If Frequency Response; If Phase Linearity - Keysight M9290A Manual

Description
a

IF Frequency Response

(Demodulation and FFT
response relative to the center
frequency)
Center Freq Analysis
(GHz) Width (MHz)
3.0
10 to25
>3.0, 26.5
10 to25
a.
The IF frequency response includes effects due to RF circuits such as input filters, that are a function of RF frequency,
in addition to the IF pass-band effects.
b. The maximum error at an offset (f) from the center of the FFT width is given by the expression  [Midwidth Error + (f
× Slope)], but never exceeds Max Error. Usually, the span is no larger than the FFT width in which case the center of
the FFT width is the center frequency of the analyzer. When the analyzer span is wider than the FFT width, the span is
made up of multiple concatenated FFT results, and thus has multiple centers of FFT widths so the f in the equation is the
offset from the nearest center. These specifications include the effect of RF frequency response as well as IF frequency
response at the worst case center frequency. Performance is nominally three times better than the maximum error at
most center frequencies.
c.
The specification does not apply for frequencies greater than 3.6 MHz from the center in FFT Widths of 7.2 to 8 MHz.
d.
The "RMS" nominal performance is the standard deviation of the response relative to the center frequency, integrated
across a 10 MHz span. This performance measure was observed at a single center frequency in each harmonic mixing
band, which is representative of all center frequencies; the observation center frequency is not the worst case center fre-
quency.
Description

IF Phase Linearity

Center Freq Span
(GHz) (MHz)
0.02,  3.0
10 to25
>3.0,  7.5
10 to25
a.
The listed performance is the standard deviation of the phase deviation relative to the mean phase deviation from a
linear phase condition, where the RMS is computed across the span shown.
66
Specifications Supplemental Information
b
Max Error Midwidth Error
c
(Exceptions ) (95th Percentile)
0.45 dB 0.12 dB
Specifications
Slope (dB/MHz)
(95th Percentile)
0.1
Supplemental Information
Deviation from mean phase linearity
Peak-to-Peak
(nominal) RMS (nominal)
1.0 0.3
1.0 0.5
d
RMS
(nominal)
0.03 dB
0.2 dB
a