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Offset-compensated SC leapfrog filters can be realised as shown in the letter. The filters are parasitic-insensitive and the switches are controlled by a 3-phase clock. A 5th-order lowpass filter is given as an example.
Parasitic-insensitive wave SC filters can be realised, as discussed in the letter. If four nonoverlapping clock signals are used, the number of operational amplifiers can be made reasonably low. Experimental results of a fifth-order lowpass filter are presented.
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