A Bootstrapped Analog Switch with Constant On-Resistance
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概要
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A bootstrapped analog switch with constant on-resistance is proposed for the successive approximation (SA) analog-to-digital converters (ADCs) that have many input-sampling switches. The initialization circuit, which is composed of a short pulse generator and a transmission gate, improves the linearity of the proposed bootstrapped analog switch by reducing the effect of the capacitive load. To evaluate the proposed bootstrapped analog switch, the 10-bit 1MS/s CMOS SA ADC with a rail-to-rail differential input signal was designed by using a 0.18µm CMOS process with 1.0V supply voltage. The proposed bootstrapped analog switch reduced the maximum VGS variation of the conventional bootstrapped analog switch by 67%. It also enhanced the signal to noise-distortion ratio of the SA ADC by 4.8dB when the capacitance of its gate node is 100fF, and this improvement was maximized when the capacitance of its gate node increases.
- 2011-06-01
著者
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Jang Young-Chan
School of Electronic Engineering, Kumoh National Institute of Technology
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Lee Yong-hwan
School Of Electrical Engineering And Computer Science And Inmc In Seoul National University
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Jang Young-chan
School Of Electronic Engineering Kumoh National Institute Of Technology
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KIM Sang-hun
School of Electronic Engineering, Kumoh National Institute of Technology
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CHUNG Hoon-Ju
School of Electronic Engineering, Kumoh National Institute of Technology
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Chung Hoon-ju
School Of Electronic Engineering Kumoh National Institute Of Technology
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Kim Sang-hun
School Of Electronic Engineering Kumoh National Institute Of Technology
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