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PXI RF Signal Conditioning

Figure 1. PXI-5690 Block Diagram

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.

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.

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.

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

when cascaded.

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.

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.

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.

Main Path

CH 1 OUT

Direct Path

CH 1 IN

CH 0 OUT

CH 0 IN

Step

Attenuator

Main Path

CH 1 OUT

Direct Path

CH 1 IN

CH 0 OUT

CH 0 IN

Step

Attenuator

Main Path

CH 1 OUT

Direct Path

CH 1 IN

CH 0 OUT

CH 0 IN

Fixed

Attenuator

Step

Attenuator