Title：Analog-to-digital converter based on voltage-controlled oscillator and method for improving linearity of analog-to-digital converter
Country：China
Patent No.：202110811540.8
Legal Status：Under review
Inventor：Xinpeng Xing, Gaofeng Luan, Xueqian Shang, Xueting Zhao
Assignee：International Graduate School at Shenzhen, Tsinghua University
Address：Tsinghua Campus, Xili University Town, Nanshan District, Shenzhen City 518056, Guangdong Province
Filing Date：2021-07-19
Issue Date：
Abstract：
The invention discloses an analog-to-digital converter based on a voltage-controlled oscillator, which comprises: an amplifier module used for changing an input analog signal voltage and outputting a current signal; a current copying module connected with the amplifier module and used for receiving the current signal and outputting a VCO bias current equal to the current signal; an analog-to-digital converter module based on current control which is connected with the current copying module and used for receiving the VCO bias current and outputting a corresponding digital signal, and the amplifier module comprises an input control circuit and a negative feedback amplifier circuit; the input control circuit is used for controlling an input analog signal voltage; and the inverted input end of the negative feedback amplifier circuit is connected with the input control circuit, a current signal is output according to a signal output by the input control circuit, and the normal input end of the negative feedback amplifier circuit is grounded. The closed-loop negative feedback amplifier circuit is adopted to control the oscillation frequency of the annular voltage-controlled oscillator, so that the linearity is very high.
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