Analog-to-digital converter circuits, analog-to-digital converters, and electronic equipment

Abstract

The present application proposes an analog-to-digital converter circuit, an analog-to-digital converter, and electronic equipment, the analog-to-digital converter circuit, and the analog-to-digital converter circuit, including: a fully parallel ADC, which is connected to the analog signal to be converted, and the analog signal is connected to the analog signal. The signal is quantized to obtain the first quantized signal; the first-stage SAR ADC is connected to the analog signal, and the control end of its highest-order capacitor is connected to the fully parallel ADC, and the residual signal generated based on the analog signal and the first quantized signal is analyzed. Perform quantization, and obtain the second quantized signal; the second-stage SAR ADC, quantizes the access quantized signal again, to obtain the third quantized signal; the intermediate capacitor amplifier is set between the first-stage SAR ADC and the second-stage SAR ADC is used to amplify the second quantized signal by a specified multiple, and input the amplified quantized signal to the second-stage SAR ADC. By applying the present application, an ADC with a higher physical number of bits can be realized, and the conversion accuracy of the analog-to-digital converter circuit can be improved.

Description

technical field [0001] The present application belongs to the technical field of analog-to-digital conversion circuits, and in particular relates to an analog-to-digital converter circuit, an analog-to-digital converter and electronic equipment. Background technique [0002] Analog-to-digital converters (ADCs) can convert analog signals into digital signals and are the key means to obtain information about nature. As an important medium for obtaining information, ADC is widely used in wireless communication, industrial measurement, image recognition and other fields. With the further development of science and technology, there are more and more requirements for efficient acquisition of information in various fields, and the demand for high-speed and high-precision ADCs continues to increase. [0003] There are many types of ADCs, including: Sigma-Delta (Σ-Δ modulation) type, integral type, SAR (Successive Approximation, successive approximation) type, pipeline (pipeline) t...

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Problems solved by technology

[0004] Most of the existing Pipeline SAR ADC architectures include two SAR ADCs and an intermediate capacitor amplifier arranged between the two SAR ADCs. However, the ADC architecture often has the following defects. First, the pipeline SAR has a physical number of bits It is difficult to implement a 13bit-15bit ADC; second, the output swing of the intermediate stage op amp is the difference between the two reference voltages (vrefp1 and vrefn1) of the previous stage SAR ADC, which is a large voltage difference and will consume a lot of voltage margin, thereby increasing the power dissipation requirements of the op amp

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