Graduate Thesis Or Dissertation
 

High accuracy CMOS switched-current ladder filters

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/wp988n335

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  • Clock-feedthrough effects, channel-length modulation and device mismatch are the main causes of the inaccuracy of Switched-Current (SI) circuits. In this paper, these non-ideal effects are analyzed. A high-performance current mirror, namely regulated cascode current mirror, which eliminates drain voltage variation problem is introduced. By using this current mirror as a basic memory cell, a clock-feedthrough cancellation circuit is developed, which ideally solves the clock-feedthrough and drain voltage variation problems. A fifth-order SI lowpass Chebyshev ladder filter is built using the proposed cancellation circuit and implemented in a two-micron P-well standard digital CMOS process by MOSIS. Another emerging technique, dynamic current mirrors or current copiers, is introduced. Improved dynamic current mirror cell and dynamic current mirror-based integrators have been developed.
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