Improvements in sampled analog filters

Abstract

Abstract An integrator circuit of the type having an operational amplifier with an integrating capacitor (C1) in a feedback loop from its output to its input and having a switched capacitor (K0C1) as equivalent of a resistor connection between a signal source and said input, is characterized in that said switched capacitor is alternately discharged and connected between said signal source and said input with a predetermined frequency, by means of FET switches operated by clock pulses phi 1, phi 2. A second stage of similar form, but having its switches energised in a different sequence is connected in cascade with the first to provide a second order biquadratic filter. <IMAGE>

Inventors

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Bibliographic Details