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A Signal- and Transient-Current Boosting Amplifier for Large Capacitive Load Applications

A signal- and transient-current boosting (STCB) circuit is proposed and applied to a single-stage amplifier driving large capacitive loads. The proposed STCB circuit provides gain-bandwidth product (GBW) extension, slew-rate (SR) improvement and gain enhancement to the amplifier, with only slight al...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2014-10, Vol.61 (10), p.2777-2785
Main Authors: Mak, Kai Ho, Leung, Ka Nang
Format: Article
Language:English
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Summary:A signal- and transient-current boosting (STCB) circuit is proposed and applied to a single-stage amplifier driving large capacitive loads. The proposed STCB circuit provides gain-bandwidth product (GBW) extension, slew-rate (SR) improvement and gain enhancement to the amplifier, with only slight alterations to the frequency response and transient response of the single-stage amplifier driving large capacitive loads. No on-chip capacitor or resistor is required. The STCB amplifier is fabricated in a commercial 0.18-μm CMOS technology. The active chip area is 0.00705 mm 2 . The supply is 1.8 V, and the current consumption is 20.3 μA. The capacitive load (C O ) ranges from about 4.4 nF to 19 nF. The measured results with a ~ 19-nF load show the small-signal figure-of-merit (FOMS=GBW·C O /power) and the large-signal figure-of-merit (FOML=SR·C O /power) are 150345 MHz · pF/mW and 31213 V/μs·pF/mW, respectively, which correspond to improvements of 1.52 times and 1.36 times, respectively, to the prior art. The achieved phase margin and gain margin are 80.8 ° and 36.3 dB, respectively.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2014.2333364