Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

DC biasing for microstrip circuit. Feedthrough capacitor?

Status
Not open for further replies.
C

carevin

Newbie level 3
Joined
Feb 14, 2005
Messages
3
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
26
Hi
I am designing a DC biasing circuit for my microstrip board. I was told that a feedthrough capacitor should be included as part of this bias circuit. Does anyone have information on this?

I am using ADS to simulate my circuit. Is feedthrough capacitor available in the software?

Thank you very much for any help rendered.

Kevin
 

Re: DC biasing for microstrip circuit. Feedthrough capacitor

would y please tell me your problems in detils,because the capacitor of the feedthrough line is common!
 

For Amplifier you can use λ/4 line with Radial Stub !
 

Re: DC biasing for microstrip circuit. Feedthrough capacitor

I was wondering what is the use of a feedthrough capacitor. I have included λ/4 radial stub as part of bias circuit. Is it still necessary to include a feedthrough capacitor?
 

Re: DC biasing for microstrip circuit. Feedthrough capacitor

It's always safe to use feedthrough capacitors for the DC supply lines entiring the microstrip box. Radial stubs may short 'hot' RF on the DC supply lines to ground, but does not prevent direct coupling from the microstrip circuit to the DC supply lines entering at the box wall. Using feedthrough capacitors, this coupling will be effectively decoupled to ground.
 

Re: DC biasing for microstrip circuit. Feedthrough capacitor

Hi,

feedtrough capacitors are mounted on the box walls and bias is fed trough it into the box. It is actually a low-pas filter, it has encapsulated inductor in series and shunt capacitor(s) to ground. It is used to prevent any possible undesirable signals not completely filtered within the box to propagate trough bias wires to the rest of the system. Being a low-pass in nature, it might not be able to eliminate low frequency signals, e.g. 50MHz or so, and it is desirable to have some large capacitance to ground inside the box (the best is a paralell combination in the range of 10uF, 100nf, 1nF)

flyhigh
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top