i am very new in switched capacitors stuff,i know that SC filters are nowadays very popular,and also know that f and c can generate the resistance,but how did the switched cap generate the cut off frequency of filters?as far as i know,all the poles need R and C,where is the C come from in the switched caps?
i am very new in switched capacitors stuff,i know that SC filters are nowadays very popular,and also know that f and c can generate the resistance,but how did the switched cap generate the cut off frequency of filters?as far as i know,all the poles need R and C,where is the C come from in the switched caps?
There ARE capacitors in switch-cap filters. Since you know the frequent capacitor charging process acts as the resistance, the capacitor next to the "resistor" are the C in RC time and thus cut-off frequency.
u mean ,it's some caps in the switch for example,or the switched cap itself,if the RC time is 1/f,then divide R,we get that C,thus switch cap itselp,sorry,i did not quite get u
There are lots of papers and other contributions to find in the internet about SC circuits. The principle of R replacement by a switched (periodically loaded and deloaded) capacitor is not hard to understand.
As one example, have a look at the document attached.
Regards and good luck.