SELECTED RF BLOCKS IN VHDL-AMS
139
Input and output impedances are modeled as ohmic resistances. Typical
values of a matched system are
50
in
out
R
R
Often you will find these characteristics expressed in terms of the S-
parameters.
Additional characteristics, that were not modeled here, include second
order effects such as temperature and power supply dependency of the gain
function, recovery time after output limitation, higher order nonlinearities,
and power consumption. Also, noise contribution of the amplifier stage is
not included in the model since noise quantities are not supported by
ADVance MS.
Model interface
Figure 7-10. Schematic symbol of the low-noise amplifier
Table 7-11. Model ports
Name Type
Description
P_IN ELECTRICAL
Input
pin
P_OUT ELECTRICAL
Output
pin
VDD ELECTRICAL
Supply
voltage
GND ELECTRICAL
Reference
node
Table 7-12. Model parameters
Name
Unit
Default value Description
GP_DB
dB
0.0
Open loop power gain
IP3_DBM dBm
-30.0
Referenced
IP3
FNOISE_DB dB
0.0
Noise figure of stage
FG
Hz
real'HIGH
Frequency of dominant pole
RIN Ohm
50.0 Input
resistance
ROUT Ohm 50.0
Output
resistance
Summary :
Model parameters Name Unit Default value Description GP_DB dB 0.0 Open loop power gain IP3_DBM dBm -30.0 Referenced IP3 FNOISE_DB dB 0.0 Noise figure of stage FG Hz real'HIGH Frequency of dominant pole RIN Ohm 50.0 Input resistance ROUT Ohm 50.0 Output resistance
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