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This paper presents a structure of a fourth-order cascaded full feed-forward Sigma-delta modulator. Because there is no feedback but only feed-forward path between two stages, cascaded sigma-delta modulator is unnecessary to consider the stability problems, and has the identical performance with ideal high-order single-loop sigma-delta modulator. The system level simulation results show that the signal...
In this paper, a design of high-performance fourth-order single-loop modulator applied in inertial sensor is described. This design employs the structure of feed-forward summation to reduce the output of the integrators and make the system more stable. Meanwhile, the modulator uses local feedback for zero optimization to improve the shaping capacity of the modulator noise within the signal bandwidth...
This paper presents an improved full differential low-voltage fourth-order Ong-band-pass sigma-delta modulator (Ong-BPSDM, proposed by Adrian K. Ong firstly) using a novel resonator based on Salo architecture. Compared with the reported Ong-BPSDM, the proposed fourth-order Ong-BPSDM utilizing a novel double-sampling and double-delay resonator which only needs one op-amp has a better performance with...
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