MOS switched-capacitor filters using voltage inverter switches

Low-sensitivity switched-capacitor filters imitating LC and LC /unit-element structures can be built by means of capacitances, ordinary switches, and voltage inverter switches, the latter being quite simply realizable by electronic means (either with or even without operational amplifier). There are no restrictions on the operating rate (other than those resulting from the Nyquist theorem) nor on the location of the attenuation poles. Experimental results of an integrated third-order lowpass filter are in good agreement with theory. The effects of parasitic capacitances can be overcome by using proper design techniques.

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