how do u calculate the SRF of a inductor,for example i have a 90Mhz oscillator,but i need a RF choke to block the RF from entering the other part of the circuit,so the SRF of the RF choke should be more than 90Mhz may be 110Mhz.,so how can i calculate the SRF,i make inductors by myself.so please help me out.
You cant directly calculate it, you can either get it from a datasheet of the part or you can measure it if you have a networkanalyzer and fixtures. You have to understand what the SRF really is, usually most inductors are not ideal parts, they have a inductance but also capacitance between the windings as well as package capacitance , those parasitic capacitances form a resonant circuit with the inductance , the resonance frequency of this circuit is the SRF ,if you knew the parasitic capacitance then you could calculate the SRF using thomsons equation !
I was in The Corps right as Vietnam was ending and the rule against laying hands on recruits was not yet in place. It is nothing like it was but I've heard from some more recent marines that things still happen but nothing like it used to be. I saw a guy get spin kicked when standing at attention in the barracks by a DI who was some kind of a kung fu badass and saw a number of recruits get punched. I personally got punched in the gut pretty hard. I also saw a guy get led around by a string tied around his dick on the parade field with his pants around his ankles for screwing up a marching formation. FYI my platoon also had a guy jump from our 3rd story barracks down to the hard deckwe never heard if he lived or died, nothing was ever told to us and the DI's just went ahead with training like nothing had happened. Parris Island was not for the faint of heart back then.
