Agilent Technologies N8201A Service Manual download pdf (Page 328)

328 Agilent N8211A/N8212A Performance Upconverter Synthetic Instrument Module, 250 kHz to 20 / 40 GHz

10 Digital Modulation Commands

*RST 1

:POLarity[:ALL]

Supported N8212A

[:SOURce]:DM:POLarity[:ALL] NORMal|INVert|INVerted

[:SOURce]:DM:POLarity?

Selects normal or inverted I/Q signal routing. In inverted mode, the Q input is routed to the I

modulator and the I input is routed to the Q modulator, inverting the phase polarity.

NORMal Selects normal routing for the I and Q signals.

INVert (ed) Inverts the phase polarity by routing the I signal to the Q input of the I/Q

modulator and the Q signal to the I input.

Example

:DM:POL INV

The example swaps the I and Q routing paths.

*RST NORM

:SKEW:PATH

Supported N8212A

[:SOURce]:DM:SKEW:PATH RF|BB

[:SOURce]:DM:SKEW:PATH?

Selects the signal path that will be optimized using I/Q skew corrections. The other path

maybe degraded.

RF Optimizes the skew for the I/Q signal applied to the RF Output. The baseband (BB)

output will be functional, but the I/Q skew applied will be optimized for the RF path. While

in real-time mode, the maximum number of user symbols for the FIR is limited to 32.

BB Optimizes the skew for the I/Q signal outputs on the rear-panel. The RF Output will be

functional, but the I/Q skew applied will be optimized for the BB path. While in real-time

mode, the maximum number of user symbols for the FIR is limited to 32.

NOTE

You must have a skew calibration to use this command. I/Q skew corrections and

calibration must be performed at an Agilent factory or service center.

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Agilent Technologies N8201A Service Manual Page 328