公开(公告)号：US20200252035A1

公开(公告)日：2020-08-06

申请号：US16736513

申请日：2020-01-07

Applicant: STMicroelectronics S.r.l.

Inventor： Alberto Danioni

IPC: H03F3/16 ,  H03K19/0185 ,  H04R19/04 ,  H04R3/00

Abstract: A charge amplifier circuit is provided. The charge amplifier circuit is couplable to a transducer that generates an electrical charge that varies with an external stimulus. The charge amplifier circuit includes an amplification stage having an input node, couplable to the transducer, and an output node. The amplification stage biases the input node at a first direct current (DC) voltage. The charge amplifier circuit includes a feedback circuit, which includes a feedback capacitor, electrically coupled between the input and output nodes of the amplification stage. The feedback circuit includes a resistor electrically coupled to the input node, and a level-shifter circuit, electrically coupled between the resistor and the output node. The level-shifter circuit biases the output node at a second DC voltage and as a function of a difference between the second DC voltage and a reference voltage.

公开(公告)号：US11824503B2

公开(公告)日：2023-11-21

申请号：US17501699

申请日：2021-10-14

Applicant: STMicroelectronics S.r.l.

Inventor： Alberto Danioni

IPC: H03F3/16 ,  H04R3/00 ,  H03K19/0185 ,  H04R19/04

CPC classification number: H03F3/16 ,  H03K19/018557 ,  H04R3/00 ,  H04R19/04 ,  H04R2201/003

Abstract: A charge amplifier circuit is provided. The charge amplifier circuit is couplable to a transducer that generates an electrical charge that varies with an external stimulus. The charge amplifier circuit includes an amplification stage having an input node, couplable to the transducer, and an output node. The amplification stage biases the input node at a first direct current (DC) voltage. The charge amplifier circuit includes a feedback circuit, which includes a feedback capacitor, electrically coupled between the input and output nodes of the amplification stage. The feedback circuit includes a resistor electrically coupled to the input node, and a level-shifter circuit, electrically coupled between the resistor and the output node. The level-shifter circuit biases the output node at a second DC voltage and as a function of a difference between the second DC voltage and a reference voltage.

公开(公告)号：US11177779B2

公开(公告)日：2021-11-16

申请号：US16736513

申请日：2020-01-07

Applicant: STMicroelectronics S.r.l.

Inventor： Alberto Danioni

IPC: H03F3/16 ,  H04R3/00 ,  H03K19/0185 ,  H04R19/04

Abstract: A charge amplifier circuit is provided. The charge amplifier circuit is couplable to a transducer that generates an electrical charge that varies with an external stimulus. The charge amplifier circuit includes an amplification stage having an input node, couplable to the transducer, and an output node. The amplification stage biases the input node at a first direct current (DC) voltage. The charge amplifier circuit includes a feedback circuit, which includes a feedback capacitor, electrically coupled between the input and output nodes of the amplification stage. The feedback circuit includes a resistor electrically coupled to the input node, and a level-shifter circuit, electrically coupled between the resistor and the output node. The level-shifter circuit biases the output node at a second DC voltage and as a function of a difference between the second DC voltage and a reference voltage.

公开(公告)号：US10965262B2

公开(公告)日：2021-03-30

申请号：US16378872

申请日：2019-04-09

Applicant: STMicroelectronics S.r.l.

Inventor： Alberto Danioni ,  Alessandro Morcelli

IPC: H03F13/00 ,  H03F3/70 ,  H04R19/04

Abstract: In at least one embodiment, an interface electronic circuit for a capacitive acoustic transducer having a sensing capacitor is provided. The interface electronic circuit includes an amplifier, a voltage regulator, a common-mode control circuit, and a reference generator. The amplifier has an input coupled to an electrode of the sensing capacitor. The voltage regulator is configured to receive a regulator reference voltage, generate a regulated voltage based on the regulator reference voltage, and supply the regulated voltage to a supply input of the amplifier. The common-mode control circuit controls a common-mode voltage present on the input of the amplifier based on a common-mode reference voltage. The reference generator receives a supply voltage and generates the regulator reference voltage and the common-mode reference voltage with respective values that are variable as a function of the supply voltage.

公开(公告)号：US20220038065A1

公开(公告)日：2022-02-03

申请号：US17501699

申请日：2021-10-14

Applicant: STMicroelectronics S.r.l.

Inventor： Alberto Danioni

IPC: H03F3/16 ,  H03K19/0185 ,  H04R3/00 ,  H04R19/04

Abstract: A charge amplifier circuit is provided. The charge amplifier circuit is couplable to a transducer that generates an electrical charge that varies with an external stimulus. The charge amplifier circuit includes an amplification stage having an input node, couplable to the transducer, and an output node. The amplification stage biases the input node at a first direct current (DC) voltage. The charge amplifier circuit includes a feedback circuit, which includes a feedback capacitor, electrically coupled between the input and output nodes of the amplification stage. The feedback circuit includes a resistor electrically coupled to the input node, and a level-shifter circuit, electrically coupled between the resistor and the output node. The level-shifter circuit biases the output node at a second DC voltage and as a function of a difference between the second DC voltage and a reference voltage.

公开(公告)号：US09462395B2

公开(公告)日：2016-10-04

申请号：US14746252

申请日：2015-06-22

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Germano Nicollini ,  Andrea Barbieri ,  Federica Barbieri ,  Alberto Danioni ,  Edoardo Marino ,  Sergio Pernici

IPC: H04R3/00 ,  H04R19/04

CPC classification number: H04R19/04 ,  H04R3/00 ,  H04R2201/003

Abstract: A MEMS acoustic transducer device has a capacitive microelectromechanical sensing structure and a biasing circuit. The biasing circuit includes a voltage-boosting circuit that supplies a boosted voltage on an output terminal, and a high-impedance insulating circuit element set between the output terminal and a terminal of the sensing structure, which defines a first high-impedance node associated with the insulating circuit element. The biasing circuit has: a pre-charge stage that generates a first pre-charge voltage on a first output thereof, as a function of, and distinct from, the boosted voltage; and a first switch element set between the first output and the first high-impedance node. The first switch element is operable for selectively connecting the first high-impedance node to the first output, during a phase of start-up of the biasing circuit, for biasing the first high-impedance node to the first pre-charge voltage.

Abstract translation: MEMS声学换能器装置具有电容微机电感测结构和偏置电路。 偏置电路包括在输出端子上提供升压电压的升压电路和设置在感测结构的输出端子和端子之间的高阻抗绝缘电路元件，其限定与第一高阻抗节点相关联的第一高阻抗节点 绝缘电路元件。 偏置电路具有：预充电阶段，其在其第一输出上产生作为升压电压的函数并与其不同的第一预充电电压; 以及设置在第一输出和第一高阻抗节点之间的第一开关元件。 第一开关元件可操作用于在偏置电路的启动阶段期间选​​择性地将第一高阻抗节点连接到第一输出，以将第一高阻抗节点偏置到第一预充电电压。

公开(公告)号：US20160029129A1

公开(公告)日：2016-01-28

申请号：US14746252

申请日：2015-06-22

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Germano Nicollini ,  Andrea Barbieri ,  Federica Barbieri ,  Alberto Danioni ,  Edoardo Marino ,  Sergio Pernici

IPC: H04R19/04

CPC classification number: H04R19/04 ,  H04R3/00 ,  H04R2201/003

Abstract: A MEMS acoustic transducer device has a capacitive microelectromechanical sensing structure and a biasing circuit. The biasing circuit includes a voltage-boosting circuit that supplies a boosted voltage on an output terminal, and a high-impedance insulating circuit element set between the output terminal and a terminal of the sensing structure, which defines a first high-impedance node associated with the insulating circuit element. The biasing circuit has: a pre-charge stage that generates a first pre-charge voltage on a first output thereof, as a function of, and distinct from, the boosted voltage; and a first switch element set between the first output and the first high-impedance node. The first switch element is operable for selectively connecting the first high-impedance node to the first output, during a phase of start-up of the biasing circuit, for biasing the first high-impedance node to the first pre-charge voltage.

Abstract translation: MEMS声学换能器装置具有电容微机电感测结构和偏置电路。 偏置电路包括在输出端子上提供升压电压的升压电路和设置在感测结构的输出端子和端子之间的高阻抗绝缘电路元件，其限定与第一高阻抗节点相关联的第一高阻抗节点 绝缘电路元件。 偏置电路具有：预充电阶段，其在其第一输出上产生作为升压电压的函数并与其不同的第一预充电电压; 以及设置在第一输出和第一高阻抗节点之间的第一开关元件。 第一开关元件可操作用于在偏置电路的启动阶段期间选​​择性地将第一高阻抗节点连接到第一输出，以将第一高阻抗节点偏置到第一预充电电压。