Journal
IEICE ELECTRONICS EXPRESS
Volume 15, Issue 8, Pages -Publisher
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
DOI: 10.1587/elex.15.20180159
Keywords
replica-biasing source follower; open loop; fast response
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Funding
- National Natural Science Foundation of China [61404030]
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This paper presents a low-power reference voltage buffer with fast load transient response that can be used to drive capacitive loads. The circuit is based on an improved replica-biasing source follower structure that combines the high precision of the closed loop and the high bandwidth of the open loop, and it meets the requirements of high precision, fast load transient response for a sigma-delta modulator. The proposed circuit is implemented in 0.18 mu m CMOS technology provided by Semiconductor Manufacturing International Corp. (SMIC). The reference voltage buffer is combined with a sigma-delta modulator. The result shows that when the load capacitor is 10pF, the settle time is 134ns, the quiescent current is 81.5 mu A, and the chip area is 117 mu m x 220 mu m.
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