Title：Continuous time Sigma Delta modulator and multimode configuration method thereof
Country：China
Patent No.：201310309066.4
Legal Status：Authorized
Inventor：Baoyong Chi, Yang Xu, Zhihua Wang
Assignee：Tsinghua University
Address：Tsinghua University,Haidian District Beijing 100084, China
Filing Date：2013-07-22
Issue Date：2017-05-24
Abstract：
The present invention discloses a continuous time Sigma Delta modulator and a multimode configuration method thereof, and belongs to the field of analog-digital converters. The modulator includes an I channel and a Q channel having the same circuit structure, wherein structurally, each of the I channel and the Q channel includes a configurable active loop filter, an analog adder and a quantizer which are all sequentially connected in series; each of the I channel and the Q channel further includes a plurality of switches; and cross coupling resistors and control switches are connected between the I channel and the Q channel, and the mode of the Sigma Delta modulator can be configured through adjusting the switches in each of the I channel and the Q channel and the switches between the two channels. The continuous time Sigma Delta modulator disclosed in the present invention has the characteristic of configurable multiple modes, can be flexibly configured to work at multiple bandwidths and realize two modes: a low-pass mode and a complex band-pass mode, so that the modulator can be applied to a multiple-communication-standard receiver. Also, the continuous time Sigma Delta modulator helps to optimize power dissipation under different bandwidth applications while integrating various calibration techniques to improve the performance index of the modulator.
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