Agilent Technologies E1470A user manual Using This Chapter, Switching Diagram

Chapter 1

Configuring the RF Switch

Using This Chapter

This chapter gives guidelines to use the Cascade RF Switch module (RF Switch) including:

• Switching Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

• Creating Multiple Multiplexers. . . . . . . . . . . . . . . . . . . . . . . . . .12

• RF Switch Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Switching Diagram

The E1470A Cascade RF Switch module consists of a series of twenty 3-to-1 multiplexers. Each 3-to-1 multiplexer can be programatically cascaded with other 3-to-1 multiplexers to form larger multiplexers. For example, combining two adjacent multiplexers (cascading) forms a 6-to-1 multiplexer, cascading three forms a 9-to-1 multiplexer, or cascading four forms a 12-to-1 multiplexer, etc. Cascading all twenty 3-to-1 multiplexers forms one 60-to-1 multiplexer.

Multiple combinations are simultaneously allowed on the module.

User connections to the module are to SMB connectors on the faceplate. Figure 1-2 shows the switching diagram of the Cascade RF Switch module with the switches shown in the power-on/reset state.

Since the relays on the switch are Form C, the relays are considered to be reset (or opened) when the COMMON terminal is connected to the NC terminal (the power-on/reset state). Relays are considered to be set (or closed) when the COMMON terminal is connected to the NO terminal. See Figure 1-1.

NO

COMMON COMMON

NC

NO

NC

Form C Relay	Form C Relay
Power-On/Reset	Set or Closed
or Open State	State

Figure 1-1. Form C Relays States

Chapter 1 Configuring the RF Switch 9