The Standard Report displays a cross-section of sensitivity and linearity information especially useful to receiver design. There are four basic groups on the report:
Project parameters are generally specified in the Project Properties dialog box; however, several of those parameter are made accessible on the Standard Report for convenience.
Sens. Loss
The loss in
sensitivity (dB) due to inefficiencies
in demodulator implementation.
Eb/No (S/N)
The margin (dB)
above the effective noise floor (MDS)
required to meet receiver sensitivity. For digital demodulation the margin
is in terms of the bit-energy to noise-density ratio; otherwise, the report
displays S/N (dB, Req’d) next
to the field to allow entry of the required signal-to-noise ratio.
BER
The bit error rate performance
required to meet receiver sensitivity. This field is only available for
digital demodulation. BER is mathematically related to Eb/No according
to the particular demodulation
scheme chosen for the project. Entering a value in either of these
fields causes the equivalent value to be computed and entered in the related
field.
Effective Noise Bandwidth (MHz)
The effective system noise bandwidth due to any filtering.
Demodulation Type
displays
the demodulation type selected in the Project
Properties dialog box. This information is repeated in this dialog
for convenience.
The Standard Report displays the power level (dBm) present at the system (page) input. If the current system page is linked to a component on a parent page, the input level field shows the power level propagated to the current page from the parent page. The current system temperature is also shown on this report. The system temperature is set in the Project Properties dialog.
The total system page DC power consumption is shown in this group. The individual components on the page determine the cumulative power consumption (see Component Properties).
System Sensitivity
The System Sensitivity group displays a variety of sensitivity-related parameters:
MDS
(Minimum Discernible
Signal) The input signal with a power level equal to the noise power present
at the system input. The input noise power is determined by the system
bandwidth, source temperature and effective system noise temperature,
and is computed as KB(Ts+Te).
Es/Eb
The ratio of the energy
per symbol to energy per bit. The effect of multiple bits per symbol must
be included to relate sensitivity to MDS. This parameter is zero for all
modulation schemes except QPSK and
/4 DQPSK in which case
the value is 3.01 dB.
Sensitivity
The minimum system
input level necessary to detect a signal.
Sensitivity (dBm) = Eb/No (Required) + Sens. Loss + MDS + Es/Eb (digital demodulation)
Sensitivity (dBm) = S/N (Required) + Sens. Loss + MDS (non-digital demodulation)
Effective Noise Temperature
The effective noise temperature of the cascaded components
and pages in degrees Kelvin.
Eb/No
The actual energy per
bit-to-noise density ratio due to the input level.
G/T (dB/K)
a figure of merit
used primarily in satellite communications. It is the ratio in dB of the
antenna gain to the sum of the receiver and antenna equivalent noise temperatures,
or
G/T is the same when computed at any reference plane within the system and is proportional to the system’s signal-to-noise ratio, S/N; thus any improvement to G/T constitutes an equivalent improvement to S/N.
System Linearity
The System Linearity Group displays the 3rd order intermodulation and compression performance of the associated page including linked pages, if any:
OIP3
(Output 3rd order intercept
point) The theoretical output level at which the third-order two-tone
distortion products are equal in power to the fundamental output signals.
IIP3
(Input 3rd order intercept
point) The theoretical input level at which the third-order two-tone distortion
products are equal in power to the fundamental input signals. IIP3 is
related to OIP3 by the gain of the component as
OIM3
The absolute output level
(dBm) of the two-tone spurious products.
ORR3
The output rejection
ratio or relative level (dBc) of the two-tone spurious products compared
to the desired signals.
IRR3
The amount the input
level must be increased (dBc) to raise the 3rd order spurious products
to the same level as the input before the increase. The initial input
level can be any desired level. When the system MDS is the reference point,
the resulting increase is known as the spurious free dynamic range.
SFDR3
Spurious Free Dynamic
Range - The difference between MDS and a two-tone signal level whose third-order
IM products are equal to MDS. This is a specific case of IRR3 defined
above.