PXI RF Signal Conditioning
CH 0 IN
CH 0 OUT
PXI-5695 RF Programmable Attenuator
The PXI-5695 is a 50 MHz to 8 GHz, two-channel RF programmable attenuator
with one fixed attenuation path and one programmable attenuation path.
The combined paths can provide up to 70 dB of total attenuation at 2.5 GHz
Step
Attenuator
Main Path
CH 1 IN
Direct Path
CH 1 OUT
when cascaded.
Fixed
Attenuator
Figure 1. PXI-5690 Block Diagram
CH 0 IN
Channel 0 functions as a fixed gain preamplifier with a typical gain of 30 dB
across all frequencies. This channel offers a low noise figure and a flat
frequency response.
Channel 1 functions as a programmable preamplifier containing two user-
selectable paths. The main path consists of a step attenuator followed by a fixed
gain amplifier. The step attenuator is software programmable in 1 dB steps. In
software, you can configure channel 1 to provide up to 10 dB of attenuation or up
to 22 dB of gain – depending on frequency range. The direct path gives you the
option of bypassing the attenuator-amplifier circuitry.
CH 1 IN
CH 0 OUT
Main Path
Direct Path
Step
Attenuator
CH 1 OUT
Figure 3. PXI-5695 Block Diagram
Channel 0 functions as a fixed attenuator with more than 27.5 dB of
attenuation across all frequencies.
Channel 1 functions as a programmable attenuator with up to 42 dB
of attenuation across all frequencies. You can control this attenuator
programmatically in software with 0.5 dB resolution.
PXI-5691 RF Programmable Amplifier
The PXI-5691 is a 50 MHz to 8 GHz, two-channel programmable amplifier with
one fixed gain path and one programmable gain path. The combined paths can
provide up to 55 dB of total signal gain at 2.5 GHz when the two channels
are cascaded.
CH 0 IN
CH 0 OUT
Software
You can programmatically control PXI-569x modules using NI-5690 programming
software. This driver provides C-style and NI LabVIEW APIs to help you control
both gain and attenuation. A block diagram of a basic LabVIEW example to
control the PXI-5691 amplifier is shown in Figure 4.
Step
Attenuator
Main Path
CH 1 IN
Direct Path
CH 1 OUT
Figure 2. PXI-5691 Block Diagram
Channel 0 functions as a fixed gain preamplifier with a typical gain of more
than 26 dB across all frequencies. This channel offers a low noise figure and a
flat frequency response.
Channel 1 functions as a programmable preamplifier containing two user-
selectable paths. The main path consists of fixed gain amplification preceded
by a step attenuator that is adjustable by software in 0.5 dB nominal steps. The
direct path gives you the option of bypassing the attenuator-amplifier circuitry.
Figure 4. You can control PXI RF signal conditioning modules with NI LabVIEW software.
Ordering Information
NI PXI-5690 ....................................................................................779465-01
NI PXI-5691 ....................................................................................781035-01
NI PXI-5695 ....................................................................................781036-01
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For complete product specifications, pricing, and accessory information,
call 800 813 3693 (U.S.) or go to
ni.com/rf.
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