公开(公告)号：US10574253B1

公开(公告)日：2020-02-25

申请号：US16358512

申请日：2019-03-19

Applicant: Renesas Electronics America Inc.

Inventor： Travis Guthrie ,  Narendra Kayathi

IPC: H03M1/12 ,  G01R15/18 ,  G01R19/25

Abstract: According to certain aspects, the present embodiments provide a solution for sampling and converting an analog signal at high frequencies but with low power consumption. In some embodiments, a low power, low resolution, AC coupled ADC is used to track the high frequency component of the analog input signal, in parallel with a high resolution ADC to sense the DC signal at a significantly lower sample rate. According to some aspects, the AC coupled ADC requires no reference or a low resolution reference. In these and other embodiments, a plurality of low resolution, low power ADCs having a high sampling rate may be time multiplexed together with a precision ADC at a low sampling rate.

公开(公告)号：US11002771B2

公开(公告)日：2021-05-11

申请号：US16357220

申请日：2019-03-18

Applicant: RENESAS ELECTRONICS AMERICA INC.

Inventor： Travis Guthrie ,  Narendra Kayathi

IPC: G01R19/257 ,  H03F3/217 ,  G01R19/00 ,  H03K7/08 ,  G01R19/25 ,  H02M3/157 ,  H03M1/50

Abstract: In one or more embodiments, an efficient scheme is provided for sampling inductor currents in a digital multiphase PWM controller used for high-bandwidth voltage regulation. Some embodiments use the data from the PWM modulator along with weighted states based on the PWM waveform and past conversions in order to prioritize which current sense input should be sampled for each conversion. In these and other embodiments, a single ADC is used to sample inductor currents from two or more phases in a multiphase PWM controller, thereby providing power and area savings, for example.

公开(公告)号：US11067611B2

公开(公告)日：2021-07-20

申请号：US16357212

申请日：2019-03-18

Applicant: RENESAS ELECTRONICS AMERICA INC.

Inventor： Travis Guthrie ,  Narendra Kayathi

IPC: G01R19/257 ,  H03F3/217 ,  G01R19/00 ,  H02M3/157 ,  G01R19/25

Abstract: According to certain aspects, a predictive tracking scheme is provided for sampling inductor currents in a digital PWM controller used for high-bandwidth voltage regulation. In one or more embodiments, the predicted current derived from the PWM waveform is fed forward to the current sense ADC in order to reduce the required conversion range. These and other embodiments only need to convert a few of the LSB of the ADC in order to correct the largest error expected in the synthesizer.