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sampling device

A technology of sampling device and sampling switch, which is applied in the direction of electrical analog memory, instrument, analog/digital conversion, etc., can solve the problem of low linearity of sampling device and achieve the effect of improving linearity

Active Publication Date: 2019-07-02
CHONGQING GIGACHIP TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a sampling device to solve the problem of low linearity of the current sampling device

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Embodiment Construction

[0022] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the following describes the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings For further detailed explanation.

[0023] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.

[0024] see figure 1 , is a ...

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Abstract

A sampling device includes a switch capacitor circuit. First ends of two switches are respectively connected to an input signal. Second end of the first switch is connected to an upper plate of a first capacitor. Second end of the second switch is connected to a lower plate of a second capacitor. A connection node connecting a lower plate of the first capacitor to an upper plate of the second capacitor is connected to a power source. The first ends of a third switch and a fourth switch are respectively connected to an input common-mode voltage. A second end of the third switch is connected to the upper plate of the first capacitor. A second end of the fourth switch is connected to the lower plate of the second capacitor. The connection node is connected to the power source. Thus, an output common-mode voltage of the sampling device is adjustable.

Description

technical field [0001] The invention belongs to the field of signal sampling, and in particular relates to a sampling device with adjustable output common-mode voltage and capable of eliminating the second-order nonlinearity introduced by the voltage coefficient of sampling capacitance. Background technique [0002] With the continuous improvement of the quantization accuracy of A / D converters, the requirements for its linearity are also getting higher and higher. Sampling linearity is the decisive factor for the linearity of A / D converters, and a large number of application requirements require A / D Converters have low power consumption, therefore, high linearity, low power consumption sampling devices are required. However, the traditional sampling device usually produces second-order nonlinearity (that is, the sampled charge value includes a second-order term related to the input voltage) during the capacitance sampling process, resulting in low linearity of the sampling d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12
CPCH03M1/1245G11C27/024H03M1/0612
Inventor 李婷胡刚毅李儒章王健安张勇黄正波陈光炳王育新付东兵王妍袁浚
Owner CHONGQING GIGACHIP TECH CO LTD