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

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4 Four-Phase High-Q Bandpass Filters

4.1 Introduction

In the previous chapter, we saw that a simple passive mixer driven by 50% duty-cycle clocks converts a low-Q baseband impedance to a high-Q bandpass impedance through frequency translation. The center of this high-Q bandpass impedance is controlled precisely by the clock frequency, making it very attractive for reconfigurable receivers in which it is desirable to have high-Q bandpass filters with centers that can be tuned over a wide range of frequencies. Being implemented with just switches and capacitors, the resulting high-Q filter is exceptionally linear, and because the switches carry no DC, there is no major flicker noise issue. We saw, however, that this filter has the problem of ...

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