HIGH ISOLATIONSURFACE MOUNT
PIN DIODE SWITCHES (MODULES) SERIES SWX
0.22.4GHz
FEATURES
Full Cellular Frequency Coverage: 2002400 MHz (Ideal for PCS Applications)
Thick Film Hybrid Circuitry Sealed in Rugged Ceramic "Surfpac" Packages
Silicon PIN Diode Design is More Robust and ESD Safe than GaAs
Counterparts
Full Bottom Ground Plane Allows Area Under Switch to be Used for Other
Purposes
Driverless Design Permits Use of Space Saving Common Drivers in Switch
Networks
Easily Integrated with Power Dividers, Microprocessors, Power Supplies and
Lightning Protection to Form Multi-throw Switch Matrix Subassemblies
OVERVIEW
The SWX Series incorporates a PIN diode design with a unique sealed surface
mount alumina header resulting in high isolation, miniature switch modules with
excellent isolation versus insertion loss characteristics from 2002400 MHz. The
switch modules are designed to meet the rigors of cellular and PCS base station
RF transmission systems, which are often subject to spikes from RF switching and
indirect lightning strikes. Other switches that utilize GaAs diodes are not the best
choice in these applications due to their sensitivity to electrostatic discharge (ESD)
and because of their inherently limited power handling ability. Silicon PIN diodes
are more robust and less sensitive to ESD than their GaAs MMIC counterparts.
The design utilizes thick film hybrid circuitry inside ceramic "Surfpac" packages
which were chosen over plastic types due to their lower insertion loss and high-
er isolation at the higher operating frequencies which are required for PCS ser-
vice. The switches have been integrated with power dividers, microprocessors,
power supplies and lightning protection to form multi-throw switch matrixes. They
are compatible with reflow soldering and are suitable for automatic insertion as
well. The switches are available as modules on tape and reel or integrated on
softboard in a final assembly configuration. A wide range of custom configura-
tions can be specified as well.
The switches are miniature in size (only 0.375[9,53] inches square) and have a
full ground plane that allows the circuit board area under the modules to be
used for other purposes. All switches in the series are provided without integral
drivers, which reduces the amount of space required in switching networks
through the use of common drivers.
The drivers themselves are available in surface mount packages from many IC
vendors. (Recommended driver circuits are shown on the reverse side for PCS
applications.) Driver and bias circuit values will largely determine RF switching
speed. Bias current will also determine intermodulation characteristics. It is
advised that customer furnished bias components be optimized for each band of
interest. The switch modules are driven with a single +5VDC supply with CMOS
drivers, and a DC bias of 10mA provides low forward loss and 5 VDC for
reverse isolation.
Typical performance of the SWX-05 version is shown. Isolation at 2 GHz is 51dB
and loss is 0.9dB.
Models SWX-01, 02, and 04 are identical in performance; the outputs are differ-
ent for ease in layout of multi-throw switch matrixes. Model SWX-05 is shown in
configuration #1 layout but can be manufactured in other configurations as well.
ELECTRICAL SPECIFICATIONS
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
0
0.2
0.6
1
dB
Insertion Loss vs. Frequency
FREQUENCY GHz
0.2
0.4
0.8
TYPICAL PERFORMANCE OF THE SWX-05
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
0
20
40
60
dB
Isolation vs. Frequency
FREQUENCY GHz
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
0
20
40
60
dB
Return Loss vs. Frequency
FREQUENCY GHz
Ins Loss at Isolation at Rtn Loss RF Power Handling
Model No. Type Configuration 2GHz typical 2GHz typical 2GHz typical 5V Rev. Bias 20V Rev. Bias
SWX-01 SP2T 1 0.60 dB 24.5 dB 20 dB +20 dBm +35 dBm
SWX-02 SP2T 2 0.60 dB 24.5 dB 20 dB +20 dBm +35 dBm
SWX-03 SP3T 3 0.65 dB 24.5 dB 20 dB +20 dBm +35 dBm
SWX-04 SP2T 4 0.60 dB 24.5 dB 20 dB +20 dBm +35 dBm
SWX-05 SP2T 1 0.90 dB 51.0 dB 23 dB +20 dBm +35 dBm
11-5-02
KEY: Inches[Millimeters] .XX .03 .XXX .010 [.X 0.8 .XX 0.25]
60 South Jefferson Road, Whippany, NJ 07981
Tel: 973-887-8100 Fax: 973-884-0445
email: sales@mcekdi-integrated.com
See us on the web @ www.mcekdi-integrated.com
HIGH ISOLATION SURFACE MOUNT
PIN DIODE SWITCH (MODULES) SERIES SWX
0.22.4GHz
RECOMMENDED SWITCH DRIVER CIRCUITS FOR PCS APPLICATIONS
A recommended switch driver circuit is shown below for each standard SWX type. Component types and values are
optimized for use in the PCS band 1.8 - 2.0 GHz. The switch modules operate from 0.2 - 2.4 GHz; it is advised that
customers optimize bias components for each band of interest. All components are surface mount.
.250[6,4]
SQ.
.375[9,53]
SQ.
.063[1,60]
.062[1,57]
.012[0,3]R
12 PLS.
.188
[4,78]
TYP.
.075[1,9]
TYP
.150[3,8]
TYP.
FOR MARKING CONFIGURATIONS
DASH 1,2 AND 4 SEE BELOW
.100[2,5]
.025[6,4]
,,
,,,
,,,,,
,,,,
,,
,,,,
,,
,
,,
,
,
,,
,,,
,,,
,,
,
,
,,,,,
,,,
,,
,,,,,
,,,,,,,
,,,,,,,,,
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-3
-1
-2
-4
CONFIGURATION
Z
Z
PORT 1 PORT 2
COMMON
EQUIVALENT CIRCUIT
SWX-05
COMMON
PORT 2
+5 V
PORT 1
+5 V
U1
U1
S.M.D. COMPONENTS:
INDUCTORS: 39 nH (0805 SIZE)
CAPACITORS: 47 pF NPO (0603 SIZE)
U1: 74ACT540
N/C
CONTROL
LOGIC `0'=PORT 1
LOGIC `1'=PORT 2
RESISTORS: SWX-01 470 OHMS
RESISTORS: SWX-05 330 OHMS
MODELS
SWX-01 OR
SWX-05
COMMON
+5 V
PORT 1
+5 V
U1
U1
S.M.D. COMPONENTS:
INDUCTORS: 39 nH (0805 SIZE)
CAPACITORS: 47 pF NPO (0603 SIZE)
U1: 74ACT540
CONTROL
LOGIC `0'=PORT 1
LOGIC `1'=PORT 2
RESISTORS: 470 OHMS
PORT 2
N/C
MODEL
SWX-02
COMMON
PORT 2
PORT 3
+5 V
PORT 1
+5 V
CONTROL 3
CONTROL 2
CONTROL 1
U1
U1
U1
S.M.D. COMPONENTS:
INDUCTORS: 39 nH (0805 SIZE)
CAPACITORS: 47 pF NPO (0603 SIZE)
RESISTORS: 470 OHMS
U1: 74ACT540
MODEL
SWX-03
LOGIC `0'=ISOLATION
LOGIC `1'=INS LOSS
COMMON
PORT 2
+5 V
+5 V
U1
U1
S.M.D. COMPONENTS:
INDUCTORS: 39 nH (0805 SIZE)
CAPACITORS: 47 pF NPO (0603 SIZE)
U1: 74ACT540
CONTROL
LOGIC `0'=PORT 1
LOGIC `1'=PORT 2
RESISTORS: 470 OHMS
PORT 1
MODEL
SWX-04
N/C
CONFIGURATION NO. 1 CONFIGURATION NO. 4
CONFIGURATION NO. 3
CONFIGURATION NO. 2
11-5-02
KEY: Inches[Millimeters] .XX .03 .XXX .010 [.X 0.8 .XX 0.25]
60 South Jefferson Road, Whippany, NJ 07981
Tel: 973-887-8100 Fax: 973-884-0445
email: sales@mcekdi-integrated.com
See us on the web @ www.mcekdi-integrated.com
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