Design and analysis of two high-speed high dynamic-range track-and-hold amplifiers are presented in this paper using 65-and 90-nm CMOS processes. To achieve remarkable circuit performance in the advanced CMOS regime, the cascode topology with an inductive peaking technique and the distributed topology are employed in the track-and-hold amplifiers. The circuit topology is investigated to obtain the design methodology of the CMOS high-speed high dynamic-range track-and-hold amplifier. The theoretical calculation is presented to completely verify the design concept. Moreover, the proposed CMOS track-and-hold amplifiers demonstrate wide bandwidth and good linearity. With a dc power consumption of 197 mW, the 65-nm CMOS track-and-hold amplifier features an input bandwidth of up to 7 GHz, a spurious-free dynamic range (SFDR) of 44.6 dB, and a total harmonic distortion (THD) of 44.5 dB.
With a dc power consumption of 216 mW, the 90-nm CMOS track-and-hold amplifier features an input bandwidth of 19 GHz, an SFDR of 47.5 dB, and a THD of 44.5 dB. The proposed CMOS track-and-hold amplifiers are suitable for the high-resolution high-speed analog-to-digital converter with low dc supply voltage and power.
Index Terms-CMOS, high-speed analog CMOS design, RF and mixed-signal integrated circuit (IC) design, RF front ends, sampling circuits.
0018-9480Kevin Chen received the M.S. and Ph.D. degrees in electrical and electronic engineering from the University of Bristol, Bristol, U.K., in 2006. He is currently with the Industrial Technology Research Institute (ITRI), Hsinchu, Taiwan, where he was involved in the digital RF receiver design and high-efficiency polar transmitters design. He currently leads an advanced analog and mixed-signal integrated circuit (IC) design team towards the development of high-speed high-resolution analog-to-digital converters (ADCs) and digital-to-analog converters (DACs).
In this study, we design and present a five-fold digital slit-lamp microscope (DSLM) with built-in photographic lens and CCD. The initial structures of the front objective, Galilean telescope system, and photographic lens are systematically investigated and discussed in the design. A progressive optimization process is employed in the non-coaxial system design after the coaxial system achieves high performance. The analysis of spot diagrams and the modulation transfer function (MTF) show that this DSLM optical system achieves quasi-diffraction-limited performance and enables high-quality imaging for ophthalmic examination. Furthermore, tolerance analysis of this optical system is also performed, which provides a theoretical basis for machining and assembly. This design provides an idea for the design of a digital-zoom microscope in biomedical imaging instruments.
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