Question 8.11: Using SPICE and Eq. (8.46), calculate the noise factor of th......
Using SPICE and Eq. (8.46), calculate the noise factor of the circuit in Ex. 8.10 (verify, once again, that it is 11).
F=\frac{total~ output~ noise~ power }{total~ output ~noise ~power -total~ output~ noise~ power~ with~ R_{s} ~noiseless} (8.46)
Step-by-Step
Again, as determined in Ex. 8.5, the total output noise power for this circuit is 1.5053 \times 10^{-14}\ V^{2}. If we simulate the noise performance of the circuit in Fig. 8.21 with R_{s} being noiseless, we get
Using Eq. (8.46), we get
F={\frac{1.5053\times10^{-14}}{1.5053\times10^{-14}-1.3685\times10^{-14}}}=11Simulating with a noiseless source resistor is the preferred way to simulate NF with SPICE.
TEMP=27 deg C
Noise analysis … 100%
inoise_total = 1.655918e-12
onoise_total = 1.368527e-14
Related Answered Questions
Question: 8.10
Verified Answer:
Using Eq. (8.41), the noise factor is 11 (NF = 10....
Question: 8.9
Verified Answer:
Let’s begin by adding the noise voltage spectral d...
Question: 8.6
Verified Answer:
The only element in this circuit that generates no...
Question: 8.5
Verified Answer:
The PSD of the noise currents are given by (again ...
Question: 8.3
Verified Answer:
Measured output noise usually includes the thermal...
Question: 8.9
Verified Answer:
Let's begin by adding the noise voltage spectral d...
Question: 8.19
Verified Answer:
With the input shorted, Fig. 8.43a, we get an inpu...
Question: 8.18
Verified Answer:
The schematic used for simulations is seen in Fig....
Question: 8.17
Verified Answer:
This amplifier is a transimpedance amplifier, that...
Question: 8.16
Verified Answer:
Using the numbers from the previous example, we se...