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U2121A-101 Operating Guide 19
Supported Switches
The U2121A- 101A supports three types of Agilent RF switches as
shown in Table 9. User can choose to drive the same switches in all
five channels or a mixture of three switches for five channels.
However, only one type of switch can be used in a channel at a time.
Do not use multiple types of switches in the same channel.
Drive modes
The RF switch driver board drives the switches using the open
collector drive method. It provides a current path to the ground when
asserted.
Continuous Drive
Continuous drive method controls the switches by activating the
control bit and holds it until it is disabled. This mode will have a
consistent current draw when the switch is activated.
Drive activated
H
L
DO
Channel
Output
enable
Drive ChA
Drive ChB
Drive active
Drive active
U2931A Operating Guide.book Page 19 Tuesday, June 10, 2008 10:17 AM