The PXIe-5654 /5654 with PXIe-5696 allows you to do pulse modulation, and you apply the modulating signal at the PXIe-5654 PULSE IN connector.

The modulating signal levels should be consistent with transistor-transistor logic (TTL) levels. The damage levels of the PXIe-5654 PULSE IN connector are ≤-0.5 V and ≥5.5 V. The modulating frequency should be ≤10 MHz. At high modulation frequencies, pulse width compression occurs. To achieve 50% duty cycle, you may need to increase the duty cycle of the modulating signal.

Using NI-RFSG , you can select the pulse modulation mode to apply to achieve the desired pulse modulation profile.

Pulse Modulation Modes

You can apply pulse modulation in either the optimal match mode or high isolation mode. High isolation mode allows for the best on/off power ratio of the pulsed signal. Optimal match mode provides for a more optimal power output match for the PXIe-5654 /5654 with PXIe-5696 during the off cycle of the pulse mode operation.