Hybrid /spl Sigma//spl Delta/ modulators with adaptive calibration

Jae Hoon Shim, In-Cheol Park, Beomsup Kim
2005 IEEE Transactions on Circuits and Systems I Fundamental Theory and Applications  
This paper describes an architecture for stable high-order 61 modulation. The architecture is based on a hybrid 61 modulator, wherein hybrid integrators replace conventional analog integrators. The hybrid integrator, which is a combination of an analog integrator and a digital integrator, offers an increased dynamic range and helps make the resulting high-order 61 modulator stable. However, the hybrid 61 modulator relies on precise matching of analog and digital paths. In this paper, a
more » ... s paper, a calibration technique to alleviate possible mismatch between analog and digital paths is proposed. The calibration adaptively adjusts the digital integrators so that their transfer functions match the transfer functions of corresponding analog integrators. Through behavioral-level simulations of fourth-order 61 modulators, the calibration technique is verified.
doi:10.1109/tcsi.2005.846229 fatcat:ljqnged4bjgdtkw3iln2axghsi