WO2023137790A1 - High-linearity bootstrapped switch circuit for sensor, and control method therefor - Google Patents

High-linearity bootstrapped switch circuit for sensor, and control method therefor Download PDF

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WO2023137790A1
WO2023137790A1 PCT/CN2022/074484 CN2022074484W WO2023137790A1 WO 2023137790 A1 WO2023137790 A1 WO 2023137790A1 CN 2022074484 W CN2022074484 W CN 2022074484W WO 2023137790 A1 WO2023137790 A1 WO 2023137790A1
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switch
bootstrap
switches
linearity
turned
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PCT/CN2022/074484
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French (fr)
Chinese (zh)
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魏榕山
魏聪
郑智建
林金晖
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福州大学
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Priority claimed from CN202210076592.XA external-priority patent/CN114421945B/en
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Publication of WO2023137790A1 publication Critical patent/WO2023137790A1/en

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor

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  • the invention relates to the field of intelligent sensor design, in particular to a high linearity bootstrap switch circuit for sensors and a control method thereof.
  • the modern smart sensor system converts natural signals such as temperature, humidity, pressure and magnetic force through the front end of the sensor into analog signals, and then converts them into digital signals through the signal conditioning chip for processing by the back-end microprocessor.
  • signal conditioning chips are required to meet low offset, low noise and high linearity.
  • the sampling switch discretizes the analog signal sampling for processing by subsequent circuits, so the performance of the sampling switch directly affects the performance of the entire sensor.
  • the sampling switch circuit in order to improve the linearity, some researchers have proposed a gate voltage bootstrap sampling switch; however, due to the improvement of the process, the influence of parasitic capacitance on the linearity of the gate voltage bootstrap switch is becoming more and more significant, so designing a sampling switch with high linearity is also a key to sensor design.
  • the object of the present invention is to provide a high-linearity bootstrap switch circuit for sensors and a control method thereof, so as to greatly improve the linearity of the bootstrap switch.
  • the present invention adopts the following technical solutions:
  • a high-linearity bootstrap switch circuit for sensors composed of transistor M1 and nine switches S1, S2, S3, S4, S5, S6, S7, S8, S9, bootstrap capacitor C1 and compensation capacitor Cc;
  • the upper end of the switch S1 is connected to the power supply voltage VDD
  • the lower end of the switch S1 is connected to the upper plate of the bootstrap capacitor C1 and the left end of the switch S2 is connected to form a node A
  • the right end of the switch S3 is connected with the ground potential to form node B
  • the lower end of the switch S4 is connected with the ground potential
  • the right end of the switch S5, the source of the transistor M1, and the left end of the switch S7 are connected with the input signal VIN
  • the drain of the transistor M1 is connected with the output terminal VOUT of the bootstrap switch
  • the right end of the switch S7 and the lower end of the switch S6 are connected with the upper end
  • a control method for a high linearity bootstrap switching circuit for a sensor comprising:
  • the high-linearity bootstrap switch When the clock signal CLK is at a high level, the high-linearity bootstrap switch is in the sampling state; the transistor M1 is turned on, the switches S2, S5, S6, and S9 are turned on, and the switches S1, S3, S4, S7, and S8 are turned off; the output voltage VOUT of the bootstrap switch follows the change of the input voltage VIN to complete the sampling process;
  • the high linearity bootstrap switch When the clock signal CLK is at a low level, the high linearity bootstrap switch is in a holding state; the transistor M1 is turned off, the switches S2, S5, S6, and S9 are turned off, and the switches S1, S3, S4, S7, and S8 are turned on; the upper plate of the bootstrap capacitor C1 is charged to the power supply potential, the lower plate of the bootstrap capacitor C1 is discharged to the ground potential, the upper plate of the compensation capacitor Cc is followed by the change of the input signal VIN, and the lower plate of the compensation capacitor Cc is discharged to the ground potential; the output signal VOUT maintains the previous moment Sampling end voltage.
  • the present invention has the following beneficial effects:
  • the present invention adds switches S7, S8, S9 and nonlinear compensation capacitor Cc, which compensates the input-related nonlinear term introduced by the parasitic capacitance at nodes A and B, thereby greatly improving the linearity of the bootstrap switch.
  • switches S7, S8, S9 and nonlinear compensation capacitor Cc which compensates the input-related nonlinear term introduced by the parasitic capacitance at nodes A and B, thereby greatly improving the linearity of the bootstrap switch.
  • the application prospect is very broad.
  • Fig. 1 is the overall circuit diagram of the present invention.
  • the present invention provides a kind of high linearity bootstrap switch circuit for sensor, is made up of transistor M1 and nine switches S1, S2, S3, S4, S5, S6, S7, S8, S9, bootstrap capacitor C1 and compensation capacitor Cc;
  • the right end of the switch S3 is connected to the ground potential to form a node B;
  • the lower end of the switch S4 is connected to the ground potential;
  • the right end of the switch S5, the source of the transistor M1, and the left end of the switch S7 are connected to the input signal VIN;
  • the drain of the transistor M1 is connected to the output terminal VOUT of the bootstrap switch;
  • the right end of the switch S7 and the lower end of the switch S6 are connected to the upper end of the compensation capacitor Cc;
  • the upper end of the switch S9 is connected to the lower plate of the compensation capacitor Cc;
  • the lower end of the switch S8 is connected to the ground potential;
  • the lower end of the switch S9 is connected to the power supply potential; the on and off of the
  • a control method for a high-linearity bootstrap switch circuit for a sensor including two states, a sampling state and a holding state number.
  • CLK When CLK is at a high level, the high-linearity bootstrap switch is in a sampling state, and the circuit samples an input signal.
  • CLK When the clock signal CLK is at a low level, the high linearity bootstrap switch is in a holding state, and the output waveform of the temporal circuit maintains the sampling voltage at the previous moment, specifically:
  • the high-linearity bootstrap switch When the clock signal CLK is at a high level, the high-linearity bootstrap switch is in the sampling state; the transistor M1 is turned on, the switches S2, S5, S6, and S9 are turned on, and the switches S1, S3, S4, S7, and S8 are turned off; the output voltage VOUT of the bootstrap switch follows the change of the input voltage VIN to complete the sampling process;
  • the high linearity bootstrap switch When the clock signal CLK is at a low level, the high linearity bootstrap switch is in a holding state; the transistor M1 is turned off, the switches S2, S5, S6, and S9 are turned off, and the switches S1, S3, S4, S7, and S8 are turned on; the upper plate of the bootstrap capacitor C1 is charged to the power supply potential, the lower plate of the bootstrap capacitor C1 is discharged to the ground potential, the upper plate of the compensation capacitor Cc is followed by the change of the input signal VIN, and the lower plate of the compensation capacitor Cc is discharged to the ground potential; the output signal VOUT maintains the previous moment Sampling end voltage.

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Abstract

A high-linearity bootstrapped switch circuit for a sensor, comprising a transistor M1, nine switches S1, S2, S3, S4, S5, S6, S7, S8, and S9, a bootstrap capacitor C1, and a compensation capacitor Cc; the circuit comprises two working stages, i.e., a sampling stage and a holding stage. Compared with a traditional bootstrapped switch circuit, the switches S7, S8, and S9 and the non-linear compensation capacitor are added to the circuit, so that input-related non-linear terms introduced by parasitic capacitance at nodes A and B are compensated, thereby greatly improving the linearity of bootstrapped switches.

Description

一种用于传感器的高线性度自举开关电路及其控制方法A high linearity bootstrap switch circuit for sensor and its control method 技术领域technical field
本发明涉及智能传感器设计领域，具体涉及一种用于传感器的高线性度自举开关电路及其控制方法。The invention relates to the field of intelligent sensor design, in particular to a high linearity bootstrap switch circuit for sensors and a control method thereof.
背景技术Background technique
现代智能传感器系统通过传感器前端感知温度、湿度、压力磁力等自然信号转换为模拟信号，经过信号调理芯片转换为数字信号交由后端微处理器处理，应用领域涵盖可穿戴设备、VR应用、无人机、车联网、自动驾驶和工业应用等。在大部分传感器系统中，都要求信号调理芯片需要满足低失调、低噪声和高的线性度。The modern smart sensor system converts natural signals such as temperature, humidity, pressure and magnetic force through the front end of the sensor into analog signals, and then converts them into digital signals through the signal conditioning chip for processing by the back-end microprocessor. In most sensor systems, signal conditioning chips are required to meet low offset, low noise and high linearity.
技术问题technical problem
采样开关作为传感器信号调理电路中最重要的模块之一，将模拟信号采样离散化，供后续电路进行处理，因此采样开关的性能直接影响到整个传感器的性能。在采样开关电路中，为了提高线性度，已经有研究人员提出了栅压自举采样开关；但是由于工艺制程的提高，寄生电容对栅压自举开关线性度的影响越来越显著，所以设计一个高线性度的采样开关也是传感器设计的一个关键。As one of the most important modules in the sensor signal conditioning circuit, the sampling switch discretizes the analog signal sampling for processing by subsequent circuits, so the performance of the sampling switch directly affects the performance of the entire sensor. In the sampling switch circuit, in order to improve the linearity, some researchers have proposed a gate voltage bootstrap sampling switch; however, due to the improvement of the process, the influence of parasitic capacitance on the linearity of the gate voltage bootstrap switch is becoming more and more significant, so designing a sampling switch with high linearity is also a key to sensor design.
技术解决方案technical solution
有鉴于此，本发明的目的在于提供一种用于传感器的高线性度自举开关电路及其控制方法，实现大幅度提高自举开关的线性度。In view of this, the object of the present invention is to provide a high-linearity bootstrap switch circuit for sensors and a control method thereof, so as to greatly improve the linearity of the bootstrap switch.
为实现上述目的，本发明采用如下技术方案：To achieve the above object, the present invention adopts the following technical solutions:
一种用于传感器的高线性度自举开关电路，由晶体管M1和九个开关S1，S2，S3，S4，S5，S6，S7，S8，S9、自举电容C1以及补偿电容Cc组成；所述开关S1的上端连接电源电压VDD，开关S1的下端连接自举电容C1的上极板与开关S2的左端相连接形成节点A；所述开关S2的右端、开关S3的左端、晶体管M1的栅极与开关S6的上端相连；所述开关S3的右端与地电位相连接，形成节点B；开关S4的下端与地电位相连接；所述开关S5的右端、晶体管M1的源极、开关S7的左端与输入信号VIN相连接；所述晶体管M1的漏极与自举开关的输出端 VOUT相连接；所述开关S7的右端、开关S6的下端与补偿电容Cc的上端相连接；所述开关S8的上端、开关S9的上端与补偿电容Cc的下极板相连接；所述开关S8的下端连接至地电位；所述开关S9的下端连接至电源电位。A high-linearity bootstrap switch circuit for sensors, composed of transistor M1 and nine switches S1, S2, S3, S4, S5, S6, S7, S8, S9, bootstrap capacitor C1 and compensation capacitor Cc; the upper end of the switch S1 is connected to the power supply voltage VDD, the lower end of the switch S1 is connected to the upper plate of the bootstrap capacitor C1 and the left end of the switch S2 is connected to form a node A; the right end of the switch S2, the left end of the switch S3, and the gate of the transistor M1 The right end of the switch S3 is connected with the ground potential to form node B; the lower end of the switch S4 is connected with the ground potential; the right end of the switch S5, the source of the transistor M1, and the left end of the switch S7 are connected with the input signal VIN; the drain of the transistor M1 is connected with the output terminal VOUT of the bootstrap switch; the right end of the switch S7 and the lower end of the switch S6 are connected with the upper end of the compensation capacitor Cc; The upper end is connected to the lower plate of the compensation capacitor Cc; the lower end of the switch S8 is connected to the ground potential; the lower end of the switch S9 is connected to the power supply potential.
进一步的，所述9个开关的导通和关断通过时钟信号CLK控制。Further, the turn-on and turn-off of the nine switches are controlled by the clock signal CLK.
一种用于传感器的高线性度自举开关电路的控制方法，包括：A control method for a high linearity bootstrap switching circuit for a sensor, comprising:
当时钟信号CLK为高电平，该高线性度自举开关处于采样状态；晶体管M1导通，开关S2，S5，S6，S9导通，开关S1，S3，S4，S7，S8断开；自举开关的输出端电压VOUT跟随输入端电压VIN变化，完成采样过程；When the clock signal CLK is at a high level, the high-linearity bootstrap switch is in the sampling state; the transistor M1 is turned on, the switches S2, S5, S6, and S9 are turned on, and the switches S1, S3, S4, S7, and S8 are turned off; the output voltage VOUT of the bootstrap switch follows the change of the input voltage VIN to complete the sampling process;
当时钟信号CLK为低电平，该高线性度自举开关处于保持状态；晶体管M1截止，开关S2，S5，S6，S9断开，开关S1，S3，S4，S7，S8导通；自举电容C1上极板被充电至电源电位，自举电容C1下极板被放电至地电位，补偿电容Cc上极板被跟随跟随输入信号VIN变化，补偿电容Cc下极板被放电至地电位；输出信号VOUT保持上一时刻采样结束电压。When the clock signal CLK is at a low level, the high linearity bootstrap switch is in a holding state; the transistor M1 is turned off, the switches S2, S5, S6, and S9 are turned off, and the switches S1, S3, S4, S7, and S8 are turned on; the upper plate of the bootstrap capacitor C1 is charged to the power supply potential, the lower plate of the bootstrap capacitor C1 is discharged to the ground potential, the upper plate of the compensation capacitor Cc is followed by the change of the input signal VIN, and the lower plate of the compensation capacitor Cc is discharged to the ground potential; the output signal VOUT maintains the previous moment Sampling end voltage.
有益效果Beneficial effect
本发明与现有技术相比具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
本发明相比于传统自己开关电路，加入了开关S7，S8，S9和非线性补偿电容Cc，补偿了由于节点A和节点B处寄生电容引入的和输入相关的非线性项，从而大幅度提高自举开关的线性度，在高精度、高线性度要求的传感器中，应用前景十分广阔。Compared with the traditional self-switching circuit, the present invention adds switches S7, S8, S9 and nonlinear compensation capacitor Cc, which compensates the input-related nonlinear term introduced by the parasitic capacitance at nodes A and B, thereby greatly improving the linearity of the bootstrap switch. In sensors requiring high precision and high linearity, the application prospect is very broad.
附图说明Description of drawings
图1是本发明整体电路图。Fig. 1 is the overall circuit diagram of the present invention.
本发明的实施方式Embodiments of the present invention
下面结合附图及实施例对本发明做进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
请参照图1，本发明提供一种用于传感器的高线性度自举开关电路，由晶体管M1和九个开关S1，S2，S3，S4，S5，S6，S7，S8，S9、自举电容C1以及补偿电容Cc组成；所述开关S1的上端连接电源电压VDD，开关S1的下端连接自举电容C1的上极板与开关S2的左端相连接形成节点A；所述开关S2的右端、开关S3的左端、晶体管M1的栅极与开关S6的上端相连；所述开关S3的右端与地电位相连接，形成节点B；开关S4的下端与地电位相连接；所述开关S5的右 端、晶体管M1的源极、开关S7的左端与输入信号VIN相连接；所述晶体管M1的漏极与自举开关的输出端VOUT相连接；所述开关S7的右端、开关S6的下端与补偿电容Cc的上端相连接；所述开关S8的上端、开关S9的上端与补偿电容Cc的下极板相连接；所述开关S8的下端连接至地电位；所述开关S9的下端连接至电源电位；9个开关的导通和关断通过时钟信号CLK控制。Please refer to Fig. 1, the present invention provides a kind of high linearity bootstrap switch circuit for sensor, is made up of transistor M1 and nine switches S1, S2, S3, S4, S5, S6, S7, S8, S9, bootstrap capacitor C1 and compensation capacitor Cc; The right end of the switch S3 is connected to the ground potential to form a node B; the lower end of the switch S4 is connected to the ground potential; the right end of the switch S5, the source of the transistor M1, and the left end of the switch S7 are connected to the input signal VIN; the drain of the transistor M1 is connected to the output terminal VOUT of the bootstrap switch; the right end of the switch S7 and the lower end of the switch S6 are connected to the upper end of the compensation capacitor Cc; The upper end of the switch S9 is connected to the lower plate of the compensation capacitor Cc; the lower end of the switch S8 is connected to the ground potential; the lower end of the switch S9 is connected to the power supply potential; the on and off of the nine switches are controlled by the clock signal CLK.
一种用于传感器的高线性度自举开关电路的控制方法，包括两种状态，采样状态和保持状态号，当CLK为高电平时，该高线性度自举开关处于采样状态，电路对输入信号进行采样。当时钟信号CLK为低电平，该高线性度自举开关处于保持状态，该时态电路输出波形保持上一时刻采样电压，具体为:A control method for a high-linearity bootstrap switch circuit for a sensor, including two states, a sampling state and a holding state number. When CLK is at a high level, the high-linearity bootstrap switch is in a sampling state, and the circuit samples an input signal. When the clock signal CLK is at a low level, the high linearity bootstrap switch is in a holding state, and the output waveform of the temporal circuit maintains the sampling voltage at the previous moment, specifically:
当时钟信号CLK为高电平，该高线性度自举开关处于采样状态；晶体管M1导通，开关S2，S5，S6，S9导通，开关S1，S3，S4，S7，S8断开；自举开关的输出端电压VOUT跟随输入端电压VIN变化，完成采样过程；When the clock signal CLK is at a high level, the high-linearity bootstrap switch is in the sampling state; the transistor M1 is turned on, the switches S2, S5, S6, and S9 are turned on, and the switches S1, S3, S4, S7, and S8 are turned off; the output voltage VOUT of the bootstrap switch follows the change of the input voltage VIN to complete the sampling process;
当时钟信号CLK为低电平，该高线性度自举开关处于保持状态；晶体管M1截止，开关S2，S5，S6，S9断开，开关S1，S3，S4，S7，S8导通；自举电容C1上极板被充电至电源电位，自举电容C1下极板被放电至地电位，补偿电容Cc上极板被跟随跟随输入信号VIN变化，补偿电容Cc下极板被放电至地电位；输出信号VOUT保持上一时刻采样结束电压。When the clock signal CLK is at a low level, the high linearity bootstrap switch is in a holding state; the transistor M1 is turned off, the switches S2, S5, S6, and S9 are turned off, and the switches S1, S3, S4, S7, and S8 are turned on; the upper plate of the bootstrap capacitor C1 is charged to the power supply potential, the lower plate of the bootstrap capacitor C1 is discharged to the ground potential, the upper plate of the compensation capacitor Cc is followed by the change of the input signal VIN, and the lower plate of the compensation capacitor Cc is discharged to the ground potential; the output signal VOUT maintains the previous moment Sampling end voltage.
以上所述仅为本发明的较佳实施例，凡依本发明申请专利范围所做的均等变化与修饰，皆应属本发明的涵盖范围。The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (3)

  1. 一种用于传感器的高线性度自举开关电路，其特征在于，包括晶体管M1、九个开关S1，S2，S3，S4，S5，S6，S7，S8，S9、自举电容C1以及补偿电容Cc；所述开关S1的上端连接电源电压VDD，开关S1的下端连接自举电容C1的上极板与开关S2的左端相连接形成节点A；所述开关S2的右端、开关S3的左端、晶体管M1的栅极与开关S6的上端相连；所述开关S3的右端与地电位相连接，形成节点B；开关S4的下端与地电位相连接；所述开关S5的右端、晶体管M1的源极、开关S7的左端与输入信号VIN相连接；所述晶体管M1的漏极与自举开关的输出端VOUT相连接；所述开关S7的右端、开关S6的下端与补偿电容Cc的上端相连接；所述开关S8的上端、开关S9的上端与补偿电容Cc的下极板相连接；所述开关S8的下端连接至地电位；所述开关S9的下端连接至电源电位。A kind of high linearity bootstrap switch circuit for sensor, it is characterized in that, comprises transistor M1, nine switches S1, S2, S3, S4, S5, S6, S7, S8, S9, bootstrap capacitor C1 and compensation capacitor Cc; The gate of 1 is connected to the upper end of the switch S6; the right end of the switch S3 is connected to the ground potential to form node B; the lower end of the switch S4 is connected to the ground potential; the right end of the switch S5, the source of the transistor M1, and the left end of the switch S7 are connected to the input signal VIN; the drain of the transistor M1 is connected to the output terminal VOUT of the bootstrap switch; The upper end of S9 is connected to the lower plate of the compensation capacitor Cc; the lower end of the switch S8 is connected to the ground potential; the lower end of the switch S9 is connected to the power supply potential.
  2. 根据权利要求1所述的一种用于传感器的高线性度自举开关电路，其特征在于，所述9个开关的导通和关断通过时钟信号CLK控制。A high-linearity bootstrap switch circuit for sensors according to claim 1, wherein the on and off of the nine switches are controlled by a clock signal CLK.
  3. 根据权利要求1所述的一种用于传感器的高线性度自举开关电路的控制方法，其特征在于，包括：A control method for a high linearity bootstrap switch circuit for sensors according to claim 1, characterized in that it comprises:
    当时钟信号CLK为高电平，该高线性度自举开关处于采样状态；晶体管M1导通，开关S2，S5，S6，S9导通，开关S1，S3，S4，S7，S8断开；自举开关的输出端电压VOUT跟随输入端电压VIN变化，完成采样过程；When the clock signal CLK is at a high level, the high-linearity bootstrap switch is in the sampling state; the transistor M1 is turned on, the switches S2, S5, S6, and S9 are turned on, and the switches S1, S3, S4, S7, and S8 are turned off; the output voltage VOUT of the bootstrap switch follows the change of the input voltage VIN to complete the sampling process;
    当时钟信号CLK为低电平，该高线性度自举开关处于保持状态；晶体管M1截止，开关S2，S5，S6，S9断开，开关S1，S3，S4，S7，S8导通；自举电容C1上极板被充电至电源电位，自举电容C1下极板被放电至地电位，补偿电容Cc上极板被跟随跟随输入信号VIN变化，补偿电容Cc下极板被放电至地电位；输出信号VOUT保持上一时刻采样结束电压。When the clock signal CLK is at a low level, the high linearity bootstrap switch is in a holding state; the transistor M1 is turned off, the switches S2, S5, S6, and S9 are turned off, and the switches S1, S3, S4, S7, and S8 are turned on; the upper plate of the bootstrap capacitor C1 is charged to the power supply potential, the lower plate of the bootstrap capacitor C1 is discharged to the ground potential, the upper plate of the compensation capacitor Cc is followed by the change of the input signal VIN, and the lower plate of the compensation capacitor Cc is discharged to the ground potential; the output signal VOUT maintains the previous moment Sampling end voltage.
PCT/CN2022/074484 2022-01-24 2022-01-28 High-linearity bootstrapped switch circuit for sensor, and control method therefor WO2023137790A1 (en)

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US20200169168A1 (en) * 2018-11-26 2020-05-28 Texas Instruments Incorporated Multi-capacitor bootstrap circuit
CN111970004A (en) * 2020-08-12 2020-11-20 北京中电华大电子设计有限责任公司 Bootstrap switch structure without influencing service life of device
CN112383292A (en) * 2020-12-18 2021-02-19 福州大学 High-speed high-linearity grid voltage bootstrap switch circuit
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CN201887738U (en) * 2010-10-09 2011-06-29 中国电子科技集团公司第五十八研究所 High-linearity-degree CMOS bootstrap sampling switch
CN104113316A (en) * 2014-05-12 2014-10-22 西安电子科技大学 CMOS bootstrapped switch circuit
CN107370487A (en) * 2017-07-18 2017-11-21 中国电子科技集团公司第二十四研究所 A kind of boot-strapped switch circuit based on NMOS tube
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