SC5305A Operating & Programming Manual
57
IF phase linearity deviation rate
................................................................................................ < 2 degrees/MHz
Figure 11. Phase deviation over 20 MHz.
-1000
-800
-600
-400
-200
0
60
65
70
75
80
p
h
ase
(d
e
gr
e
e
s)
IF frequency (MHz)
Ideal
measured
(13)
There are three IF attenuators in total, each having 30 dB of attenuation. There are two
attenuators in the final stage, and one attenuator in the first IF stage after the first mixer. How
to effectively use them to optimize for performance is outlined in the appropriate sections of
this manual.
(14)
These are typical gain specifications. The gain of the device is calibrated and stored in the
device calibration EEPROM.
(15)
Minimal gain is specified when all attenuators are set to their maximum values and the RF
pre-amplifier is disabled.
(16)
Maximum conversion gain is specified when all the attenuators are set to 0 dB attenuation.
(17)
Correction stored in the calibration EEPROM must be applied properly. Users are not
obligated to use the calibration provided, may devise their own method of calibration and
correction should they choose to. User methods of calibration and application may improve
on the accuracies specified.
(18)
For broadband signal operation it is recommended that users apply in situ amplitude and
phase equalization to the received signal to minimize amplitude and phase errors caused by
the device. Phase deviation at offset frequencies from the center frequency of 70 MHz is
stored in the calibration EEPROM. The calibration may be applied as a first order correction.