Preliminary
PHEMT GaAs IC High Linearity Positive
Control SPDT Switch DC–2 GHz
AS178-73
Features
I
High Linearity (50 dBm IP3 @ 0.9 GHz)
@3V
I
Low Insertion Loss (0.35 dB @ 0.9 GHz)
I
Isolation (21 dB @ 0.9 GHz)
I
+3 V Operation
I
Ultra Miniature SOT-6 Package
I
PHEMT Process
SOT-6
0.074
(1.90 mm REF.)
PIN 6
PIN 1
INDICATOR
PIN 1
0.020 (0.51 mm)
0.014 (0.350 mm)
0.057 (1.45 mm)
0.035 (0.90 mm)
0.126 (3.20 mm)
0.087 (2.20 mm)
0.071 (1.80 mm)
0.052 (1.30 mm)
0.037 (0.95 mm) REF.
0.012
(0.30 mm)
TYP.
0.014
(0.26 mm)
0.004
(0.10 mm)
5.0˚ ± 1˚
0.006
(0.15 mm)
0.000
(0.00 mm)
5.0˚ ± 1˚
Description
The AS178-73 is a PHEMT GaAs FET IC high linearity
SPDT switch in a SOT-6 plastic package. This switch has
been designed for use where extremely high linearity, low
insertion loss and ultra miniature package size are
required. It can be controlled with positive, negative or a
combination of both voltages. Some standard
implementations include antenna changeover, T/R and
0.122 (3.10 mm)
0.106 (2.70 mm)
0.022 (0.61 mm)
0.004 (0.10 mm)
diversity switching over 2 W. The AS178-73 switch can be
used in many analog and digital wireless communication
systems including cellular, GSM and DECT applications.
Electrical Specifications at 25°C (0, +3 V)
Parameter
1
Insertion
Loss
3
Frequency
2
DC–0.5 GHz
DC–1.0 GHz
DC–2.0 GHz
DC–0.5 GHz
DC–1.0 GHz
DC–2.0 GHz
DC–1.0 GHz
DC–2.0 GHz
25
20
14
Min.
Typ.
0.45
0.45
0.55
28
23
17
1.2:1
1.3:1
1.4:1
1.8:1
Max.
0.6
0.6
0.7
Unit
dB
dB
dB
dB
dB
dB
Isolation
VSWR
4
Operating Characteristics at 25°C (0, +3 V)
Parameter
Switching Characteristics
5
Condition
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
0/+3 V
0/+5 V
For Two-tone Input Power +17 dBm
0/+3 V
0/+5 V
0.9 GHz
0.9 GHz
0.9 GHz
0.9 GHz
Frequency
Min.
Typ.
60
100
50
+34
+38
+50
+57
Max.
Unit
ns
ns
mV
dBm
dBm
dBm
dBm
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
V
Low
= 0 to 0.2 V @ 20 µA Max.
V
High
= +3 V @ 100 µA Max. to +5 V @ 200 µA Max.
V
S
= V
High
± 0.2 V
4. Insertion loss state.
5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
1. All measurements made in a 50
Ω
system, unless otherwise specified.
2. DC = 300 kHz.
3. Insertion loss changes by 0.003 dB/°C.
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 11/99A
1
PHEMT GaAs IC High Linearity Positive Control SPDT Switch DC–2 GHz
AS178-73
Typical Performance Data (0, +3 V)
0.8
0.7
45
40
Insertion Loss (dB)
0.5
0.4
0.3
0.2
0.1
0.0
0.0
0.5
1.0
1.5
2.0
2.5
Isolation (dB)
0.6
35
30
25
20
15
10
0.0
0.5
1.0
1.5
2.0
2.5
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.0
0.5
1.0
1.5
2.0
2.5
Isolation vs. Frequency
Absolute Maximum Ratings
Characteristic
RF Input Power
Control Voltage
Operating Temperature
Storage Temperature
Θ
JC
Value
10 W Max. > 900 MHz
0/+7 V Control
-0.2 V, +8 V
-40°C to +85°C
-65°C to +150°C
25°C/W
VSWR
Pin Out
V
S
J
2
C
BL
V
1
Frequency (GHz)
VSWR vs. Frequency
1
2
GND
6
5
10 kΩ
J
1
Truth Table
V
1
0
V
High
V
2
V
High
0
J
1
–J
2
Isolation
Insertion Loss
J
1
–J
3
Insertion Loss
Isolation
J
3
C
BL
C
BL
V
High
= +3 to +5 V (V
S
= V
High
± 0.2 V).
DC blocking capacitors (C
BL
) must be supplied externally.
C
BL
= 100 pF for operating frequency >500 MHz.
2
Alpha Industries, Inc.
[781] 935-5150
•
Fax
[617] 824-4579
•
Email
sales@alphaind.com
•
www.alphaind.com
Specifications subject to change without notice. 11/99A
3
4
V
2
Power technology
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