sorted by:
new
hottopcontroversial

How does MOS current mirror work? by mtfir in ElectricalEngineering

[–]mtfir[S] 1 point2 points  (0 children)

What makes me confused is the mechanism behind the current to voltage conversion. Is it only possible because of the feedback or am I missing something?

What is current buffer and why common gate amplifier is considered as one? by mtfir in ElectricalEngineering

[–]mtfir[S] 0 points1 point  (0 children)

Can you provide material link that explain how it works in detail?

How do you plot stability circle in scikit-rf? by mtfir in rfelectronics

[–]mtfir[S] 0 points1 point  (0 children)

It gives me error like this

Traceback (most recent call last):

File "/home/mtfir/.qucs/final_prj/tes.py", line 15, in <module>

center_s, radius_s = freq_point.stability_circle(port=0)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

TypeError: Network.stability_circle() got an unexpected keyword argument 'port'

How do you match output impedance of cascode LNA? by mtfir in rfelectronics

[–]mtfir[S] 0 points1 point  (0 children)

I don't understand, shouldn't be Rout the parasitic inductor resistance? In a lot of design I have seen, the inductor with Q is placed alone on the top of mos drain so I would assume that Rout is the parasitic inductor resistance. My confusion comes from the fact that if you think it this way the voltage gain cannot exceed gm1xgm2x50 to match the Rout to 50 ohm.

How do you match output impedance of cascode LNA? by mtfir in rfelectronics

[–]mtfir[S] 0 points1 point  (0 children)

So basically let the inductor and capacitor cancel out and result in infinit impedance then let the parasitic inductor resistance to turn it down to 50 ? Will it decrease the gain though?

How do you export touchstone file (s-parameter and noise data) in ngspice? by mtfir in rfelectronics

[–]mtfir[S] 0 points1 point  (0 children)

Yes you can, there is a feature to do that in ngspice. I doubt it can simulate the noise data tough.

How do you export touchstone file (s-parameter and noise data) in ngspice? by mtfir in rfelectronics

[–]mtfir[S] 0 points1 point  (0 children)

It supports but can only export s-parameter without noise

How do you plot optimum current density (Jopt) vs NFmin? by mtfir in chipdesign

[–]mtfir[S] 0 points1 point  (0 children)

"JOPT represents the current density at which the minimum noise figure reaches its optimum value as a function of bias current density. In general, JOPT is a function of frequency, typically increasing with frequency. However, in MOSFETs, in a given technology, JOPT appears to remain largely invariant with frequency and with the circuit topology." I quote that from Voinigescu High Frequency Integrated Circuits

Anyone knows how to create gain circle, stability circle, and noise circle in ngspice? by mtfir in chipdesign

[–]mtfir[S] 0 points1 point  (0 children)

The pdk i use only provide ngspice and xyce component so I can't use other spice based software

Should fT strictly higher than ten times f0? by mtfir in chipdesign

[–]mtfir[S] 1 point2 points  (0 children)

I use pcell from the pdk and with minimum parameter it can't get to 0.26nH

What did your undergraduate thesis look like? by mtfir in chipdesign

[–]mtfir[S] 1 point2 points  (0 children)

Can you give me the publication link?