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L Series L7222C Coaxial Transfer Switches

Technical Overviews

High performance transfer switches for microwave and RF instrumentation and systems

  • 0.03 dB insertion loss repeatability for 2 million cycles ensures accuracy and reduces calibration cycles
  • Operating life of 5 million cycles typical
  • Unmatched isolation maximizes measurement accuracy and improves system dynamic range
  • Economical price minimizes budgetary constraints

Flexibility is essential in signal routing applications, and the Keysight Technologies, Inc. L7222C 4-port coaxial transfer switches offer just that. They provide exceptional repeatability, low insertion loss, and high isolation. These switches provide simplification of design in signal routing and conditioning applications.

The L7222C can be used in a variety of applications, such as switching two inputs and two outputs, signal reversal switching or as a drop-out switch. Innovative design and careful process control mean the L7222C meet the requirements for highly repeatable switching elements in test instruments and switching interfaces. They offer exceptional insertion loss repeatability, reducing sources of random errors in the measurement path and improving 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.

Keysight L7222C transfer switches provide simplification of design in signal routing and conditioning applications with

  • 0.03 dB insertion loss repeatability for 2 million cycles
  • Excellent isolation, typically > 80 dB at 26.5 GHz
  • Opto-electronic indicators and interrupts
  • Magnetic latching
  • TTL/5V CMOS compatible

Description

Operating from DC to 26.5 GHz, these switches exhibit exceptional isolation performance required to maintain measurement integrity. Isolation between ports is typically > 90 dB to 12 GHz, > 80 dB to 26.5 GHz, reducing the influence of signals from other channels and system measurement uncertainties. Hence, the L7222C are ideal elements in large, multitiered switching systems.

The Keysight L7222C is designed to fall within most popular industry footprints. The 1¼ inch square flange provides tapped mounting holes, while the rest of the 2¾ inch long by 1¼ inch square body will easily fit into most systems. The standard 10-pin ribbon drive cable or optional solder terminal connections accommodate the need for secure and efficient control cable attachment.

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. The L7222C have circuits that interrupt the current to all the solenoids once switching is complete and offer independent indicators that are controlled by optical interrupts. These indicators provide a closed path between the indicator common pin and the corresponding sense pin of the selected path.

Applications

The Keysight L7222C transfer switches can be used in many different applications to increase system flexibility and simplify system design. The following are five examples: switch between two inputs and two outputs, use as a drop-out switch, use for signal reversal, configure as a SPDT switch, and bypass an active device.

The L7222C transfer switches have the ability to exchange two signals between two inputs and two outputs. The transfer switch can connect two different instruments with two devices under test (DUT). Once switched, the signals are exchanged between the two instruments and the two DUTs. The exchanged signals allow complete network and spectrum analysis on two devices with a single switch and one test setup. See Figure 2 for an example of this application.

The L7222C can be used as a simple drop-out switch where a signal is either run through the device under test or straight through the switch, bypassing the device. See Figure 3.

In the signal reverse configuration, a device can be connected across two diagonal ports of the L7222C transfer switch. This will allow the signal direction through the device to be reversed. See Figure 4.

By attaching an external termination, the designer can use the L7222C in a SPDT terminated switch configuration.

In Figure 6, an active device, such as an amplifier, is inserted into a signal path presenting a unique problem. A single transfer switch has the undesirable characteristic of shunting the output of the amplifier to its input when the signal is bypassing the amplifier. The advantage of using two transfer switches is that an additional signal path is available; however two SPDT switches can also be used. This additional path can utilize the same amplifier when the original path is bypassed.

Electronic position indicators

The independent electronic position indicators consist of optically isolated, solid-state relays, which are driven by photo-electric sensors coupled to the mechanical position of the RF path’s moving elements. See Figure 10. The circuitry consists of a common which can be connected to an output corresponding to either position A or position B. The solid state relays are configured for AC and/or DC operation. (See indicator specifications.) The electronic position indicators require that the supply (+20 VDC to +32 VDC) be connected to pin 1 but requires that pin 9 be grounded if pulse drive is used and continuous indicators operation is desired. If pin 9 is not grounded, the position indicators will function while the appropriate drive has ground applied.

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