ALPHA AV850M1-00

18–50 GHz GaAs MMIC
Voltage Variable Attenuator
AV850M1-00
Features
Chip Outline
0.365
■ Single Voltage Control
■ 40 dB Attenuation Range
1.400
■ Balanced 0.25 µm MESFET
Non-Reflective Design
1.305
1.080
■ 100% On-Wafer RF and DC Testing
■ 100% Visual Inspection to MIL-STD-883
MT 2010
0.320
0.095
Description
2.000
1.634
Alpha’s AV850M1-00 MMIC voltage variable attenuator is
a balanced configuration incorporating Lange couplers at
input and output. The attenuator has a typical insertion loss
of 2.5 dB over the 18–40 GHz band with a worst-case
insertion loss of 3.5 dB across the full 18–50 GHz band.
The attenuation range is 35 dB over the full 18–50 GHz
band while typical I/P and O/P return loss is better than
13 dB for all attenuation states. The chip uses Alpha’s
proven 0.25 µm MESFET technology and is based upon
MBE layers and electron beam lithography for the highest
uniformity and repeatability. The MMICs employ surface
passivation to ensure a rugged, reliable part with
through-substrate via holes and gold-based backside
metallization to facilitate a conductive epoxy die attach
process. All chips are screened for insertion loss, full
attenuation and I/P and O/P match over the 18–50 GHz
band for guaranteed performance.
0.000
0.000
Dimensions indicated in mm.
All DC (V) pads are 0.1 x 0.1 mm and RF In, Out pads are 0.07 mm wide.
Chip thickness = 0.1 mm.
Absolute Maximum Ratings
Characteristic
Value
Operating Temperature (TC)
-55°C to +90°C
Storage Temperature (TST)
-65°C to +150°C
Control Voltage (VC)
-7 VDC
Power In (PIN)
30 dBm
Junction Temperature (TJ)
175°C
Electrical Specifications at 25°C (Frequency = 18, 24, 31, 38, 43, 50 GHz)
Condition
Symbol
Min.
Typ.2
Maximum Attenuation
VC = 0 V
ISO
35
45
Minimum Attenuation
VC = -5 V
IL
2.5
3.5
dB
dB
Parameter
Max.
dB
Input Return Loss
At Min. and Max. Attenuation
RLI
-20
-12.5
Output Return Loss
At Min. and Max. Attenuation
RLO
-20
-12.5
P1 dB
0
Input Power at 1 dB Gain Compression
(For All Attenuation Levels)1
Unit
dB
dBm
1. Not measured on a 100% basis.
2. Typical represents the median parameter value across the specified
frequency range for the median chip.
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com
Specifications subject to change without notice. 2/00A
1
18–50 GHz GaAs MMIC Voltage Variable Attenuator
AV850M1-00
Typical Performance Data
0
0
Min.
Insertion Loss (dB)
-20
-30
-40
-50
Max.
-60
-70
-5
-2
-10
-3
-15
S22
-4
-20
-5
-25
S11
-6
-30
-7
-35
-8
-40
-9
0
5
10
15
20
25
30
35
-45
18
40
Return Loss (dB)
Attenuation (dB)
-10
0
S21
-1
23
28
Frequency (GHz)
33
38
43
48
50
Frequency (GHz)
Attenuation vs. Frequency (By State)
Insertion Loss vs. Frequency
PIN at 1.0 dB Compression (dBm)
F = 30 GHz
0
Attenuation (dB)
-10
-20
-30
-40
-50
-60
-70
0
0.5
1.0
1.5
2.0
2.5
20
15
10
5
0
-5
0
5
10
15
20
25
30
Voltage (V)
Attenuation (dB)
Attenuation vs. Control Voltage
Attenuation vs. 1.0 dB Compression Point
Bias Arrangement
Circuit Schematic
VC
VC
RF IN
RF
RF OUT
RF
VC
VC
Bias must be applied to both VC. Voltage range is VLow = 0 V to VHigh = -5 V.
VLow corresponds to high attenuation state.
2
Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [email protected] • www.alphaind.com
Specifications subject to change without notice. 2/00A