22.4 to 44.8 MHz 4th order low pass filter

Low-pass filter (LPF) is the 4th order Butterworth filter with cut-off frequency adjustment. There are two modes for cut-off frequency programming: manually or automatically. In automatic mode one of the circuits is used in an oscillator mode therewith the oscillation frequency correlates with the LPF frequency. High third-order input intercept point is reached due to using a pseudodifferential circuit and Sallen-Key circuit.

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