Qualcomm Incorporated

Xiaoke Wen

Sameer Wadhwa

Dinesh Jagannath Alladi

Seyed Arash Mirhaj

Kentaro Yamamoto

Masoud Ensafdaran

Weihua Chen

Reducing signal dependence for a reference voltage of a CDAC includes: splitting a decoupling capacitor into a plurality of capacitors smaller in size than a size of the decoupling capacitor; isolating at least one of the plurality of capacitors from a sampling buffer coupled to the reference voltage during a conversion phase; and supplying an appropriate amount of charge needed to replenish charge drawn by capacitors in the CDAC at each conversion step using a charge pump to pump in a dummy charge to the CDAC so that resulting configurations of the CDAC draw substantially similar amount of charge for each code change of the each conversion step.

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San Diego, CA, United States of America

Xiaoke Wen