Baseband I/Q Remote Language Compatibility - Keysight x-series User Reference Manual

The input is a context and some parameters have separate values for each context. The SCPI for these
parameters has an optional "[:RF|IQ]" node. If the specific context is omitted, the command acts on the
current input context's value. Here are the parameters that are input context sensitive:
• Center Frequency
• Trigger Source
It is important to distinguish between the I and Q input ports and the displayed I and Q data values. The I
and Q input ports feed into a digital receiver that does digital tuning and filtering. The I and Q data seen by
the user (either on the display or through SCPI) corresponds to the real ("I") and the imaginary ("Q") output
from the digital receiver. When the input path is I+jQ or I Only and the center frequency is 0 Hz the I input
ends up in as the real output from the receiver and appears as "I" data. Likewise, when the input path is
I+jQ and the center frequency is 0 Hz, the Q input ends up as the imaginary output from the receiver and
appears as "Q" data. However, when the input path is Q Only, the Q input is sent to the receiver as Q+j0, so
the receiver output has the Q input coming out on the real output, and so in Q Only, the signal from the Q
input port appears as the "I" data. Another situation where the I and Q data do not necessarily correspond
directly to the I and Q inputs is when the center frequency is non-zero. The digital processing involved in
the tuning is a complex operation. This will result in I Only data appearing as both "I" and "Q" data, the
same as that signal would appear if seen through the RF input port.

Baseband I/Q Remote Language Compatibility

For the Agilent E4406A VSA Series Transmitter Tester, Option B7C provided baseband I/Q inputs. Code
compatibility has been provided to allow many of the commands for option B7C to function properly with
the X-Series. The X-Series has hardware differences and additional capabilities (e.g., E4406A does not
have independent settings of I & Q nor does it provide for probe calibrations) which make 100%
compatibility impossible.
1. The following commands are supported:
:CALibration:IQ:FLATness
:INPut:IMPedance:IQ U50|B50|U1M|B1M
:INPut:IMPedance:REFerence <integer>
2. The [:SENSe]:FEED RF|IQ|IONLy|QONLy|AREFerence|IFALign command supports all parameters except
IFALign. The FEED? query will return only RF|AIQ|AREF.
3. The following commands are not supported:
:CALibration:GIQ
:CALibration:IQ:CMR
:INPut:IQ:ALIGn OFF|ON|0|1
The Rohde & Schwarz FSQ-B71 also provides baseband I/Q inputs. A certain amount of code compatibility
is provided in the X-Series, however hardware differences make this a somewhat limited set.
Supported:
The "<1|2>" is supported as "[1]".
INPut<1|2>:IQ:BALanced[:STATe] ON | OFF
EMI Receiver Mode Reference
4 Input/Output Functions
Input/Output
159