| 摘要 |
When using an operational amplifier having a small gain-band width product, in order to obtain a circuit having deep notch characteristics, a biquad filter includes first and second stages having inverse amplifiers and third and fourth stages having inverse integrators. Replacing a feed back resistor with an impedance element provides compensation. The compensating impedance element is a reactance, such as an inductor or capacitor connected to the feed back resistor.
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