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.

how capacitor in series with resistor to gnd forms a pole or zero ?

sneha rayala

Newbie level 4
Joined
May 17, 2022
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
63
How Does connecting a resistor in series with capacitor form zero. can someone please elaborate. Got this doubt when I was studying compensation of LDO using ESR resistance .2
Thank you :)
 

sutapanaki

Advanced Member level 4
Joined
Nov 2, 2001
Messages
1,327
Helped
514
Reputation
1,028
Reaction score
474
Trophy points
1,363
Location
US
Activity points
10,981
Imagine the frequency behavior of the series combination of R and C. For low frequencies it is the cap impedance that dominates. At high frequencies it is the R. This can be decomposed as an integrator type of responce from the cap only and a response that has a zero at 1/RC as in the drawing.

1653074227340.png
 

danadakk

Advanced Member level 5
Joined
Mar 26, 2018
Messages
1,747
Helped
283
Reputation
580
Reaction score
373
Trophy points
83
Activity points
7,943
Taking BigBoss's Z expression

Z = {s + 1/RC} / s/R so the pole is at 0 and the zero is at -1/RC

So if you are walking around the complex plane the zero is in LHP and
the pole at 0,0. So exponentially decaying response.


1653088144930.png



Regards, Dana.
 

LaTeX Commands Quick-Menu:

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top