CHA2294
RoHS COMPLIANT
35-40GHz Low Noise, Variable Gain Amplifier
GaAs Monolithic Microwave IC
Description
The CHA2294 is a high gain
four-stage
monolithic low noise amplifier with variable gain.
It is designed for a wide range of applications,
from military to commercial communication
systems.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.
It is available in chip form.
26
24
22
20
18
16
14
12
10
8
6
4
2
0
35
36
Main Features
Frequency range: 35-40GHz
4.0dB Noise Figure.
22dB gain
Gain control range: 15dB
Low DC power consumption, 120mA @ 5V
Chip size: 2.32 X 1.235 X 0.10 mm
Gain (dB)
NF (dB)
37
38
Frequency (GHz)
39
40
Typical on wafer measurements :Gain & NF
Main Characteristics
Tamb. =25°
C
Symbol
Fop
G
NF
Gctrl
Id
Small signal gain
Noise figure
Gain control range with Vc variation
Bias current
10
Parameter
Operating frequency range
Min
35
20
Typ
22
4
15
120
Max
40
Unit
GHz
dB
4.5
dB
dB
mA
ESD Protection : Electrostatic discharge sensitive device. Observe handling precaution
Ref. : DSCHA22947165 - 14 Jun 07
1/6
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
35-40GHz LNA VGA
Electrical Characteristics for Broadband Operation
Tamb = +25° V5=Vd2=Vd,3,4=5V
C,
Symbol
Fop
G
∆G
Is
NF
Gctrl
P1dB
VSWRin
CHA2294
Parameter
Operating frequency range
Small signal gain (1)
Small signal gain flatness (1)
Reverse isolation (1)
Noise figure with Vc=1.2V
Gain control range versus Vc
Output power at 1dB compression with Vc=1.2V
Input VSWR (1)
Min
35
20
Typ
Max
40
Unit
GHz
dB
dB
dB
22
±1.0
50
4
4.5
dB
dB
dBm
10
15
11
2.0:1
1.5:1
VSWRout Output VSWR (1)
Vd
DC voltage
V5= Vd2=Vd3,4
Vc
5
[-0.7, +1.2]
20
120
-1.5
+1.3
V
V
mA
mA
Id1
Id
Bias current (2) with Vc=1.2V
Bias current total (3) with Vc=1.2V
(1) These values are representative of on-wafer measurements that are made without bonding
wires at RF ports.
(2) For optimum noise figure, the bias current Id1 should be adjust to 20mA with Vg1 voltage.
(3) With Id1=20mA, adjust Vg2,3,4 voltage for a total drain current around 120mA.
Absolute Maximum Ratings
Tamb. =25° (1)
C
Symbol
Vd
Id
Vg
Vc
Vdg
Pin
Tch
Ta
Tstg
Parameter
Values
+5.2
200
-2.5 to +0.4
+1.5
+5.0
+15
+175
-40 to +85
-55 to +125
Unit
V
mA
V
V
V
dBm
°
C
°
C
°
C
Maximum Drain bias voltage
Maximum drain bias current
Gate bias voltage
Maximum Control bias voltage
Maximum drain to gate voltage (Vd - Vg)
Maximum input power overdrive (2)
Maximum channel temperature
Operating temperature range
Storage temperature range
(1) Operation of this device above anyone of these parameters may cause permanent damage.
(2) Duration < 1s.
Ref. : DSCHA22947165 - 14 Jun 07
2/6
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
35-40GHz LNA VGA
Typical on wafer Measurements
CHA2294
Bias Conditions : V5=Vd2=Vd3,4=5V, Vg1 for Id1=20mA, Vg2=Vg3,4=-0.3V,
Vc=+1.2V
26
24
22
20
18
16
14
12
10
8
6
4
2
0
35
36
Gain (dB)
NF (dB)
37
38
Frequency (GHz)
39
40
Gain & Noise Figure versus frequency
25
20
15
10
5
0
-5
-10
-15
-20
-25
30
32
34
36
Frequency (GHz)
Gain & Return Loss versus frequency
Ref. : DSCHA22947165 - 14 Jun 07
3/6
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
S21 (dB)
S11 (dB)
S22 (dB)
38
40
35-40GHz LNA VGA
In jig Measurements
Bias Conditions :
28
27
26
25
Gain (dB)
24
23
22
21
20
19
18
CHA2294
V5=Vd2=Vd3,4=5V, Vg1=Vg2=Vg3,4 =-0.3V, Vc=+1.2V
36GHz
39GHz
-2
0
2
37GHz
40GHz
4
6
8
Output Power (dBm)
38GHz
10
12
14
Gain versus Output power
28
26
24
22
20
18
16
14
12
10
36
37
38
Frequency (GHz)
39
40
P-1dB (dBm)
Linear Gain (dB)
Linear Gain & Output power @ 1dB compression versus frequency
Ref. : DSCHA22947165 - 14 Jun 07
4/6
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
35-40GHz LNA VGA
CHA2294
Gain versus frequency and Vc
Chip Assembly and Mechanical Data
To V5 DC Drain supply feed
To Vd2,3,4 DC Drain supply
feed
120pF
120pF
RF In
RF Out
120pF
120pF
120pF
To Vg1 DC Gate supply feed
To Vc DC supply feed
To Vg2,3,4 DC Gate supply feed
Note : Supply feed should be capacitively bypassed. 25µm diameter gold wire is recommended
Bond Pad:100 x 100 µm
Ref. : DSCHA22947165 - 14 Jun 07
5/6
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
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