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In the data sheet of a 400 MHz transistor I found fall time = 60 ns. Clearly these are contradictory specifications
- trise and tfall should be at least an order of magnitude shorter.
Should I believe that fT is specified correctly? (e.g. 2SA2088FRAT106Q transistor).
Chopper amplifier of microvolt DC signals
I understand that a chopper keeps flipping the input DC signal so that an AC signal is obtained and amplified.
But to do it with microvolt signals requires using noise-free switches. The only relatively noise-free method of
switching that comes to my...
With the specific inductance of the order of 1 microHenry/m and specific capacitance 100 pF/m it is hard to believe low attenuation at GHz range. To get a brutal estimate, consider length = 1m and ω = 6 Grad/s - then we are dealing with 6kΩ of inductive reactance and with 1.66 Ω of capacitive...
High inductive impedance and low capacitive impedance of coaxial cables make it unbelievable that with proper resistive termination R such a coaxial cable behaves like a lossless line with the resistance R at the end.
Do HF probes in oscilloscopes brutally amplify signals to make up for...
In the response of dick freebird above there is the statement:
"GIDL (gate induced drain leakage) is a thing in some types
of MOSFETs (though I've seen it more in integrated, plain
FETs). That means after some distance into negative Vgs,
drain current increases from its minimum."