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A novel class of filters (called pipe filters) that features in-band noise reduction is presented and a current mode biquad cell based on cross-connected cascoded devices is introduced. The presented solution gives in-band high-pass noise shaping and passive pre-filtering of out-of-band blockers. This results in both low in-band noise and high out-of-band IIP3. A 4th-order lowpass prototype in 90...
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