Features
The Agilent 87104B multiport switch improves insertion loss repeatability and isolation, which is necessary for higher performance test systems. The repeatability and reliability of this switch is vital to ATS measurement accuracy and can cut the cost of ownership by reducing calibration cycles and increasing test system up time. The Agilent 87104B terminated multiport switch provides the long life and reliability required for automated test and measurement, signal monitoring, and routing applications. Highly repeatable switching capability is made possible through Agilent's rigorous design and tight manufacturing specifications. Low insertion loss repeatability reduces sources of random errors in the measurement path, which improves measurement accuracy.
Type
- SP4T configuration
- Magnetic latching
- Terminated ports
Excellent RF repeatability & long life span
- Operating life of 10 million cycles
- Guaranteed repeatability of 0.03 dB up to 5 million cycles
Superior RF Performance
- Excellent isolation, typically >90 dB at 26.5 GHz
Features
- Opto-electronic indicators and interrupts
- TTL/5V CMOS compatible (optional)
| Options |
Price US$ |
| 87104B-024 |
24 VDC |
0 |
| 87104B-100 |
Solder terminals |
call |
| 87104B-161 |
16-pin DIP socket and connector with 24 inch ribbon cable |
0 |
| 87104B-T24 |
24 VDC bias with TTL logic |
call |
| 87104B-UK6 |
Commercial cal. certificate w/ test data |
call |
| Repair Options |
Price US$ |
| R-51B-001-C |
1 year Return-to-Agilent warranty |
0 |
Modern automated test systems demand higher accuracy and performance than ever before. The Agilent Technologies 87104A/B/C and 87106A/B/C multiport switches offer improvements in insertion loss repeatability and isolation necessary to achieve higher test system performance. Long life, repeatability, and reliability lowers the cost of ownership by reducing calibration cycles and increasing test system uptime and are vital to ATS measurement system integrity over time.
Description
The 87104A/B/C SP4T and 87106A/B/C SP6T terminated multiport switches provide the life and reliability required for automated test and measurement, signal monitoring, and routing applications.
Innovative design and careful process control creates switches that meet the requirements for highly repeatable switching elements in test instruments and switching interfaces.
The switches are designed to operate for more than 10,000,000 cycles. The exceptional 0.03-dB insertion loss repeatability is warranted for 5 million cycles at 25°C. This reduces sources of random errors in the measurement path and improves measurement uncertainty. Switch life is a critical consideration in production test systems, satellite and antenna monitoring systems, and test instrumentation.
The longevity of these switches increases system uptime, and lowers the cost of ownership by reducing calibration cycles and switch maintenance. Operating to 4 GHz (A models), 20 GHz (B models), and 26.5 (C models), these switches exhibit exceptional isolation performance required to maintain measurement integrity. Isolation between ports is typically >100 dB to 12 GHz and >90 dB to 26.5 GHz. This reduces the influence of signals from other channels, sustains the integrity of the measured signal, and reduces system measurement uncertainties.
These switches also minimize measurement uncertainty with low insertion loss and reflection, which make them ideal elements in large multitiered switching systems.
Both the 87204A/B/C and 87206A/B/C are designed to fall within most popular industry footprints. The 2 1/4 inch square flange provides mounting holes, while the rest of the 2 1/2 inch long by 2 1/4 inch diameter body will easily fit into most systems. Ribbon cable or optional solder terminal connections accommodate the need for secure and efficient control cable attachment.
Option 100 provides solder terminal connections in place of the 16-pin ribbon drive cable. Option 100 does not incorporate the “open all paths” feature.
Opto-electronic interrupts and indicators improve reliability and extend the life of the switch by eliminating DC circuit contact failures characteristic of conventional electromechanical switches. These switches have an interrupt circuit that provides logic to open all but the selected ports, and then closes the selected paths. All other paths are terminated with 50 ohm loads, and the current to all the solenoids is then cut off. These versions also offer independent indicators that are controlled by optical interrupts in the switch. The indicators provide a closed path between the indicator common pin and the corresponding sense pin of the selected path.
Applications
Multiport switches find use in a large number of applications, increasing system flexibility and simplifying system design.
Simple signal routing
The simplest signal routing scheme takes the form of single input to multiple outputs. These matrixes are often used on the front of an analyzer in order to test several two-port devices sequentially or for testing multiport devices. In surveillance applications, a multiport switch can be used for selecting the optimum antenna in order to intercept a signal.
Two methods can be used to accomplish the single input to multiple output arrangement. Traditionally where isolation greater than 60 dB was required, a tree matrix composed of SPDT switches was used. While this gave great isolation, it was at the cost of more switches (Figure 2). The 87104 and 87106 switches have portto-port isolations typically greater than 90 dB at 26.5 GHz, eliminating the need to use a tree matrix in order to achieve high isolation (Figure 3).
In addition to the reduced part count, the path lengths are shorter, so insertion loss is less, and paths are of equal length, so phase shift is constant.
Full access switching
Full access switching systems give the flexibility to route multiple input signals to multiple outputs simultaneously.
Full access switching matrixes find use in generic test systems in order to provide flexible routing of signals to and from many different devices under test and stimulus and analysis instrumentation. Cross-point matrixes, using single pole double throw and cross-point switches, have traditionally been used in order to maintain high channel-to-channel isolation (Figure 4). As with the tree matrixes, this is at the cost of hardware and performance. Full access switching can also be achieved using multiport switches (Figure 5).
The advantage of the multiport matrix over the cross-point matrix is lower insertion loss and improved SWR performance due to consistent path length and fewer switches and connecting cables.
Dedicated switching
There are a number of applications where switching will be used, not for flexibility, but to accomplish a particular function within an instrument.
For example, switched filter banks for reducing harmonics in the output of sources or to the input of analyzers can use multiport switches in series to select the right filter for the band of interest. For larger switching systems, where many switches will be used to provide complex signal routing, a switch driver such as the Agilent 87130A or 70611A with 87204/6 switches is recommended.
Driving the switch
Each RF path can be closed by applying ground (TTL “High” for Option T24) to the corresponding “drive” pin.
In general, all other RF paths are simultaneously opened by internal logic.
Standard drive
• Connect pin 1 to supply (+20 VDC to +32 VDC)
• Connect pin 15 to ground
• Select (close) desired RF path by applying ground to the corresponding “drive” pin; for example ground pin 3 to close RF path 1
• To select another RF path, ensure that all unwanted RF path “drive” pins are disconnected from ground (to prevent multiple RF path engagement). Ground the “drive” pin which corresponds to the desired RF path (see Note 3).
• To open all RF paths, ensure that all RF path “drive” pins are disconnected from ground. Then, connect pin 16 to ground. Note: This feature is not available with Option 100.
TTL drive (Option T24)
• Connect pin 1 to supply (+20 VDC to +32 VDC)
• Connect pin 15 to ground
• Select (close) desired RF path by applying TTL “High” to the corresponding “drive” pin; for example apply TTL “High” to pin 3 to close RF path 1
• To select another path, ensure that all unwanted RF path “drive” pins are at TTL “Low” (to prevent multiple RF path engagement). Apply TTL “High” to the “drive” pin which corresponds to the desired RF path
• To open all RF paths, ensure that all RF path “drive” pins are at TTL “Low.” Then, apply TTL “High” to pin 16. Note: This feature is not available with Option 100.
Notes:
1. Pin 15 must always be connected to ground to enable the electronic position-indicating circuitry and drive logic circuitry.
2. After the RF path is switched and latched, the drive current is interrupted by the electronic positionsensing circuitry. Pulsed control is not necessary, but if implemented, the pulse width must be 15 ms minimum to ensure that the switch is fully latched.
3. The default operation of the switch is break-before-make. Make-beforebreak switching can be accomplished by simultaneously selecting the old RF path “drive” pin and the new RF path “drive” pin. This will simultaneously close the old RF path and the new RF path. Once the new RF path is closed (15 ms), de-select the old RF path “drive” pin while leaving the new RF path “drive” pin selected. The switch circuitry will automatically open the old RF path while leaving the new RF path engaged.
4. In addition to the quiescent current supplying the electronic position-sensing circuitry, the drive current flows out of pin 15 (during switching) on TTL drive switches (Option T24).
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