公开(公告)号：US09335429B2

公开(公告)日：2016-05-10

申请号：US14636417

申请日：2015-03-03

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Rahul Singh ,  Prashanth Drakshapalli ,  Dale Brummel ,  Stephen T. Hodapp

IPC: H03M3/00 ,  G01V1/18

CPC classification number: G01V1/181 ,  H03M3/424 ,  H03M3/45 ,  H03M3/454

Abstract: A low power analog-to-digital converter configured to sense sensor signals may include a loop filter and a feedback digital-to-analog converter. The loop filter may have a loop filter input configured to receive an input current signal from a sensor and generate an output signal responsive to the input current signal. The feedback digital-to-analog converter may have a feedback output configured to generate a current-mode or charge-mode feedback output signal responsive to the output signal, the feedback output coupled to the loop filter input in order to combine the input current signal and the feedback output signal at the input.

Abstract translation: 被配置为感测传感器信号的低功率模数转换器可以包括环路滤波器和反馈数模转换器。 环路滤波器可以具有环路滤波器输入，其被配置为从传感器接收输入电流信号，并响应于输入电流信号产生输出信号。 反馈数模转换器可以具有被配置为响应于输出信号产生电流模式或电荷模式反馈输出信号的反馈输出，反馈输出耦合到环路滤波器输入，以便组合输入电流信号 和输入端的反馈输出信号。

公开(公告)号：US20150171889A1

公开(公告)日：2015-06-18

申请号：US14636417

申请日：2015-03-03

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Rahul Singh ,  Prashanth Drakshapalli ,  Dale Brummel ,  Stephen T. Hodapp

IPC: H03M3/00 ,  G01V1/18

CPC classification number: G01V1/181 ,  H03M3/424 ,  H03M3/45 ,  H03M3/454

Abstract: A low power analog-to-digital converter configured to sense sensor signals may include a loop filter and a feedback digital-to-analog converter. The loop filter may have a loop filter input configured to receive an input current signal from a sensor and generate an output signal responsive to the input current signal. The feedback digital-to-analog converter may have a feedback output configured to generate a current-mode or charge-mode feedback output signal responsive to the output signal, the feedback output coupled to the loop filter input in order to combine the input current signal and the feedback output signal at the input.

Abstract translation: 被配置为感测传感器信号的低功率模数转换器可以包括环路滤波器和反馈数模转换器。 环路滤波器可以具有环路滤波器输入，其被配置为从传感器接收输入电流信号，并响应于输入电流信号产生输出信号。 反馈数模转换器可以具有被配置为响应于输出信号产生电流模式或电荷模式反馈输出信号的反馈输出，反馈输出耦合到环路滤波器输入，以便组合输入电流信号 和输入端的反馈输出信号。

公开(公告)号：US10401886B1

公开(公告)日：2019-09-03

申请号：US14813549

申请日：2015-07-30

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Rahul Singh ,  Prashanth Drakshappalli ,  Dale Brummel

IPC: G05F1/565 ,  G05F1/46 ,  G05F1/56

Abstract: A system may include a first voltage reference for generating a first voltage for operating a circuit, a second voltage reference having a higher precision than the first voltage reference, and a controller. The controller may be configured to determine a presence or an absence of a condition for calibrating the first voltage reference. The controller may also be configured to, responsive to the presence of the condition, enable the second voltage reference to generate a second voltage for calibrating the first voltage reference. The controller may further be configured to, responsive to the absence of the condition, disable the second voltage reference.

公开(公告)号：US08970413B1

公开(公告)日：2015-03-03

申请号：US13799323

申请日：2013-03-13

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Rahul Singh ,  Prashanth Drakshapalli ,  Dale Brummel

IPC: H03M3/00 ,  H03M1/00

CPC classification number: H03M3/32

Abstract: A low power analog-to-digital converter (ADC) may sense current output of a geophone instead of voltage. The output of the geophone may be terminated through a resistor into a virtual ground of an integrator, which may be located inside a current mode delta-sigma analog-to-digital converter. The integrator may have a current mode or a charge mode feedback. Thus, the geophone may experience constant or substantially constant impedance terminated into a virtual ground. This approach may eliminate an instrumentation amplifier from a geophone sensing circuit, while still allowing for accurate sensing of geophone signals. The instrumentation amplifier is a major current consumer from the signal path, so its elimination may significantly reduce power consumption. The instrumentation amplifier may be eliminated, at least in part because of the provision of the resistance into a virtual ground of an integrator of the delta-sigma ADC.

Abstract translation: 低功耗模数转换器（ADC）可以感测地震检波器的电流输出而不是电压。 地震检波器的输出可以通过电阻器终止到积分器的虚拟地，该积分器可以位于电流模式的Δ-Σ模数转换器内。 积分器可以具有电流模式或充电模式反馈。 因此，地震检波器可能经历恒定或基本恒定的阻抗终止于虚拟地面。 这种方法可以从地震检波器感测电路中消除仪表放大器，同时仍能准确地感测地震检波器信号。 仪表放大器是信号路径的主要消费者，因此其消除可能显着降低功耗。 至少部分地由于向Δ-ΣADC的积分器的虚拟接地提供电阻，可以消除仪表放大器。