CHA3694
RoHS COMPLIANT
31-40GHz Variable Gain Amplifier
GaAs Monolithic Microwave IC
Description
The CHA3694 is a variable gain broadband
three-stage monolithic amplifier. It is designed
for a wide range of applications, typically
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 power
pHEMT process, 0.15µm gate length, via
holes through the substrate and air bridges.
It is supplied in chip form.
On-Wafer Measurements
Vd
RFin
…
RFout
Vctrl
Vg
Main Features
Linear Gain (dB)
22
18
14
10
6
2
-2
-6
-10
-14
-18
30
31
32
33
34
35
36
37
38
39
40
41
42
■
Broadband performance 31-40GHz
■
17dB gain
■
25dBm output IP3
■
26dB gain control range
■
ESD protected (see page 11)
■
DC power consumption: 3.5V, 160mA
■
Chip size: 2.41 x 2.08 x 0.07mm
Frequency (GHz)
Main Characteristics
Tamb. = 25° Vd = 3.5V
C,
Symbol
Fop
G
Gc
OIP3
Parameter
Operating frequency range
Small signal gain
Gain control range
3
rd
Output Intercept Point @ max. gain
Min
31
17
26
25
Typ
Max
40
Unit
GHz
dB
dB
dBm
ESD Protection: Electrostatic discharge sensitive device. Observe handling precautions!
Ref. : DSCHA3694-8155 - 03 Jun 08
1/12
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
CHA3694
Electrical Characteristics
31-40GHz Variable Gain Amplifier
Tamb. = 25° These values are representative of on -wafer measurements.
C.
Symbol
Fop
G
Parameter
Operating frequency range
Nominal gain @ max. gain (31-34GHz)
Nominal gain @ max. gain (37-40GHz)
NF
Noise Figure @ nominal gain (31-34GHz)
Noise Figure @ nominal gain (37-40GHz)
RLin
Input Return Loss (any attenuation) (31-34GHz)
Input Return Loss (any attenuation) (37-40GHz)
RLout
Output Return Loss (any attenuation) (31-34GHz)
Output Return Loss (any attenuation) (37-40GHz)
OIP3
P1dB
3
rd
Output Intercept Point @ max. gain
Output Power at 1dB gain compression
@ nominal gain
Gain control range
Drain bias voltage
Drain bias current (*)
Drain current at 1dB gain compression
Gate bias voltage
Variable gain control voltage
-1.5
Min
31
14.5
17
10
8
-4
-3
-11.5
-7
25
17
26
3.5
160
180
-0.8
+0,6
Typ
Max
40
Unit
GHz
dB
dB
dB
dB
dB
dB
dB
dB
dBm
dBm
dB
V
mA
mA
V
V
Gc
Vd
Id
Idc
Vg
Vctrl
(*) Id not affected by Vctrl.
Ref. : DSCHA3694-8155 - 03 Jun 08
2/12
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
31-40GHz Variable Gain Amplifier
Absolute Maximum Ratings
(*)
Tamb = +25°
C
Symbol
Vd
Id
Vg
Vctrl
Pin
Tch
Ta
Tstg
Drain bias voltage
Power supply quiescent current
Gate bias voltage
Variable gain control voltage
RF input power overdrive @ 3.5V
Maximum channel temperature
Operating temperature range
Storage temperature range
Parameter
CHA3694
Values
4
200
-2.0 to +0.4
-2.0 to +1.0
5
+175
-40 to +85
-55 to +125
Unit
V
mA
V
V
dBm
°
C
°
C
°
C
(*)
Operation of this device above anyone of these parameters may cause permanent damage.
Ref. : DSCHA3694-8155 - 03 Jun 08
3/12
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
CHA3694
31-40GHz Variable Gain Amplifier
Typical On-Wafer Measured Performance
Tamb. = +25° Vd = +3.5V, Vg tuned for Id = 160mA
C,
Linear Gain versus Frequency
22
18
14
Linear Gain (dB)
10
6
2
-2
-6
-10
-14
-18
30
31
32
33
34
35
36
37
38
39
40
41
42
Frequency (GHz)
Vctrl=-1.5V
Vctrl=-0.8V
Vctrl=-0.7V
Vctrl=-0.6V
Vctrl=-0.5V
Vctrl=-0.4V
Vctrl=-0.3V
Vctrl=0V
Vctrl=+0.6V
Linear Gain versus Gain Control Voltage
22
18
14
Linear Gain (dB)
10
6
2
-2
-6
-10
-14
-18
-1,6
Freq=40GHz
Freq=31GHz
-1,4
-1,2
-1,0
-0,8
-0,6
-0,4
-0,2
0,0
0,2
0,4
0,6
Gain Control Voltage (V)
Ref. : DSCHA3694-8155 - 03 Jun 08
4/12
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
31-40GHz Variable Gain Amplifier
CHA3694
Gain Control Range versus Frequency
40
36
32
Gain Control Range (dB)
28
24
20
16
12
8
4
0
30
31
32
33
34
35
36
37
38
39
40
41
42
Frequency (GHz)
Return Losses versus Frequency and Gain Control Voltage (-1,5V & +0,6V)
0
-2
-4
Return Losses (dB)
-6
S11
-8
-10
-12
-14
S22
-16
-18
-20
-22
30
31
32
33
34
35
36
37
38
39
40
41
42
Frequency (GHz)
Ref. : DSCHA3694-8155 - 03 Jun 08
5/12
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
