SC5305A Operating & Programming Manual
58
Dynamic Range Specifications
Spurious response
(19)
Residual spurious signals
(20)
............................................................................................................... < -100 dBm
LO related spurious signals
(21)
................................................................................................................ < -80 dBc
Image rejection
(22)
..................................................................................................................................... < -100 dBc
IF rejection
(23)
.............................................................................................................................................. < -115 dBc
Figure 12. Spectrum showing low LO related spurious signals for an input signal of 1000.15 MHz.
-100
-80
-60
-40
-20
0
995
997
999
1001
1003
1005
Pow
e
r
(d
B
c)
Frequency
1000.15 MHz carrier
10 MHz span
(19)
Spurious responses are unwanted signals appearing at the IF output. All spurious products
are referenced to the RF input, meaning that they are treated as if they originate at the input
port of the device.
(20)
Residual spurious signals are observed and referenced to the RF input of the device when
the RF input is terminated with a matched load. The RF and first IF (IF1) attenuators are set
to 0 dB attenuation and the final IF attenuators were adjusted to obtain an overall device
gain of 20 dB. The preamplifier is disabled.
(21)
LO related spurious signals are unwanted signals produced at the IF output due to inter-
modulation of the local oscillators. These spurious signals are measured relative to an RF
signal present at the input. The specification referenced here is for a device configuration of
-20 dBm at the mixer, 0 dBm at the IF output, and a total gain of 20 dB.
(22)
Image rejection is the ability of the device to reject an image signal of the RF frequency that
would otherwise produce the same result as the desired RF signal. The image of the desired
RF signal is calculated as
, where
.
(23)
IF rejection is the ability of the device to reject RF signals at any of the IF frequencies while
the device is tuned elsewhere. Signal level at the mixer is -20 dBm and total gain is 20 dB.