Thanks for your reply !!!I have used switched capacitor charge pumps in many designs for a low current negative supply. Converting +5v to -5v for example.
Only one ic is required.
In operation, an oscillator drives some analog switches that toggle between the input and output of the supply. The capacitor is first connected to the input (+5v) an then switched to the output of the supply except with the positive side of the switched capacitor connected to ground. The negative side of the capacitor is switched to the negative side of the supplies output. This results in a negative output voltage. An output capacitor is used to hold the charge up during the switch cycles.
Switched capacitor designs are also used for filters, this is much more involved.
Thank you so much !!!Hello,
Charge pump circuits are mainly used as DC-DC converters:
Switched capacitor circuits can be used as filters:
For the switched capacitor filter circuits, you can also have a look at the attached LMF100 datasheet.
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by Jake Hertz
by Jeff Child
by Jeff Child