This is a thesis about implementation of a DS modulator with continuous-time
techniques. A methodology to obtain proper continuous-time (s-domain) transfer
functions for a continuous-time DS modulator has been presented. Different classes of
continuous-time modulators based on the DAC waveform in the DS loop and the number
of digital delays in the feedback loop have been recognized and analyzed. A new
structure for the LC-based DS modulators has been proposed. A fourth-order
transconductor-C modulator has been implemented in a 0.8mm BiCMOS technology.
Advantages and drawbacks of continuous-time modulators particularly with
transconductor-C technique have been investigated. A new transconductor-C filter and
further work are recommended to improve the performance of the current modulator.
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发表于 2008-5-1 17:08:56
