Pipelined-SAR ADC and method for eliminating influence of reference voltage fluctuation

Abstract

The invention discloses a Pipelined-SAR ADC and method for eliminating influence of reference voltage fluctuation, and the Pipelined-SAR ADC comprises a first group of reference voltage Vref1, a second group of reference voltage Vref2, a sampling holding circuit, a first-stage SAR ADC, a second-stage SAR ADC, a digital logic, a switch S3 and a residual voltage amplifier, the first group of reference voltage Vref1 is connected to a high-section capacitor array side of a first-stage CDAC of the first-stage SAR ADC through a switch S1, and the second group of reference voltage Vref2 is connected to a second-stage CDAC of the second-stage SAR ADC through a digital logic. The second group of reference voltage Vref2 is also connected to the high-section capacitor array side on the first-stage CDAC of the first-stage SAR ADC through the switch S2, both the switch S1 and the switch S2 are controlled by digital logic signals, and the method for eliminating the influence of the reference voltage fluctuation is realized on the Pipelined-SAR ADC.

Description

technical field [0001] The invention relates to the fields of integrated circuit technology and the like, and in particular, relates to a Pipelined-SAR ADC and a method for eliminating the influence of reference voltage fluctuations. Background technique [0002] With the continuous development of digital signal processing technology and semiconductor manufacturing technology, advanced electronic systems have emerged to meet the needs of various applications, which has also brought an urgent need for high-precision analog-to-digital converters (ADCs). Pipelined successive approximation register analog-to-digital converters (Pipelined-SAR ADCs) are widely used due to their high energy efficiency, high speed, high linearity and high precision. [0003] The traditional pipeline successive approximation register-based analog-to-digital converter (Pipelined-SAR ADC) consists of two SARADCs, a residual voltage amplifier and two sets of reference voltages (for easy distinction, nam...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a Pipelined-SAR ADC and method for eliminating the influence of reference voltage fluctuations. The Pipelined-SAR ADC innovates on the traditional pipelined successive approximation register analog-to-digital converter, and does not use decoupling capacitors. In some cases, through the special design of the capacitor array and the reference voltage connection method, the problem of "the deterioration of ADC linearity and accuracy due to fluctuations in the reference voltage related to the input signal" is solved, which ultimately saves chip area and enables Pipelined -SAR ADC achieves high linearity and precision;

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