MODELING OF ANALOG BLOCKS IN VERILOG-A
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Figure 10-3. AC response of the LNA
Figure 10-4 shows the noise figure (NF) of the model according to the
parameter fnoise = 5 dB. The noise figure is the ratio of SNR
in
to SNR
out
and
is usually expressed in terms of dB. Using SpectreRF the noise figure could
be calculated with the PNoise analysis, which is a periodic small-signal
analysis. In circuit level models the noise figure depends on the frequency.
Figure 10-4. Noise figure of the LNA
The next LNA parameter is the 3rd order Intercept Point (IP3). The
measurement results are achieved by a combined PSS/PAC analysis using
two tones of 1 kHz and 1.1 kHz. Figure 10-5 depicts the IP3 of
approximately 1.9 dBm. A detailed explanation of the IP3 can be found in
Section 11.2.
Summary :
AC response of the LNA Figure 10-4 shows the noise figure (NF) of the model according to the parameter fnoise = 5 dB.
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