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Thanks, SunnySkyguy, in this way, I am able to get low NF. My gain is around 17~19dB. By the way, I would like to ask another question, the formula which you use is as below:
NF = Gain + 10log(Input Noise Voltage/Output Noise Voltage)
Can I know why we can calculate using this method...
Can I know why I have a perfect short? The netlist I write, there are input, output, voltage source, and resistors. I am currently providing Vdd of 0.5V, from the output waveform, it is oscillating at about 0.49995V with an amplitude of 0.0028V.
Can I know how can I get SNR values using...
Currently I am trying to use ratio of SNR's in/out, where:
For input noise, it is equal to 9.1186f sq v/hz:
**** resistor squared noise voltages (sq v/hz)
element 0:r3
rs 9.1186f
For output noise, it is equal to 433.9253f sq v/hz:
**** total output noise voltage = 433.9253f sq v/hz
Hence...
Currently I am trying to simulate the noise figure, S11 and S22 parameters for LNA at 2.4GHz in HSPICE. Below is the code I used:
Calculate noise figure:
.ac dec 50 400MEG 3g
.NOISE v(vout) vin 1
Calculate S11 and S22:
.net v(vout) vin rin=50 rout=50
.print s11(db) s11(m) s11(p)
.print s22(db)...
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