-110.8
-125.9
-138.7
-152.2
-163.2
-173.7
175.5
166.4
155.4
146.3
144.4
154.3
S12
dB
-95.2
-68.8
-63.2
-62.9
-58.1
-67.5
-68.1
-61.6
-60.0
-55.1
-53.4
-49.6
-50.5
-48.2
-48.3
-49.6
-47.3
-44.9
-42.5
-43.2
-45.3
-43.3
-43.7
-44.2
-45.4
-46.5
-43.7
-43.2
-42.0
-46.4
-47.9
S12
/°
-85.6
63.3
93.4
47.1
11.4
-59.7
93.7
-9.2
-42.6
171.8
87.2
14.1
-42.8
-120.3
171.6
133.4
121.9
92.5
57.3
20.1
14.9
-0.5
-14.8
-36.7
-48.5
-43.8
-45.2
-59.5
-81.7
-112.7
-148.6
S21
dB
-57.5
-77.6
-52.9
-37.4
-18.1
-4.4
4.4
9.6
14.7
19.0
21.7
23.3
24.0
23.5
22.4
21.5
20.9
20.8
20.7
20.9
20.9
20.9
20.4
19.6
18.8
17.8
17.1
16.8
17.3
18.0
17.2
S21
/°
-2.4
-24.4
62.8
145.3
93.6
28.0
-52.1
-122.4
176.1
109.4
41.3
-24.1
-86.8
-146.2
162.0
116.9
75.8
34.2
-6.5
-48.3
-90.8
-135.3
178.7
135.8
92.8
52.7
13.2
-26.3
-69.6
-123.9
168.4
S22
dB
-0.6
-0.9
-0.9
-1.3
-1.7
-2.0
-3.0
-3.9
-4.4
-8.3
-13.4
-17.0
-12.6
-8.3
-6.3
-5.9
-5.9
-6.1
-7.2
-7.9
-9.2
-8.7
-7.6
-6.3
-4.4
-3.7
-3.0
-2.7
-2.7
-2.6
-2.5
Refer to the “definition of the Sij reference planes” section below
Ref. : AN00106080 - 21 Mar 06
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S22
/°
-148.4
157.1
112.4
72.0
39.9
8.4
-20.2
-38.6
-69.5
-92.5
-92.8
-67.1
-36.0
-46.7
-65.3
-85.2
-99.8
-116.0
-130.1
-137.3
-142.4
-139.3
-141.9
-148.5
-156.9
-169.0
-179.9
171.2
161.4
156.1
150.5
CHA2069QDG
17-20GHz Application Note
Typical Sij for high current configuration
(without external matching)
Tamb = +25°C, Vd = +4,5V Pads: B,C,F grounded.
F (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
S11
dB
-0.1
-0.1
-0.1
-0.2
-0.4
-0.7
-1.3
-1.8
-2.9
-4.0
-5.6
-8.5
-14.6
-19.5
-11.3
-8.5
-6.9
-6.1
-5.6
-4.6
-4.4
-4.1
-3.7
-3.8
-3.5
-3.3
-3.0
-2.9
-2.9
-3.8
-2.7
S11
/°
-58.5
-88.9
-122.6
-159.2
158.4
110.4
60.8
13.6
-27.8
-60.9
-92.1
-123.1
-169.0
26.2
-23.8
-49.1
-67.5
-83.9
-97.1
-109.1
-123.2
-135.7
-149.8
-162.0
-173.4
174.4
164.8
153.8
143.4
138.2
145.3
S12
dB
-92.2
-67.1
-62.8
-63.0
-56.6
-64.5
-67.3
-61.5
-59.6
-54.4
-53.9
-50.6
-52.1
-50.3
-49.4
-50.9
-46.9
-44.9
-43.0
-44.1
-45.4
-43.9
-43.4
-44.3
-44.5
-47.4
-44.8
-43.6
-41.7
-44.6
-49.9
S12
/°
81.8
55.2
100.3
51.4
15.4
-49.7
88.2
-7.6
-45.7
176.7
99.3
22.2
-32.8
-120.6
165.3
132.8
122.6
88.3
53.7
21.4
19.8
7.2
-10.0
-34.6
-42.2
-45.9
-39.0
-43.1
-66.2
-91.4
-140.7
S21
dB
-57.9
-69.1
-51.5
-37.2
-17.7
-3.8
5.3
10.6
15.6
19.9
22.7
24.2
25.1
24.8
23.6
22.6
21.8
21.5
21.2
21.3
21.3
21.4
21.0
20.3
19.7
18.7
18.0
17.6
18.0
18.4
17.8
S21
/°
0.4
-41.4
77.3
145.1
97.4
31.4
-49.4
-120.9
177.2
110.8
43.0
-22.2
-84.9
-145.6
161.3
115.2
73.8
32.7
-7.8
-48.7
-90.2
-133.4
-178.9
138.4
94.7
53.4
12.8
-27.1
-70.8
-123.8
169.5
S22
dB
-0.7
-1.1
-1.0
-1.5
-1.9
-2.2
-3.4
-4.6
-4.8
-8.5
-12.5
-16.3
-13.8
-8.9
-6.5
-6.0
-5.8
-6.1
-7.0
-7.6
-9.0
-9.4
-8.8
-7.6
-5.5
-4.5
-3.6
-3.0
-2.6
-2.6
-2.6
Refer to the “definition of the Sij reference planes” section below
Ref. : AN00106080 - 21 Mar 06
4/12
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
S22
/°
-146.6
159.3
114.1
73.0
40.1
8.3
-21.8
-40.0
-68.3
-89.9
-90.4
-76.8
-40.8
-46.4
-65.0
-86.1
-101.6
-119.7
-134.2
-144.5
-153.5
-152.7
-151.9
-155.6
-161.7
-172.3
177.3
168.4
158.1
150.7
144.6
CHA2069QDG
17-20GHz Application Note
Definition of the Sij reference planes
The reference planes are defined from the footprint of the recommended
characterization board 95541 (see data-sheet).
The reference is the symmetrical axis of the package. The input and
output reference planes are located at 3.18mm offset (input wise and
output wise respec.) from this axis. Then, the given Sij incorporates this
land pattern.
3.18
Ref. : AN00106080 - 21 Mar 06
3.18
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Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
Specifications subject to change without notice
CHA2069QDG
17-20GHz Application Note
Proposed Assembly board “95958” for the 17-20GHz operation
-
-
Compatible with the proposed foot print (see datasheet).
Based on typically Ro4003 / 8mils or equivalent.
Using a microstrip to coplanar transition to access the package.
Recommended for the implementation of this product on a module board.
Ref. : AN00106080 - 21 Mar 06
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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
CHA2069QDG
17-20GHz Application Note
Dimension table for assembly board “95958”.
W_out
W_in
D_in
D_out
H_in
H_out
CHA2069
QDG
IN
OUT
Footprint
17-20GHz
D_in
(µm)
W_in
(µm)
H_in
(µm)
D_out
(µm)
W_out
(µm)
H_out
(µm)
4460
3300
500
4760
750
800
Ref. : AN00106080 - 21 Mar 06
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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
CHA2069QDG
17-20GHz Application Note
Typical PCB Measured Performance
Tamb = +25°C, Vd = +4,5V
Typical S parameters with matching network for the 17-20GHz band
Config. Low current (BDE grounded)
Narrow frequency band
25
20
S21
15
Sij (dB)
10
5
0
S11
-5
-10
-15
S22
-20
17
17.5
18
18.5
19
19.5
20
Frequency (GHz)
Sij using the proposed land pattern and board 95958 with SSMA connectors.
Sij in the package access plan
Typical S parameters with matching network for the 17-20GHz band
Config. Low current (BDE grounded)
Wide frequency range
25
S21
20
15
Sij (dB)
10
5
S11
0
-5
-10
-15
S22
-20
0
5
10
15
20
25
30
Frequency (GHz)
Sij using the proposed land pattern and board 95958 with SSMA connectors.
Sij in the package access plan
Ref. : AN00106080 - 21 Mar 06
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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
CHA2069QDG
17-20GHz Application Note
Typical PCB Measured Performance
Tamb = +25°C, Vd = +4,5V
Typical S parameters with matching network for the 17-20GHz band
Config. High current (BCFgrounded)
Narrow frequency band
25
20
S21
15
Sij (dB)
10
5
0
S11
-5
-10
-15
S22
-20
17
17.5
18
18.5
19
19.5
20
Frequency (GHz)
Sij using the proposed land pattern and board 95958 with SSMA connectors.
Sij in the package access plan
Typical S parameters with matching network for the 17-20GHz band
Config. High current (BCFgrounded)
Wide frequency range
25
S21
20
15
Sij (dB)
10
5
S11
0
-5
-10
-15
S22
-20
0
5
10
15
20
25
30
Frequency (GHz)
Sij using the proposed land pattern and board 95958 with SSMA connectors.
Sij in the package access plan
Ref. : AN00106080 - 21 Mar 06
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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
CHA2069QDG
17-20GHz Application Note
Typical PCB Measured Performance
Tamb = +25°C, Vd = +4,5V
Typical Output 1 dB compression
with the Matching Network for the 17-20GHz Band
20
high current (BCFgrounded)
Ouput P1dB (dBm)
18
16
14
12
10
8
low current (BDE grounded)
6
4
2
0
17
17.5
18
18.5
19
19.5
20
Frequency (GHz)
Output P1dB using the proposed land pattern and board 95958 with SSMA connectors
Ref. : AN00106080 - 21 Mar 06
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Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
Specifications subject to change without notice
CHA2069QDG
17-20GHz Application Note
Typical PCB Measured Performance
Tamb = +25°C, Vd = +4,5V
Typical Output IP3 vs Frequency @ Pout/tone=-5 dBm
30
Config. High current
(BCF grounded)
Output IP3 (dBm)
25
20
Config. low current
(BDE grounded)
15
10
5
0
17.5
18
18.5
19
19.5
20
Frequency (GHz)
Output IP3 using the proposed land pattern and board 95958 with SSMA connectors
Typical C/I3 vs Pout/tone @ low current configuration
(BDE grounded)
Typical C/I3 vs Pout/tone @ high current configuration
(BCF grounded)
60
60
50
50
40
C/I3 (dB)
C/I3 (dB)
40
18GHz
30
18.5GHz
19GHz
20
18GHz
18.5GHz
30
19GHz
19.5GHz
20
19.5GHz
20GHz
20GHz
10
10
0
-10
-8
-6
-4
-2
0
2
4
6
8
10
0
-10
Pout/tone (dBm)
-8
-6
-4
-2
0
2
4
6
8
Pout/tone (dBm)
C/I3 using the proposed land pattern and board 95958 with SSMA connectors
Ref. : AN00106080 - 21 Mar 06
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Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
Specifications subject to change without notice
10
17-20GHz Application Note
CHA2069QDG
Typical Electrical Characteristics summary :
Low current configuration
Tamb = +25°C, Vd = +4,5V Pads: VgB,VgD,VgE=GND
Symbol
Fop
G
Parameter
Operating frequency range
Gain
17-20
Unit
GHz
20.5
dB
∆G
Gain flatness
±1
dB
NF
Noise figure
3
dB
IS11I
Input return loss
-10
dB
IS22I
Ouput return loss
-12
dB
3rd order intercept point (Pout/tone=-5dBm)
21.5
dBm
Output power at 1dB gain compression
11
dBm
Drain bias current
65
mA
17-20
Unit
GHz
21.5
dB
IP3
P1dB
Id
High current configuration
Tamb = +25°C, Vd = +4,5V Pads: VgB,VgC,VgF=GND
Symbol
Fop
G
Parameter
Operating frequency range
Gain
∆G
Gain flatness
±1
dB
NF
Noise figure
3
dB
IS11I
Input return loss
-10
dB
IS22I
Ouput return loss
-12
dB
3rd order intercept point (Pout/tone=-5dBm)
23
dBm
Output power at 1dB gain compression
14
dBm
Drain bias current
85
mA
IP3
P1dB
Id
Ref. : AN00106080 - 21 Mar 06
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Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09
Specifications subject to change without notice