公开(公告)号：US20200166606A1

公开(公告)日：2020-05-28

申请号：US16585924

申请日：2019-09-27

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Takashi OSHIMA ,  Tetsuo MATSUI ,  Mitsuya FUKAZAWA ,  Katsuki TATEYAMA ,  Masaki FUJIWARA

IPC: G01S7/35 ,  H03M3/00 ,  G01S13/34

Abstract: A MASH type sigma delta AD converter includes a modulator, an analog filter filtering an extraction signal obtained by extracting a probe signal and an quantization error generated in a quantizer within a sigma delta modulator, a low speed AD converter performing an AD conversion of an output signal of the analog filter, a first adaptive filter searching for a transfer function of the sigma delta modulator, a second adaptive filter searching for a transfer function from an output of the modulator to the low speed AD converter via the analog filter, and a noise cancellation circuit cancelling the probe signal and the quantization error included in an output signal of the quantizer using the search results by the first and second adaptive filters.

公开(公告)号：US20180302102A1

公开(公告)日：2018-10-18

申请号：US15900598

申请日：2018-02-20

Applicant: Renesas Electronics Corporation

Inventor： Takashi OSHIMA ,  Tetsuo MATSUI ,  Mitsuya FUKAZAWA ,  Tomohiko YANO

IPC: H03M3/00 ,  H03H21/00 ,  G01S13/02 ,  G01S7/35

CPC classification number: H03M3/414 ,  G01S7/354 ,  G01S13/0209 ,  H03H21/0012 ,  H03M3/38 ,  H03M3/388 ,  H03M3/458

Abstract: A modulator includes an analog integrator including an analog circuit and a quantizer quantizing its output signal. An external input signal is input thereto. A modulator is coupled to the latter stage of the modulator, and includes a quantizer. A probe signal generation circuit injects a probe signal to the modulator. An adaptive filter searches for a transfer function of the modulator by observing an output signal of the quantizer in accordance with a probe signal. Another adaptive filter searches for a transfer function of the modulator by observing an output signal of the quantizer in accordance with the probe signal. A noise cancel circuit cancels a quantization error generated by the quantizer using search results of the adaptive filters.

公开(公告)号：US20130187628A1

公开(公告)日：2013-07-25

申请号：US13738546

申请日：2013-01-10

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Kenji FURUSAWA ,  Mitsuya FUKAZAWA

IPC: G05F3/16

CPC classification number: G05F3/16 ,  G05F3/30

Abstract: A reference voltage generating circuit with extremely low temperature dependence is provided.The reference voltage generating circuit includes a BGR circuit which generates a bandgap reference voltage; a bandgap current generating circuit which generates a bandgap current according to the bandgap reference voltage; a PTAT current generating circuit which generates a current proportional to the absolute temperature; and a linear approximate correction current generating circuit which compares the current generated by the PTAT current generating circuit and the bandgap current to generate a correction current, and the BGR circuit adds, to the bandgap reference voltage, a correction voltage generated based on the correction current.

公开(公告)号：US20180143229A1

公开(公告)日：2018-05-24

申请号：US15796995

申请日：2017-10-30

Applicant: Renesas Electronics Corporation

Inventor： Makoto SHUTO ,  Kazuyoshi KAWAI ,  Mitsuya FUKAZAWA ,  Robert NOLF ,  Robert DALBY

IPC: G01R21/133 ,  H03G3/20 ,  H03M3/00 ,  H03M1/38 ,  G01R19/252

CPC classification number: G01R21/133 ,  G01R19/252 ,  H03G3/20 ,  H03H17/0621 ,  H03M1/1205 ,  H03M1/38 ,  H03M3/458

Abstract: There is a need for high-order frequency measurement without greatly increasing consumption currents and chip die sizes. A semiconductor device includes: an electric power measuring portion that performs electric power measurement; a high-order frequency measuring portion that performs high-order frequency measurement; and a clock controller that supplies an electric power measuring portion with a first clock signal at a first sampling frequency and supplies a high-order frequency measuring portion with a second clock signal at a second sampling frequency. The second sampling frequency is higher than the first sampling frequency.

公开(公告)号：US20150177770A1

公开(公告)日：2015-06-25

申请号：US14641272

申请日：2015-03-06

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Kenji FURUSAWA ,  Mitsuya FUKAZAWA

IPC: G05F3/16

CPC classification number: G05F3/16 ,  G05F3/30

Abstract: A reference voltage generating circuit with extremely low temperature dependence is provided. The reference voltage generating circuit includes a BGR circuit which generates a bandgap reference voltage; a bandgap current generating circuit which generates a bandgap current according to the bandgap reference voltage; a PTAT current generating circuit which generates a current proportional to the absolute temperature; and a linear approximate correction current generating circuit which compares the current generated by the PTAT current generating circuit and the bandgap current to generate a correction current, and the BGR circuit adds, to the bandgap reference voltage, a correction voltage generated based on the correction current.

Abstract translation: 提供了具有极低温度依赖性的参考电压发生电路。 参考电压产生电路包括产生带隙参考电压的BGR电路; 带隙电流产生电路，其根据带隙基准电压产生带隙电流; 产生与绝对温度成比例的电流的PTAT电流产生电路; 以及线性近似校正电流产生电路，其比较由PTAT电流产生电路产生的电流和带隙电流以产生校正电流，并且BGR电路将基于校正电流产生的校正电压加到带隙基准电压 。