Passive Noise Shaping Oversampling Successive Approximation Analog-to-Digital Converter and Control Method
An analog-to-digital converter, successive approximation technology, applied in analog-to-digital conversion, code conversion, instruments, etc., can solve the problem of limited noise suppression capability of noise shaping function, and achieve size reduction, noise suppression, and optimization of noise transfer. The effect of the function
Active Publication Date: 2022-06-21
XI AN JIAOTONG UNIV
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However, it adds two additional cycles to the conversion cycle of the original SARADC, and the in-band noise suppression capability of the noise shaping function implemented is very limited, only -3.5dB
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[0041] The following will refer to the attached Figure 1 to Figure 8 Specific examples of the present invention are described in more detail. Although specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.
[0042] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout ...
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Disclosed are a passive noise shaping oversampling successive approximation analog-to-digital converter and a control method. In the successive approximation analog-to-digital converter, the capacitive digital-to-analog converter generates a margin voltage on its upper plate through switching, and the passive loop filter It is configured to shape the residual voltage noise, wherein the residual acquisition capacitor for storing the residual voltage is connected to the first integrating capacitor and the second integrating capacitor for realizing passive gain to form a passive integrator, and the residual The collection capacitor is connected to the upper plate of the capacitive digital-to-analog converter, and the input terminal of the comparator is connected to the output terminal of the passive loop filter to receive the output voltage of the passive loop filter and convert the output voltage to The sum of the input voltage and the input voltage is quantized into a digital code, and the successive approximation logic digital circuit controls the switching of the capacitive digital-to-analog converter based on the digital code, and continuously generates each bit output of the successive approximation analog-to-digital converter from high to low in a successive approximation manner , until the entire quantization ends.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a margin feedback type passive noise shaping oversampling successive approximation analog-to-digital converter and a control method. Background technique [0002] Analog-to-digital converters (ADC) are used to convert natural analog signals into digital signals. According to the relationship between sampling frequency and input frequency, they can be divided into two categories: Nyquist rate ADC and oversampling ADC. One of the most widely used types of Nyquist rate ADCs is the Successive Approximation Register (SAR) ADC. The classic SARADC structure such as figure 1 As shown, because of its simple structure and a large proportion of digital circuits, the speed can be increased with the progress of the process node, and the power consumption is also reduced. However, due to comparator noise and DAC capacitance mismatch, it is difficult for SAR ADCs to achieve accura...
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IPC IPC(8): H03M1/38
CPCH03M1/38
Inventor 张韩瑞张鸿焦子豪金锴
Owner XI AN JIAOTONG UNIV