Graduate Thesis Or Dissertation
 

A programmable BiCMOS transconductance-capacitor filter for high frequencies

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gb19f952c

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  • With advancements in CMOS technology, high speed analog circuits that were traditionally implemented with discrete circuit components can now be made monolithically. Antialiasing filters for video signals as well as signal conditioning filters in high speed communication channels are examples of applications where high frequency integrated circuits are now feasible. Transconductance-Capacitor or Gm-C filters are well suited to these applications as they operate in the continuous-time domain and are able to overcome the high-frequency and noise limitations imposed by clocked filter topologies. This thesis covers the design of a programmable fourth-order Chebychev filter with a 50MHz passband using the transconductance-C technique. A previously proposed transconductor based upon a CMOS inverter is used to implement the filter. Since this transconductor has no internal nodes, it can achieve extremely high bandwidths. However, it requires a variable power source for programming. Thus, a wide-band, on-chip, variable-BiCMOS power supply is presented as the method for setting the transconductance. Practical design issues are addressed as well as many methods for compensating non-idealities. Simulations of the filter as well as some parametric measurement of the filter structures are presented.
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