Agilent Technologies L4400 manual Simplified Connection Diagrams

7Microwave Switch/Attenuator Driver

Simplified Connection Diagrams

Single Drive With Separate Position Indicators

The simplified schematic below illustrates the connection for a single drive switch with separate position indicators. The position indicators for this type of switch are independent relay contacts that are mechanically linked to the RF switch position.

Even though this is a single drive switch, each switch state has its own coil. The switch uses internal logic to open all paths except the one being closed.

The RF paths are not shown in the simplified diagram. The coils are driven in open collector mode. The position indicator is set so that a high level indicates an active switch. The logic level of the position indicator can be inverted using the ROUTe:CHANnel:VERify:POLarity command.

The schematic shown is similar to the Agilent 87104A/B/C, 87106A/B/C, and 87406B switches. Many other switches use this technique (both with and without the position indicator).

34945EXT	Y1155A		Switch
	Distribution
	Board
	6	5	4	3	2	1
Logic Gate
Sense	IND 1
Pull Down	To IND 2 through 6
	+VI
Resistor
	+VR
	Open	6	5	4	3	2	1
	All
Open Collector
Output Driver	DRV 1
	To DRV 7		To DRV 2 through 6
184						L4400 User’s Guide