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transistor circuits Interview Questions

Interview Question in transistor circuits

DCTL ( Direct-Coupled Transistor Logic) Anyone
Hi there! currently i'm working on a report on DCTL's and it seems that there is hardly any information available on the web right now. Can anyone give me a good reference site? The area i live in only has so-so references, hence my presence here right now :). And if possible, can anyone help me out? All I actually need to know left is how it operates, how it fares compared to other switching transistor circuits in the logic families (DTL,HTL,TTL..), and examples of DCTL's that are currently available in the market. Any help would be greatly appreciated. ;)

Is there a simple, intuitive way to design transistor circuits
For the clever engineers...its obviously to design transistor/amplifier circuits with complex math tools (Spice, matrix equations, etc) Is there a drastically simpler way to do this? What I had in mind is a more intuitive approach and just building it up piece by piece without resorting to complex full circuit analysis. I often see these extremely complex circuits (eg like the inside of an Op Amp) and think, how could I break this up and figure it out in a few minutes without some horrendous difficulty? What might a simple approach look like? Im not adverse to a little math...but something drastically simpler. Thanks for any intuitive insights.

Among Common Emitter amplifier and OP-AMP, which one gives more amplification and why
An operational amplifier (op-amp) certainly has much much larger amplification and the output can easily saturate without negative feedback. Op-amp's are rigorously designed multi transistor circuits with careful control over biasing of transistors involved while a CE amplifier would easily go into saturation/triode or cut-off regions if you try to tweak the gain too much.

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