Agilent Technologies E1470A Creating Multiple Multiplexers, Configuring the RF Switch Chapter

Creating Multiple Multiplexers

Channel

(BB)0

(BB)1

(BB)2

(BB)0

(BB)1

(BB)2

(BB+1)0

(BB+1)1

(BB+1)2

(BB+2)0

(BB+2)1

(BB+2)2

You can configure the Cascade RF Switch module to create multiple multiplexers of varying sizes. In its power-on/reset state, the switch is configured as 20 independent 3-to-1 multiplexers. By specifying a valid path from a COM terminal to a channel in a different bank (functionally cascading contiguous 3-to-1 multiplexers) other multiplexer sizes can be configured.

Figure 1-3 shows typical 3-to-1, 6-to-1, 9-to-1, and 12-to-1 multiplexers. Other sizes can be configured by specifying valid ROUTe:PATH statements (see Chapter 2 for details). See Figure 1-2 for channel and COM numbering information.

3-to-1
	Multiplexer
Multiplexer
	COM (BB)

(BB)0

(BB)1

(BB)2

COM (BB+1)

(BB+1)0

(BB+1)1

(BB+1)2

9-to-1	12-to-1
Multiplexer	Multiplexer

(BB)0

(BB)1

(BB)2

(BB+1)0

(BB+1)1

(BB+1)2

COM (BB+2)

(BB+2)0

(BB+2)1

(BB+2)2

COM (BB+3)

(BB+3)0

(BB+3)1

(BB+3)2

Figure 1-3. Creating Multiple Multiplexers

NOTE Generally, the COM terminal is on the highest-numbered bank. Exceptions are that channels 100 through 132 can go to COM 05 as well as to COM 13 and channels 300 through 332 can go to COM 25 as well as to COM 33.

For example, COM 01 can be used as the common for channels 000 - 002 and 010 - 012 creating a 6-to-1 multiplexer. COM 11 can be the common for channels 100 - 102 and 110 - 112 for another 6-to-1 multiplexer. COM 02 can be common for channels 000 - 002, 010 - 012, and 020 - 022 for a 9-to-1 multiplexer. COM 03 can be the common for channels 000 - 002, 010 - 012, 020 - 022, and 030 - 032 for a 12-to-1 multiplexer.

12 Configuring the RF Switch Chapter 1