The PXIe-3621 and PXIe-3622 contain an I/Q modulator and I/Q demodulator with wide instantaneous bandwidth to upconvert and downconvert signals from the PXIe-5820 baseband transceiver through differential I and Q ports. The switched IF ports, IF0 and IF1, cover a tuning range of 5 GHz to 12 GHz for the PXIe-3621 and 5GHz to 21GHz for the PXIe-3622.
The PXIe-3621, part of PXIe-5830, is a full-duplex transceiver with IF0 and IF1 ports. The signal direction on each port, IF0 and IF1, can be reversed to facilitate testing of DUTs with two bi-directional ports. The modules also contains two internal synthesizers, LO2 0 and LO2 1 (for IF0 and IF1 paths respectively), that can be tuned independently thus allowing transmitting and receiving at different tune frequencies. Additionally, a single synthesizer, LO2 0 or LO2 1, can be shared between the I/Q modulator and I/Q demodulator to achieve phase noise cancellation when the transmit and receive tune frequencies are the same, alternatively an external LO can be used on LO2 IN port.
The PXIe-3622, part of PXIe-5831, provides the transmit and receive IF signals and LO signals, which are in the X and Ku frequency bands, and are chosen to avoid low-order images and intermodulation products at millimeter wave frequencies. This module contains six IF ports and two LO1 ports (see below picture), from which, two IF transmit ports, two IF receive ports, and two LO1 ports provide connectivity for two mmRH-5582 frequency converters. The remaining two IF ports on the PXIe-3622 are half-duplex ports with a tuning range of 5 GHz to 21 GHz and are used similarly like the IF ports of the 3621 without additional frequency translation. Since the PXIe-3622 is a full-duplex transceiver, one half-duplex port can be used in transmit and the other in receive simultaneously, and the signal direction can be reversed for each port.
Similarly like the 3621, The PXIe-3622 contains an I/Q modulator and I/Q demodulator with wide instantaneous bandwidth to upconvert and downconvert signals from the PXIe-5820 baseband transceiver through differential I and Q ports. Additionally, there are four synthesizers inside the PXIe-3622. Two synthesizers, connectors LO1 0 mmWave and LO1 1 mmWave, can be associated with the two mmRH-5582 modules. Two synthesizers, connectors LO2 IN and LO2 OUT, are associated with the I/Q modulator and I/Q demodulator.A single synthesizer, LO1 0 mmWave or LO1 1 mmWave, can be shared between both mmRH-5582 modules to achieve phase noise cancellation when both mmRH-5582 modules are tuned to the same frequency. Similarly, a single synthesizer, LO2 IN and LO2 OUT, can be shared between the I/Q modulator and demodulator when the IF transmit and receive tune frequencies are the same. The picture below shows the PXIe-5831 independent vs. shared LO configuration for the I/Q modulator/Demodulator in IF only mode, where LO2 A (or LO2 0)is used to drive the configured Tx path in this case, and LO2 B (LO2 1) for the Rx path. Note that the direction of both paths can be reversed. The shared LO can be equally imported through the LO2 IN port.
So if you are using the PXIe-5831 in IF mode only, you will be connecting only to IF 0 and IF 1 ports and using LO2 0 and LO2 1 for the LO sharing, LO1 ports in this case will not be used.Finally, for improved phase noise performance, a single PXIe-5653 can be used for LO1 in mmWave mode, and LO2 in IF mode.
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