Specifies the LO injection side.

Syntax

RFMXINSTR_ATTR_LO_INJECTION_SIDE

Numeric Value

Data Type

Access

Applies To

18

int32

Read/Write

N/A

Remarks

Name (value)

Description

PXIe-5663/5663E

For frequencies below 517.5 MHz or above 6.4125 GHz, the LO injection side is fixed, and the RFmx driver returns an error if you specify an incorrect value. If you do not configure this attribute, the RFmx driver selects the default LO injection side based on the downconverter center frequency. Reset this attribute to return to automatic behavior.

PXIe-5665 (3.6 GHz)

Setting this attribute to Low Side is not supported for this device.

PXIe-5665 (14 GHz)

Setting this attribute to Low Side is supported for this device for frequencies greater than 4 GHz, but this configuration is not calibrated, and device specifications are not guaranteed.

PXIe-5668

Setting this attribute to Low Side is supported for some frequencies in high band, varying by the final IF frequency. This configuration is not calibrated and device specifications are not guaranteed.

Note

This attribute is not supported on a MIMO session.

You do not need to use a selector string if you want to configure this attribute for all signal instances. Specify the signal name in the selector string if you want to configure or read that signal instance. Refer to the Selector String topic for information about the string syntax.

Default value:

  • PXIe-5663/5663E (frequencies < 3.0 GHz): High Side

  • PXIe-5663/5663E (frequencies >= 3.0 GHz): Low Side

  • PXIe-5665/5668: High Side

Supported devices: PXIe-5663/5663E/5665/5668

Name

Value

Description

RFMXINSTR_VAL_LO_INJECTION_SIDE_HIGH_SIDE

0 (0x0)

Configures the LO signal that the device generates at a frequency higher than the RF signal. This LO frequency is given by the following formula:fLO = fRF + fIF

RFMXINSTR_VAL_LO_INJECTION_SIDE_LOW_SIDE

1 (0x1)

Configures the LO signal that the device generates at a frequency lower than the RF signal. This LO frequency is given by the following formula:fLO = fRF – fIF