auto tuning

R

RockeyMurad

Newbie
Joined
Dec 17, 2024
Messages
5
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
45
when we are trimming a resistor this permits us to use low tolerance capacitors C+ΔC what exactly is Δc and why we don't have to know it
 

Sort by date Sort by votes
I don't really understand your question. We can tune both resistors and capacitors, if neccessary. In the most of the capacitor-based circuits (for example, capacitive SAR ADC arrays, SC-amplifiers and filters) only the relation between capacitor values matters, i.e. C1/C0 etc. We can keep that relation by using unit-sized caps and matching them in layout.
For example:
C1 = 4*C0
So,
C1/C0 = 4*C0/C0 = 4
Let's add some parasitics:
(C1 + ΔC1)/(C0 + ΔC0) = 4*(C0 + ΔC0)/(C0 + ΔC0)
(4*C0 + 4*C0) /(C0 + ΔC0) = 4

Hopefully, that helps.
 

Upvote 0 Downvote
You must log in or register to reply here.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…