artisan pickering 20-740 Series User manual

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20-740/745
RF MULTIPLEXER MODULE
pickering
USER MANUAL
Issue 2.10 Feb. 2008
© Copyright (2008) Pickering Interfaces Ltd. All Rights Reserved
Designed & Manufactured by:-
Pickering Interfaces Limited.
Stephenson Road
Clacton-on-Sea
Essex
CO15 4NL
England
Tel: [phone]
[phone] (International)
Fax: [phone]
[phone] (International)
Internet: www.pickering.co.uk
E Mail: [email protected]
Model No. 20-740/745
RF Multiplexer Module
pickering
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20-740/745
RF MULTIPLEXER MODULE
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HELP!!!
If you need assistance with your Pickering Interfaces Switching
System: Switching problems, Programming or Integration within your Test
System. – Please ring Pickering Interfaces and ask for “Technical
Support”.
Alternatively you may fax, email or connect to our Internet Web Site.
A full set of operating manuals, application notes and software drivers is
available on CD ROM.
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20-740/745
RF MULTIPLEXER MODULE
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Contents
Section 1
20-740 R.F. Multiplexer Module................................................................................. 5
Section 2
20-745 R.F. Multiplexer Module................................................................................11
Section 3
Programming ........................................................................................................... 17
Section 4
Interconnecting R.F. Switching Modules.................................................................. 21
Section 5
Self Test................................................................................................................... 25
Section 6
Front Panel Layouts................................................................................................. 27
Section 7
Reconfiguring Driver Card to Your Application......................................................... 31
Section 8
Circuit Diagrams ...................................................................................................... 33
Section 9
Electrical, Environmental, Mechanical & Firmware Specifications .......................... 43
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20-740/745
RF MULTIPLEXER MODULE
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20-740/745
RF MULTIPLEXER MODULE
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Section 1
20-740R.F. Multiplexer Module
1.1 Features
• Dual 8 to 1 Multiplexer with 2000MHz Bandwidth
• Configurable as 16 to 1 Multiplexer
• Available in both 50 and 75ΩVersions
• Choice of Front Panel Mounted Connectors: BNC, SMA and Type N
• Automatic Termination of all Unselected Inputs
• Ideal Building Block for Large R.F. Switching Networks
• 75ΩVersion Suitable for Telecoms and Video Switching
1.1.1 Description
The20-740seriesarearangeofhighperformancedual8to1RFBi-DirectionalMultiplexerswithabandwidthof2000MHz,
available in 50 or 75Ωversions. All non-selected input lines are terminated into a matched load. This module may also
be configured (via DIP switches) as a 16 to 1 multiplexer but with reduced r.f. performance.
Applications include routing high frequency signals to and from oscilloscopes, analysers, signal generators and
synthesizers,video/audioswitching,switchinghighfrequencylogicandmanyothersituationsinvolvingcoaxialswitching.
All inputs are automatically terminated into matched loads (50 or 75Ω).
Larger multiplexer/matrix switching networks may be constructed by interconnecting individual modules, see section 4
for further details.
1.1.2 Operation
This module is factory configured as a dual 8 to 1 multiplexer, see fig 1.2. Performance figures are given in table 1.1.
However it may also be configured (using dip switches) as a 16 to 1 multiplexer. Please note that the R.F. performance
for this configuration is to a slightly reduced specification (please refer to table 1.3 for further details).
Self-Test is performed both at power up and at any other time either manually or under program control. In the unlikely
event of relay failure the front panel will indicate a fault. The diagnosis - including the position of the suspect relay - will
be indicated using the DIAGNOSTIC? command.
This is a double height module and must be mounted into a double height (6U) case.
1.1.3 Front Panel
The module front panels are illustrated in Section 6, they include:
Status Display, 4 LED Indicators:-
Power LED. Connected to power system supply.
Active LED. On whenever one or more switches are closed. For a list of all active switches use the VIEW?
command.
Self-Test LED. Active when self-test in progress.
Error LED. Indicates that error found during self-test.
Self-Test Button. Press to initiate a self-test. While in progress the “Self-Test” LED will be on, if a failure is detected
thenthe“Error”LEDwillbesetonpermanently. UsetheDIAGNOSTIC? command to find the exact cause of any failure,
refer to section 5 for further details. NB: Self-Test button will only respond when module is inactive.
1.1.4 20-740 Module Model Numbers
The following table lists the standard options available with the RF multiplexer module:-
Model Number Configuration Connector Impedance
20-740-501 Dual 8 to 1 MUX BNC 50Ω
20-740-511 Dual 8 to 1 MUX SMA 50Ω
20-740-521 Dual 8 to 1 MUX Type N 50Ω
20-740-701 Dual 8 to 1 MUX BNC 75Ω
Further connector types may be available (particularly 75Ω), please contact factory for further details.
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Multiplexer Model 20-740-501 20-740-511 20-740-521 20-740-701
Impedance 50Ω50Ω50Ω75Ω
Max Frequency 1500MHz 2000MHz 2000MHz 1000MHz
Max Insertion Loss < 3dB < 3dB < 3dB < 3dB
VSWR < 1.8:1 < 1.6:1 < 1.6:1 < 1.8:1
(1.0GHz) (1.5GHz) (1.5GHz) (800MHz)
Isolation (at 2GHz) > 60dB > 60dB > 60dB > 60dB
Crosstalk (at 2GHz) > 55dB > 55dB > 55dB > 55dB
Terminating Resistors Yes Yes Yes Yes
Terminating Resistor
Max Power 0.25W 0.25W 0.25W 0.25W
.c.dV03Switch VoltagexaM
W01rewoPxaM
W51rewoPyrraCxaM
A5.0tnerruChctiwSxaM
m052<ecnatsiseRnOhtaP Ω(d.c.)
01>ecnatsiseRnOhtaP 8Ω(d.c.)
Sm02emiTgnihctiwS
Table 1.1 General Specification
(Dual 8 to 1 Multiplexer Mode)
Fig 1.1 8 to 1 Multiplexer Half of Model 20-740
1
50Ω
2
3
8
50Ω
50Ω
50Ω
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20-740/745
RF MULTIPLEXER MODULE
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1.2 Dual 8 to 1 Multiplexer Mode
This is the standard configuration offering the user most flexibility, the module contains two separate 8 to 1 multiplexers,
whichmaybeoperatedindependentlyofoneanother. Theseunitsoffertheuseraveryflexiblebuildingblocktoconstruct
large R.F. switching systems, see Section 4 for further information.
1
50Ω
2
3
8
50Ω
50Ω
50Ω
Bank 1
1
50Ω
2
3
8
50Ω
50Ω
50Ω
Bank 2
Fig 1.2 Dual 8 to 1 Multiplexer Mode
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-30 dB
-50 dB
-60 dB
-70 dB
-80 dB
-90 dB
-40 dB
500MHz
1000MHz
1500MHz
20-740 CROSSTALK
(8 to 1 and 16 to 1 modes)
2000MHz
Fig 1.5 Typical Crosstalk: 50ΩDual 8 to 1 Multiplexer Mode
-80 dB
-90 dB
-70 dB
-100 dB
500MHz
1000MHz
1500MHz
20-740 ISOLATION
(8 to 1 and 16 to 1 modes)
2000MHz
-40 dB
-50 dB
-60 dB
Fig 1.4 Typical Isolation: 50ΩDual 8 to 1 Multiplexer Mode
0 dB
-0.8 dB
-1.2 dB
-1.6 dB
-2.0 dB
-2.4 dB
-2.8 dB
-0.4 dB
500MHz
1000MHz
1500MHz
20-740 INSERTION LOSS
-3.2 dB
2000MHz
BNC
SMA
Fig 1.3 Typical Insertion Loss: 50ΩDual 8 to 1 Multiplexer Mode
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RF MULTIPLEXER MODULE
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Fig 1.6 Typical VSWR: 50ΩDual 8 to 1 Multiplexer Mode
500MHz
1000MHz
1500MHz
20-740 VSWR (RETURN LOSS)
1.6
1.4
1.2
1.0
1.8
2000MHz
13dB
16dB
21dB
11dB
VSWR
Return Loss
26dB
SMA
BNC
90%
50%
10%
200pS
400pS
600pS
20-740 TYPICAL
STEP RESPONSE
380pS
Fig 1.7 Step Response: 50ΩDual 8 to 1 Multiplexer Mode
1.3 Single 16 to 1 Multiplexer Mode
This configuration provides a single 16 to 1 multiplexer, it operates in a similar manner to the 8 to 1 version. R.F.
performance is slightly reduced.
1
50Ω
2
3
50Ω
50Ω
16
50Ω
COM 1
Fig 1.8 Single 16 to 1 Multiplexer Mode
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RF MULTIPLEXER MODULE
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Fig 1.8 20-740 Multiplexer Module (SMA Version)
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RF MULTIPLEXER MODULE
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Section 2
20-745 R.F. Multiplexer Module
2.1 20-745 Multiplexer Features
• Quad 8 to 1, Dual 16 to 1 and Single 32 to 1 Multiplexer with up to 2000MHz Bandwidth
• Available in both 50 and 75ΩVersions
• Choice of Front Panel Mounted Connectors: SMB, Type 43 and MMC Connectors
• Front Panel LED Indicators
• Built-In Self Test
• Ideal Building Block for Large R.F. Switching Networks
• 75ΩVersion Suitable for Telecoms and Video Switching
2.1.1 Description
A High Density 1500MHz Multiplexer arranged as a Quad 8 to 1 or Dual 16 to 1 or Single 32 to 1 configuration, all with
excellent Insertion Loss, VSWR & Isolation, available in a choice of 50 or 75Ωversions with SMB, Type 43 or MMC
Connectors.
This module is a higher density version of type 20-740 with the automatic termination function removed, the RF
performance specification is similar. It is an equivalent to the 20-730-902 balanced 120Ωmultiplexer.
Applicationsforthe20-745includeroutinghighfrequencysignalstoandfromoscilloscopes,analysers,signalgenerators
and synthesizers, telecoms tributary switching, video/audio switching and switching high frequency logic signals.
Larger multiplexer/matrix switching networks may be constructed by interconnecting individual modules, see section 4
for further details.
2.1.2 Operation
This module is factory configured as a quad 8 to 1 multiplexer, see fig 2.4. Performance figures are given in table 2.1.
Howeveritmayalsobeconfigured(usingdipswitchesandjumpercables) asa16 to1or 32to1 multiplexer. Pleasenote
that the R.F. performance for these configurations will be to a slightly reduced specification, please refer to table 2.1 for
further details.
Self-Test is performed both at power up and at any other time either manually or under program control. In the unlikely
event of relay failure the front panel will indicate a fault. The diagnosis - including the position of the suspect relay - will
be indicated using the DIAGNOSTIC? command.
This is a double height module and must be mounted into a double height (6U) case.
2.1.3 Front Panel
The module front panels are illustrated in Section 6, they include:
Status Display, 4 LED Indicators:-
Power LED. Connected to power system supply.
Active LED. On whenever one or more switches are closed. For a list of all active switches use the VIEW?
command.
Self-Test LED. Active when self-test in progress.
Error LED. Indicates that error found during self-test.
Self-Test Button. Press to initiate a self-test. While in progress the “Self-Test” LED will be on, if a failure is detected
thenthe“Error”LEDwillbesetonpermanently. UsetheDIAGNOSTIC?commandtofindtheexactcauseofanyfailure,
refer to section 5 for further details. NB: Self-Test button will only respond when module is inactive.
Width and Dimensions. All modules conform to the 6U height (262mm) Eurocard standard and are 160mm deep,
panel width is 1.8 Inches (45.7mm).
2.1.4 20-745 Module Model Numbers
The following table lists the standard options available with the RF multiplexer module:-
Model Number Bandwidth Connector Impedance
20-745-501 1500MHz SMB Version 50Ω
20-745-521 1000MHz MMC Version 50Ω
20-745-701 1500MHz SMB Version 75Ω
20-745-711 1500MHz Type 43 Version 75Ω
20-745-721 1000MHz MMC Version 75Ω
When ordering a configuration code should be specified, the module will then be preconfigured in Quad 8, Dual 16 or Single 32
channel mode. Other connector types are available to order.
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RF MULTIPLEXER MODULE
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Fig 2.1 20-745 Multiplexer Module (MMC Version)
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RF MULTIPLEXER MODULE
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1
2
3
4
5
32
Common
1
2
3
4
5
16
Common
MUX Bank 1
1
2
3
4
5
16
Common
MUX Bank 2
1
2
3
4
5
8
Common
MUX Bank 1
1
2
3
4
5
8
Common
MUX Bank 2
1
2
3
4
5
8
Common
MUX Bank 3
1
2
3
4
5
8
Common
MUX Bank 4
Fig 2.2 20-745 Single 32 Channel
Multiplexer Configuration Fig 2.3 20-745 Dual 16 Channel
Multiplexer Configuration
Fig 2.4 20-745 Quad 8 Channel Multiplexer Configuration
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Table 2.1 Switching Specification
Specification (16 to 1 Mode)
Characteristic Impedance 50 or 75Ω
Maximum Frequency 1500MHz
Rise Time < 0.5nS
Maximum Insertion Loss < 2dB
V.S.W.R. (at 1300MHz) < 1:1.6
Isolation (at 1500MHz) > 75dB
Crosstalk (at 1500MHz) > 55dB
Maximum Voltage 100V d.c.
Maximum Power 10W
Maximum Switch Current 0.1A
On Path Resistance < 250 mΩ
Off Path Resistance > 108Ω
Differential Thermal Offset < 20µV
Expected Life (Low Power) > 2x107ops
Expected Life (Max Power) > 3x105ops
Switching Time 10mS
Additional Specification (8 to 1 Mode)
Maximum Frequency 2000MHz
Additional Specification (32 to 1 Mode)
Maximum Frequency 1000MHz
1.8"1.8"
High Density
50 Way
MMC
Coaxial
Connector
SMB or Type 43
Coaxial Connector
(36 per module)
32 Channel
Indicator
LEDs
Fig 2.5 20-745 Front Panel/Connector Options
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Fig 2.8 Typical Crosstalk: 50ΩDual 16 to 1 Multiplexer Mode
Fig 2.7 Typical VSWR: 50ΩDual 16 to 1 Multiplexer Mode
Fig 2.6 Typical Insertion Loss: 50ΩDual 16 to 1 Multiplexer Mode
0 dB
-0.8 dB
-1.2 dB
-1.6 dB
-2.0 dB
-2.4 dB
-2.8 dB
-0.4 dB
500MHz
1000MHz
1500MHz
20-745 INSERTION LOSS
-3.2 dB
2000MHz
500MHz
1000MHz
1500MHz
20-745 VSWR (RETURN LOSS)
1.6
1.4
1.2
1.0
1.8
2000MHz
13dB
16dB
21dB
11dB
VSWR
Return Loss
26dB
-30 dB
-50 dB
-60 dB
-70 dB
-80 dB
-90 dB
-40 dB
500MHz
1000MHz
1500MHz
20-745 CROSSTALK
2000MHz
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Fig 2.9 Typical Isolation: 50ΩDual 16 to 1 Multiplexer Mode
Fig 2.10 Step Response: 50ΩDual 16 to 1 Multiplexer Mode
90%
50%
10%
200pS
400pS
600pS
20-745 TYPICAL
STEP RESPONSE
400pS
-80 dB
-90 dB
-70 dB
-100 dB
500MHz
1000MHz
1500MHz
20-745 ISOLATION
2000MHz
-40 dB
-50 dB
-60 dB
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3.1 Select Module Address
Choose module address (from 0 - 30) using the address select switch (SW1) on the driver card.
SW1
7
8
9
10
1
2
3
4
5
6
Top View
7
8
9
10
1
2
3
4
5
6
Side View
PCB
ON
module address
bank address
16 8 4 2 1
16 8 4 2 1
Fig 3.1 The module address selected in the illustration is 22 (i.e. 16 + 4 + 2 = 22).
3.2 Select Module Bank (Secondary) Address
3.2.1 Single Multiplexer Mode
Whenmorethanonemoduleisusedtomakeupamultiplexer(seefig3.2below,wherefour16channelmodulesareused
tomakeupa64channelmultiplexer),thenallmultiplexerunitsmusthavethesameprimaryaddress, thelocationofeach
module within the multiplexer is given by its bank address. Bank addresses must start at 0.
If there is a problem with any of the modules used to make up a large multiplexer then an error will be detected (use the
REPORT? query to discover the cause).
If only one multiplexer model is used then bank address 0 must be used.
Bank 3Bank 2Bank 1Bank 0
Channels: 49-64
Channels: 33-48
Channels: 17-32
Channels: 1-16
Fig 3.2 Configuring the Multiplexer System
(All modules must have the same primary address)
3.2.2 Dual/Quad Multiplexer Mode
If more than one multiplexer in the dual or quad mode is to be used to build up a large high performance multiplexer (i.e.
optimised insertion loss/VSWR) then each module’s primary address should have a different value, see diagram below.
TheDual8to1modeyieldsmaximisedRFperformance,howevertheselectingofthemodule’saddressesisalittlemore
complex. If your application does not require maximised RF performance then configure all modules in single mode, as
in fig 3.2.
Address 3Address 2Address 1Address 0
bank 0 bank 1
bank 0 bank 1
bank 0 bank 1
bank 0 bank 1
Channels: 1-16
Address 4
bank 0 bank 1
Channels: 49-64
Channels: 33-48
Channels: 17-32
Fig 3.3 Configuring A Large Multiplexer System
(64 Channel using 5 x 20-740 modules)
Section 3
Programming
X 2
X 1
X 0
Y 1
Y 0
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3.3 General Programming Commands
ARESET a Open all channels/crosspoints on device a
DELAY t Force a minimum delay of t milliseconds between two instructions
RESET Open all switches on all modules
VIEW? a View status of device a
3.4 Configuration Specific Programming Commands
The multiplexer/matrix module may be configured in one of the following modes:-
3.4.1 Quad Multiplexer Mode (20-745 only)
Each module contains four 8 to 1 multiplexers, referred to as banks 1, 2, 3 and 4.
CHAN a,b,c Select channel con bank bof multiplexer a. Only one channel at a time is permitted to be on, automatic
break-before-make is always enforced. bis in the range 1 to 4.
e.g. CHAN 12,4,7 will operate the module with address 12 selecting bank 4 channel 7.
CHAN 15,2,1 will operate the module with address 15 selecting bank 2 channel 1.
3.4.2 Dual Multiplexer Mode
Each module contains two 16 or 8 to 1 multiplexers, referred to as banks 1 and 2.
CHAN a,b,c Select channel con bank bof multiplexer a. Only one channel at a time is permitted to be on, automatic
break-before-make is always enforced. bis in the range 1 to 2.
e.g. CHAN 3,1,7 will operate the module with address 3 selecting bank 1 channel 7.
CHAN 15,2,1 will operate the module with address 15 selecting bank 2 channel 1.
3.4.3 Single Multiplexer Mode
Each module contains a single 32 or 16 to 1 multiplexer.
CHAN a,b,c Select channel con bank bof multiplexer a.
3.5 Programming Examples
The following are simple examples of how to program the module in each of it’s 3 modes of operation:-
3.5.1 Single Multiplexer Mode
First, to check the size of the multiplexer at address 7.
TYPE? 7 will return “MUX(16)” (20-740 module).
To close channel 3 on multiplexer 7, bank 1.
CHAN 7,1,3 (or just CHAN 7,3)
Now to look at status of multiplexer 7.
VIEW? 7 will return “3”
To clear the multiplexer.
ARESET 7
Now to look at status.
VIEW? 7 will return “0".
3.5.2 Dual 16 to 1 Multiplexer Mode
First, to check the size of the multiplexer at address 21.
TYPE? 21 will return “MUX(2[16])” (20-745 module).
To close channel 3 (bank 1) on multiplexer 21.
CHAN 21,1,3
Now to look at status of multiplexer 21, bank 1.
VIEW? 21,1 will return “3”.
To clear bank 1.
ARESET 21,1
Or to clear both banks.
ARESET 21
Now to look at status.
VIEW? 21,1 will return “0".
VIEW? 21 will return the status of both multiplexer banks.
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3.5.3 Quad 8 to 1 Multiplexer Mode (20-745 Only)
First, to check the size of the multiplexer at address 21.
TYPE? 9 will return “MUX(4[8])”.
To close channel 7 (bank 4) on multiplexer 9.
CHAN 9,4,7
Now to look at status of multiplexer 9, bank 4.
VIEW? 9,4 will return “7”.
To clear bank 4.
ARESET 9,4
Now to look at status.
VIEW? 9,4 will return “0", the status of bank 4.
VIEW? 9 will return the status of all multiplexer banks.
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