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Using DC Block/Feed in ADS Schematic

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8_Bit_Apple

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When we design RF circuits at school (in the intro labs) we just stick DC Block components in front of the Term components and DC Feed components in between our biasing circuit and the actual circuit/amplifier. But is this realistic? It seems like once you actually want to design some usable circuit you would need to remove these and replace them with real values, right? If that is the case, then what's the point of these components? It seems like it just makes circuit design more difficult. Is this understanding correct?
 

DC Blocks which you place in labaratory is actually real capacitors which you use in circuits to prevent unwanted signals from entering to either port(terminal) of your device. Those components will be replaced by real inductors and capacitors serving the same purpose in your circuit.

When you talk about realistic, things get much more complicated; because now you have to think more than just designing(ie. tolerances of components effect your design, heat compensation techniques, so on so forth)
 

Even a DC block in real life has a model.If you would get a realistic results, you should always use equivalent models instead of ideal ones..
( I hope well understood your question )
 

8_Bit_Apple said:
If that is the case, then what's the point of these components?
Click to expand...

We often design from "raw sketch" to accurate, fine detail.
For the early steps, we need to keep away DC bias from the 50 Ohm terminals, that's what a DC block is good for in simulation.
 

Thanks guys, I guess my labs in school just neglected to follow through with designing the circuit completely (to use volker@muehlhaus's terminology, we never really got past the "raw sketch" to make our designs "accurate w/ fine detail"
 

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