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High-precision sampling switch adopting grate source tracking technology

A sampling switch, high-precision technology, applied in electronic switches, electrical components, pulse technology, etc., can solve the problems of increasing the apparent capacitance of the analog input of the sampling and holding device, reducing the input bandwidth of the sampling and holding device, etc., so as to reduce the parasitic capacitance. , reduce charge, improve the effect of gate-source boost voltage

Active Publication Date: 2009-09-30
JIANGSU JINSHENGYUAN SPECIAL VALVE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the capacitance of C3 can increase the voltage of the gate terminal and source terminal of the sampling switch MN8, but a larger C3 also increases the apparent capacitance of the analog input of the sampling and holding device, reducing the input bandwidth of the sampling and holding device

Method used

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  • High-precision sampling switch adopting grate source tracking technology
  • High-precision sampling switch adopting grate source tracking technology
  • High-precision sampling switch adopting grate source tracking technology

Examples

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Gate-source follower technology (Bootstrap) switch circuit, including clock multiplication circuit, gate voltage conduction switch and gate-source follower sampling switch. a. A clock multiplication circuit composed of the first NMOS transistor M1, the second NMOS transistor M2, the first capacitor C1, and the second capacitor C2: the drain of the cross-coupled pair composed of two identical NMOS transistors is connected to the power supply voltage, and the source The poles are respectively connected to the upper plates of the first capacitor C1 and the second capacitor C2, and the lower plates of the first capacitor C1 and the second capacitor C2 are respectively connected to the two-phase non-overlapping clock φ 1B , φ 1 , the upper plate of the first capacitor C1 is connected to the source terminal of the first NMOS transis...

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Abstract

The invention relates to a high-precision sampling switch adopting a grate source tracking technology, belonging to the sampling switch adopting the grate source tracking technology, particularly to a method for designing the high-precision sampling switch adopting the grate source tracking technology and used for a sampling holding circuit and a switching circuit of the high-precision sampling switch. Due to the additional arrangement of a driving circuit, the direct driving of capacitance in a gate voltage conduction switching circuit by the operational amplification of an SHA is avoided, thereby the voltage at a gate end and a source end of the high-precision sampling switch is improved through improving the values of stored voltage and capacitance, the conduction resistance of an MOS switch is reduced and the parasitic capacitance of a gate electrode of a sampling switch tube is effectively reduced so that the gate source boosting voltage of the sampling switch tube is improved.

Description

technical field [0001] The invention relates to a sampling switch using gate-source follower technology, in particular to a high-precision gate-source follower sampling switch design method and a switch circuit for a sample-and-hold circuit, belonging to the technical field of switched capacitor circuit design. Background technique [0002] In the sample and hold circuit, the performance of the sampling switch (using MOS tube) determines the sampling accuracy and input bandwidth of the signal. The on-resistance of the MOS tube switch is related to its gate-source voltage. When the input signal changes, the gate-source voltage changes accordingly, and the instability of the on-resistance will cause nonlinear distortion of the signal. In order to overcome the non-linearity of the on-resistance of the MOS switch, a gate-source follower (Bootstrap) structure is often used. but in figure 1 In a conventional gate-source follower switch, when the charge stored on capacitor C3 cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/687
Inventor 龙善丽吴建辉汤黎明袁渊朱贾峰曲子华张萌李红茆邦琴
Owner JIANGSU JINSHENGYUAN SPECIAL VALVE
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