Microwave Switch/Attenuator Driver
8
34980A User’s Guide
215
Using Single Drive Switches and Attenuators
Some microwave
switches require a single drive. With single drive devices
the channel numbering is not consecutive across all channels in a bank
(refer to the channel numbering description on
page 212
).
The 34945A can provide single drive devices with either pulsed or
continuous drive current. Settings and parameters for continuous drive
mode are given in the next section.
Continuous Drive Current
Driving non- latching devices requires a power supply capable of handling
sustained high current requirements. You may only use continuous drive
current with channel configured for single drive. Additionally, to prevent
power supply loading, care must be taken when operating more than one
continuous drive at a time. The actual drive may be configured as either
TTL or open- collector operation.
Using Continuous Drive
The diagram below illustrates the continuous drive signals for two
channels (switches) and the relationship of the drive parameters to the
power supply requirements.
As shown in the diagram, the drive signal is initially applied to channel 1.
Drive is applied to channel 2 only after a power supply recovery period
has elapsed T(Recovery). The power supply recovery time is set using the
the
ROUTe:CHANnel:DRIVe:TIMe:RECovery
command. This parameter may
be set individually for each channel or will default to 0.0 ms following
either a
SYSTem:RMODule:RESet
or
ROUTe:RMODule:BANK:PRESet
command.
If you are verifying the channel closure (see
page 218
), you may also
specify a T(Settle) parameter. This parameter ensures the switch has had
time to change state before the position indicator is evaluated. This
parameter may be set individually for each channel or will default to
0.0 ms following either a
SYSTem:RMODule:PRESet
or
ROUTe:RMODule:BANK:PRESet
command.
T(Setttle)
T(Recovery)
Drive Ch 1
Drive Ch2
Start Drive
Channel 1
Start Drive
Channel 2
Channel 1 Position
Indicators Evaluated
Содержание Agilent 34980A
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Страница 210: ...198 34980A User s Guide 6 General Purpose Switch Modules ...
Страница 216: ...204 34980A User s Guide 7 RF Multiplexer Switch Modules ...
Страница 314: ...302 34980A User s Guide 11 4 Channel Isolated D A Converter with Waveform Memory Module ...
Страница 322: ...310 34980A User s Guide 12 Multifunction Module with DIO D A and Totalizer ...
Страница 326: ...314 34980A User s Guide 13 Breadboard Module 34959A Breadboard Module Layout shown with cover removed ...
Страница 335: ...Breadboard Module 13 34980A User s Guide 323 Dimensions of Suggested maximum size Custom PC Board ...
Страница 336: ...324 34980A User s Guide 13 Breadboard Module PC Board Footprint of Suggested DB50 Connectors M F ...