CHA3512
RoHS COMPLIANT
6-18GHz Low Noise Digital Variable Amplifier
GaAs Monolithic Microwave IC
Description
The CHA3512 is composed by a Single Pole
Double Through (SPDT) switch followed by a
one step digital attenuator and a double
stage travelling wave amplifier. It is designed
for defense applications. 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.
0dB state
It is available in chip form.
Main Features
■
Performances: 6-18GHz
■
23dBm saturated output power
■
16dB gain
■
1 bit attenuator for 20dB dynamic range
■
DC power consumption: 210mA @ 4.5V
■
Chip size: 4.27 x 2.46 x 0.1mm
20dB state
Typical on wafer Measurements
Gain versus attenuation states
Main Characteristics
Tamb. = 25°
C
Symbol
Fop
G
Psat
ATT dyn
Parameter
Operating frequency range
Small signal gain @ Attenuator state 0dB
Saturated Output power @ Attenuator state 0dB
Attenuator range
Min
6
Typ
16
23
20
Max
18
Unit
GHz
dB
dBm
dB
ESD Protection: Electrostatic discharge sensitive device. Observe handling precautions !
Ref. DSCHA3512-8144 - 23 May 08
1/10
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
CHA3512
6-18GHz Digital Variable Amplifier
Electrical Characteristics on wafer
Tamb = +25°
C
Vd = Pads B, D = 4.5V, Vg = Pads A, C tuned for Id = 210mA
Symbol
Fop
G
Parameter
Operating frequency range (1)
Small signal gain @ Attenuator state 0dB (1)
6-16GHz
16-18GHz
Min
6
Typ
Max
18
Unit
GHz
16
14
10
19
-25
16
13
20
-35
22
dB
dB
dB
ATT dyn
Is
Attenuator range
Isolation @ Attenuator state 0dB & switch OFF
(1)
Output power at 1dB compression @ Attenuator
state 0dB (1)
Saturated Output power @ Attenuator state 0dB
(1)
Noise figure @ Attenuator state 0dB
Input Return Loss all attenuator states (switch
ON)
Output Return Loss all attenuator states (switch
ON and switch OFF)
Drain bias DC voltage (
Pads B, D)
Bias current @ small signal
Control voltage for Attenuator bit & SPDT switch
P1dB
20
dBm
Psat
23
dBm
NF
RL_IN
7
-15
-8
dB
dB
RL_OUT
-20
-6
dB
Vd
Id
Vc
4.5
210
-5
250
0
V
mA
V
(1) These values are representative for on-wafer measurements that are made without bonding
wires at the RF ports.
Ref. DSCHA3512-8144 - 23 May 08
2/10
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
6-18GHz Digital Variable Amplifier
CHA3512
Absolute Maximum Ratings
Tamb. = 25° (1)
C
Symbol
Vd
Id
Vg
Vc
Pin
Tch
Ta
Tstg
Parameter
Maximum Drain bias voltage ( Pads B, D)
Drain bias current with Vd=4.5V
Gate bias voltage (Pads A,C)
Attenuator bit & SPDT control voltage
Maximum input power overdrive (2)
Maximum channel temperature
Operating temperature range
Storage temperature range
Values
+5
300
-2 to +0.4
-7 to +0.6
+20.0
+175
-40 to +70
-55 to +125
Unit
V
mA
V
V
dBm
°
C
°
C
°
C
(1) Operation of this device above anyone of these parameters may cause permanent damage.
(2) Duration < 1s.
Thermal Resistance channel to ground paddle =123°
C/W for Tamb. = +70°
C.
LNA Control interface
The attenuator state is controlled by 2 voltages. The SPDT switch is controlled by 2 voltages.
state
Theoretical
attenuation
(dB)
Voltage CONTROL
PAD
20A
(V)
20B
(V)
E
(V)
Switch control
F
(V)
0
1
2
0 référence
20
Isolation
-5
0
-5
0
-5
0
-5
-5
0
0
0
-5
Ref. : DSCHA3512-8144 - 23 May 08
3/10
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
CHA3512
6-18GHz Digital Variable Amplifier
Typical on wafer Measurements @ 25°
C
Bias conditions: Vd = 4.5V, Vg tuned for Id = 210mA
0dB state
20dB state
Linear Gain versus attenuator states
Linear Gain with SPDT switch OFF
Ref. DSCHA3512-8144 - 23 May 08
4/10
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
6-18GHz Digital Variable Amplifier
CHA3512
Saturated output power@nominal state
Attenuator accuracy versus frequency
Switch OFF
dB(S11) versus frequency for all states
dB(S22) versus frequency for all states
Ref. : DSCHA3512-8144 - 23 May 08
5/10
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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