Graduate Thesis Or Dissertation
 

DC notch filter offset cancellation for direct-conversion receivers

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s4655k542

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  • Direct-conversion architecture would dominate the modern low power wireless receiver architecture if problems such as offset cancellation, even-order distortion, and flicker noise were solved. Among those problems, offset is the most serious one. This thesis will discuss and analyze one approach to cancel offsets in direct-conversion receivers. First, we explain the motivation for designing fully-integrated direct-conversion receivers, followed by discussion the origin of offsets and their impact on performance. Then, the idea of using DC notch filters to remove offsets will be introduced. We will discuss their benefits and detriments. Finally, we will present our new ideas for making system level changes to improve overall performance. Tradeoffs among performance, bandwidth efficiency, and complexity of the receiver will be fully addressed. We believe a monolithic direct-conversion receiver will only be realized with intelligent integration of both system level engineering and circuit level design.
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