High accuracy CMOS switched-current ladder filters Public Deposited

http://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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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-02-19T18:21:46Z (GMT) No. of bitstreams: 1 HoeiJung-Sheng1992.pdf: 1362465 bytes, checksum: bd70d8a6e5c10f6fdc4650653a2dc73f (MD5)

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