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Integration of Passive RF Front-End Components in SoCs by Ahmad Mirzaei, Hooman Darabi

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8 M-phase Filtering and Duality

8.1 Introduction

M-phase filters offer high-Q filtering by frequency translation of low-Q baseband impedances to the clock frequency. These filters are placed typically at high-impedance RF nodes, and the quality factor of the resulting bandpass filtering at the RF is proportional approximately to this impedance. Low-impedance RF nodes cannot benefit from these M-phase filters for the following two reasons: (a) for a given quality factor, the required baseband capacitors (and, therefore, the filter size) is inversely proportional to this impedance; (b) the attenuation of the filter at far-out frequencies is equal to the ratio of this impedance to the switch resistance. For low-impedance nodes, the far-out attenuation ...

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