Analysis and Design of Analog Integrated Circuits
Analysis and Design of Analog Integrated Circuits
Operational Amplifier Speed and Accuracy Improvement: Analog Circuit Design With Structural Methodology (KLUWER INTERNATIONAL SERIES IN ENGINEERING AND COMPUTER SCIENCE)
A rapid power-switchable track-and-hold amplifier in 90-nm CMOS
IEEE Transactions on Circuits and Systems II: Express Briefs
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Conventionally, source followers have been used at the block of track-and-hold amplifiers (THA) for high-speed medium-bit analog-to-digital converters (ADCs). Even though the input signals of an ADC are fully differential, two single-ended source followers should be normally used. This is because differential source followers have some drawbacks. In this study, a wideband fully differential source follower is presented to obtain maximum efficiency of a fully differential THA. Because a cross coupling technique at the differential nodes is adopted, the performance of the proposed source follower is superior to the performance of conventional followers. A small signal analysis is discussed to compare the performance. The result of Spurious Free Dynamic Range (SFDR) is 驴66.92 dBc for F in = F s/2 at F S = 500 MHz. The SFDR of the proposed source follower is better by about 8.6 dB than the SFDR of a conventional source follower under the same experimental conditions. To verify them, an 8-b ADC which includes the proposed source follower is fabricated with a 0.13 μm CMOS technology.