This is a circuit for high input impedance of the LH0033 and LH0063 are suitable for active filter applications. A basic two pole, high pass filter is diagrammed in circuit using the LH0033. Here’s the figure of the circuit;
This circuit provides a 10 MHz cutoff frequency. One consideration of the filter is its apparent gain change due to the finite output impedance of the amplifier, which affects the overall gain and the damping factor of the filter stage. Resistor R3 ensures that the input capacitance of the amplifier does not interact with the filter response at the frequency of interest. An equivalent low pass filter is similarly obtained by capacitance and resistance transformation. [Circuit diagram source: National Semiconductor Application]
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