公开(公告)号：US10523227B2

公开(公告)日：2019-12-31

申请号：US16158330

申请日：2018-10-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yasuhide Takase ,  Yasuyuki Matsuya ,  Eri Mizukami ,  Yuji Inagaki ,  Kazuki Mizukami ,  Nozomi Watanabe ,  Riku Yonekawa

IPC: H03M1/12 ,  H03M1/08 ,  H03M3/02 ,  H03M1/20 ,  H03M3/00

Abstract: An A/D converter includes an adder that calculates a difference between an analog input signal and a predicted value, a quantizer that quantizes the difference output from the adder to convert the analog input signal to a digital signal, a prediction filter that generates a predicted value from the digital signal output from the quantizer, and a D/A converter that converts the predicted value from a digital signal to an analog signal and output the predicted value to the adder. The predicted value before being subjected to conversion to the analog signal by the D/A converter defines and functions as an A/D converted output of the analog input signal input to the adder.

公开(公告)号：US11196441B2

公开(公告)日：2021-12-07

申请号：US15979562

申请日：2018-05-15

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yasuhide Takase ,  Yasuyuki Matsuya

IPC: H03M3/00 ,  H03M1/20 ,  H03M1/80 ,  G01D5/24

Abstract: A sensor device includes an A/D converter including an adder that computes a difference between an analog input signal and a predicted value, the adder includes a capacitive adder defined by a series circuit including a capacitive charge output device and a capacitor. A capacitive component in the charge output device defines a portion of the capacitance of the capacitive adder. A digital prediction filter generates the predicted value based on an output from a quantizer. The capacitive adder computes the difference between the analog input signal from the charge output device and the predicted value. The quantizer quantizes and encodes the difference. The A/D converter performs a Δ modulation on the analog input signal which is converted into a digital signal.