30 June 2005 10-bit 100-MS/s sample-and-hold amplifier adopting positive feedback technique
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Since a switched-capacitor sample-and-hold amplifier (SHA) has a feedback loop outside its op-amp, an op-amp with positive feedback technique (PFT) can be adopted to enhance the DC-gain of the op-amp. This paper proposes a positive feedback amplifier with dramatically increased DC-gain of 127-dB and reports that a SHA adopting proposed amplifier is stable by feedback operation. Measurement results demonstrated stable operation with spurious free dynamic range (SFDR) of 70-dB.
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Gil-Su Kim, Gil-Su Kim, Jae-Tack Yoo, Jae-Tack Yoo, Hoon-Jae Ki, Hoon-Jae Ki, Soo-Won Kim, Soo-Won Kim, } "10-bit 100-MS/s sample-and-hold amplifier adopting positive feedback technique", Proc. SPIE 5837, VLSI Circuits and Systems II, (30 June 2005); doi: 10.1117/12.608554; https://doi.org/10.1117/12.608554

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