# MODELING AND SIMULATION FOR RF SYSTEM DESIGN

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CHARACTERIZATION FOR BOTTOM-UP VERIFICATION
263
design variable called switch_pos. For the sink a DC port is used. Figure 11-
19 shows the complete testbench with the inserted DUT and its parameters.
Figure 11-19. Testbench schematic
11.6.2
Analysis settings and simulation
The analysis types to use for the extraction of the specified parameters
can now be considered. The following combinations are proposed.
Gain
PSS
analysis
IP3 Two-tone PSS analysis with sweeping input power
Noise figure PSS/PNoise analysis
The design variables for the gain measurement are prf = -40 dBm, frf1 =
900 MHz, and frf2 = 0. The variable switch_pos is set to 1 to ensure that the
sinusoidal source is used for this measurement. The PSS analysis settings
include a beat frequency of 900 MHz. An output harmonic of 1 is sufficient
to calculate the gain at this frequency.
Now the first simulation run can be started. After simulation the gain is
plotted using the function power gain in the PSS results form. Figure 11-20
depicts a value of approximately 20 dB. In the ADE the analysis settings can
be saved in a first OCEAN script which is shown below.
simulator('spectre)
design("./simulation/LNA_PB_lab/spectre/schematic/netlist/netlist")
resultsDir("./simulation/LNA_PB_lab/spectre/schematic")
analysis('pss ?fund "900M" ?harms "1" ?errpreset "moderate")
desVar("frf2" 0)
desVar("frf1" 900M)
desVar("prf" -40)
desVar("switch_pos" 1)
save('i "/PORT0/PLUS" "/PORT1/PLUS" "/PORT2/PLUS")

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Summary :

## Gain PSS analysis IP3 Two-tone PSS analysis with sweeping input power Noise figure PSS/PNoise analysis The design variables for the gain measurement are prf = -40 dBm, frf1 = 900 MHz, and frf2 = 0.

Tags : analysis,gain,figure,pss,settings,simulation,power,measurement,now,ariable,900,design,frequency
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