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A third order Gm-C reconfigurable Butterworth low-pass filter for SDR receivers with a tunable cutoff frequency of 5M to 50M is presented. A positive feed-forward compensation Gm-cell is utilized to improve the linearity of the filter. The filter has been implemented in SMIC 130nm CMOS process. It occupies 0.63 mm2 die area and consumers 12mA - 16mA current with a 1.2V power supply. The measured in-band...
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