A “capacitance multiplier” circuit can increase the effective value of a small capacitor C1 to a much larger value. The capacitance seen at Vout is: Cout = C1 * R1/R3. Note that this circuit is only for a ground- referenced capacitor. Rs = R3. The output capacitance can be verified by placing an AC source in series with a resistor tied to Vout and running an AC frequency response analysis. As seen in the result below, the 100pF capacitor has been multiplied by 1,000. Bypass capacitors are not shown. (From a NSC app note) /Circuit is created by Neil P. Albaugh TI- Tucson/
Capacitance Multiplier Circuit:
Creation and Simulation of a Capacitance Multiplier Circuit
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