A Dynamic Source-Follower Integrator and Its Application to ΔΣ Modulators

Ryoto YAGUCHI  Fumiyuki ADACHI  Takao WAHO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.5   pp.802-806
Publication Date: 2011/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.802
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Fundamentals and Applications of Advanced Semiconductor Devices)
Category: 
Keyword: 
switched-capacitor,  integrator,  analog-to-digital converter,  delta-sigma modulator,  

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Summary: 
A switched-capacitor integrator based on dynamic source follower amplifiers has been proposed. Integrator operation has been confirmed and analyzed by assuming 0.18-µm CMOS technology. The integrator can reduce the number of elements considerably compared with conventional ones using operational amplifiers. As a result, the power dissipation of proposed integrator can be reduced to approximately one-eighth that of conventional integrators. The integrator is applied to a second-order ΔΣ modulator, and its successful operation has been confirmed by transistor-level circuit simulation.