1 to 200 MHz 3rd order low-pass filter with frequency adjustment system

The cell is based on 3rd order Butterworth low-pass filter (LPF) with cut-of frequency adjustment in a wide range. There are 2 modes for cut-off frequency programming: manual and automatically. The generator is used to control filter cut-off frequency in an automatic mode. Oscillator oscillation frequency correlates with cut-off frequency which can be fixed by digital code LPF_ctrl<6:0>.
There are 4 operation modes with different rated signal level under the same value of distortion. Greater level of signal corresponds to a higher current consumption.
It is possible to use several LPF with one generator for multichannel systems.
The block is fabricated on SMIC CMOS 0.18 um technology.

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