公开(公告)号：US11831471B2

公开(公告)日：2023-11-28

申请号：US17841030

申请日：2022-06-15

Applicant: DENSO CORPORATION ,  TOYOTA JIDOSHA KABUSHIKI KAISHA ,  MIRISE Technologies Corporation

Inventor： Shigeki Otsuka ,  Hyoungjun Na ,  Takasuke Ito ,  Yoshikazu Furuta ,  Tomohiro Nezuka

IPC: H04L25/02 ,  H04B3/56

CPC classification number: H04L25/0272 ,  H04B3/56 ,  H04L25/0278

Abstract: A differential communication circuit is connected to a communication line formed of a positive communication line and a negative communication line for differential communication. The differential communication circuit includes: a series circuit that includes a resistor element and a connection switch. The resistor element is connected between the positive and negative communication lines when the connection switch is turned on. The circuit also includes a transmission unit that is configured to output a differential signal to the communication line and a controller that is configured to change impedance of the communication line by turning on the connection switch in a period during which the transmission unit does not output the differential signal.

公开(公告)号：US11181373B2

公开(公告)日：2021-11-23

申请号：US17018209

申请日：2020-09-11

Applicant: DENSO CORPORATION

Inventor： Nobuaki Matsudaira ,  Yoshikazu Furuta ,  Tomohiro Nezuka

IPC: G01C25/00 ,  G01C19/5776

Abstract: A vibration type gyroscope uses a resonator formed of a MEMS. At the time of startup, a lock state determination unit stabilizes an amplitude of a drive signal and outputs a lock signal when the amplitude is stabilized. A phase shifter generates an orthogonal signal by shifting, by 90°, the phase of the drive signal, and a phase compensator outputs a phase signal having a phase corresponding to a control signal based on the orthogonal signal and the in-phase signal of the drive signal. A multiplier multiplies a sense signal and the phase signal outputted from the phase compensator, and a control LPF performs filtering on a multiplication result. A control unit inputs a zero level signal to a PI controller during an initial state, and starts phase control by receiving an output signal of the control LPF, and ends the control when the signal is stabilized around the zero level.

公开(公告)号：US11101816B2

公开(公告)日：2021-08-24

申请号：US17098711

申请日：2020-11-16

Applicant: DENSO CORPORATION

Inventor： Kunihiko Nakamura ,  Tomohiro Nezuka

IPC: H03M3/00 ,  G06G7/186 ,  H03M1/46 ,  H03M1/36

Abstract: An A/D converter includes: a sampler that includes a sampling capacitor and samples an input signal; a D/A converter that selectively outputs an analog voltage; an integrator that integrates an input from the sampler and an input from the D/A converter; Multiple switches that include a first switch independently connecting the sampler to the integrator, a second switch independently connecting the D/A converter to the integrator, a third switch, and, a fourth switch, a quantizer that quantizes an output of the integrator; a control circuit that outputs a digital value based on an output of the quantizer, and a reference potential generation circuit that provides a second reference potential to an integrator side of the sampler through the third switch and provides a first reference potential to the integrator side of the D/A converter through the fourth switch.

公开(公告)号：US11070226B2

公开(公告)日：2021-07-20

申请号：US16937804

申请日：2020-07-24

Applicant: DENSO CORPORATION

Inventor： Kunihiko Nakamura ,  Tomohiro Nezuka ,  Kazutaka Honda

IPC: H03M3/00 ,  H03M1/14

Abstract: An A/D conversion device, which operates in one mode including at least one of a ΔΣ mode, a cyclic mode, and a hybrid mode, includes: a first block that processes an analog input signal by a first amplifier; a second block including a second amplifier; a quantization unit that quantizes one of outputs of the first and second blocks; and a control circuit that switches the mode to perform a control corresponding to the mode.

公开(公告)号：US20190215004A1

公开(公告)日：2019-07-11

申请号：US16224213

申请日：2018-12-18

Applicant: DENSO CORPORATION

Inventor： Tomohiro Nezuka

IPC: H03M3/02 ,  H03F3/45

Abstract: An A/D converter includes an integrator having an operational amplifier, a first feedback capacitor, and a second feedback capacitor, a quantizer outputting a quantization result of an output signal of the operational amplifier, and a D/A converter having a D/A converter capacitor. The D/A converter capacitor has a first terminal connected to an input terminal of the operational amplifier and a second terminal connected to an output terminal of the operational amplifier. The D/A converter performs a subtraction operation by repeating subtraction of charges accumulated in the first and second feedback capacitors based on the quantization result, and performs a cyclic operation by sequentially repeating subtraction and amplification of the charges accumulated in one of the first and second feedback capacitors based on the quantization result.

公开(公告)号：US10158369B2

公开(公告)日：2018-12-18

申请号：US15739206

申请日：2016-07-14

Applicant: DENSO CORPORATION

Inventor： Tomohiro Nezuka

IPC: H03M1/38 ,  H03M1/12 ,  H03M1/54 ,  H03M1/46 ,  H03M1/52 ,  H03M3/00

Abstract: An A/D converter is provided with: an integrator that includes an operational amplifier provided with a first input terminal and an output terminal, and an integration capacitor; a quantizer that outputs a quantization result obtained by quantizing an output signal from the operational amplifier; and a DAC that is connected to the first input terminal and determines DAC voltage. The integrator has a feedback switch between the integration capacitor and the output terminal of the operational amplifier. An analog signal as an input signal is inputted between the integration capacitor and the feedback switch. The integration capacitor samples the analog signal. The quantizer performs the quantization based on the output of the operational amplifier. The DAC sequentially subtracts electric charge accumulated in the integration capacitor to thereby change the analog signal to a digital value.

公开(公告)号：US09281837B2

公开(公告)日：2016-03-08

申请号：US14819767

申请日：2015-08-06

Applicant: DENSO CORPORATION

Inventor： Tomohiro Nezuka

IPC: H03M3/00 ,  H03M1/12 ,  H03M1/00

CPC classification number: H03M3/368 ,  H03M1/00 ,  H03M1/12 ,  H03M3/30 ,  H03M3/43 ,  H03M3/456 ,  H03M3/464

Abstract: An A/D converter includes a delta-sigma processing circuit for A/D conversion by delta-sigma modulation, and a cyclic processing circuit for A/D conversion by cyclic processing of amplification of a residue generated in the A/D conversion. The A/D converter further includes a quantization part for outputting a quantized value of quantized output of the delta-sigma processing circuit and a quantized output of the cyclic processing circuit, and a control circuit for generating an A/D conversion result and switching over a reference voltage based on the quantized value. The delta-sigma processing circuit and the cyclic processing circuit include a sampling capacitor, an integration capacitor and a capacitive D/A converter, which includes a DAC capacitor and add and subtract a charge corresponding to a reference voltage to and from a residue of quantization. The sampling capacitor, the DAC capacitor and the integration capacitor are provided as electrically separate capacitors.

Abstract translation: A / D转换器包括用于通过Δ-Σ调制进行A / D转换的Δ-sigma处理电路和用于通过A / D转换中产生的残余物的放大的循环处理进行A / D转换的循环处理电路。 A / D转换器还包括用于输出Δ-Σ处理电路的量化输出的量化值和循环处理电路的量化输出的量化部分，以及用于产生A / D转换结果和切换的控制电路 基于量化值的参考电压。 Δ-Σ处理电路和循环处理电路包括采样电容器，积分电容器和电容性D / A转换器，其包括DAC电容器，并将与参考电压相对应的电荷加到量化残余物中 。 采样电容器，DAC电容器和积分电容器作为电气分离电容器提供。