公开(公告)号：US08842031B1

公开(公告)日：2014-09-23

申请号：US13932830

申请日：2013-07-01

Applicant: Cirrus Logic, Inc.

Inventor： Mohammad Ranjbar ,  Bruce Eliot Duewer

IPC: H03M3/00

CPC classification number: H03M3/444

Abstract: The stability of a delta-sigma modulator may be improved by limiting a value within the delta-sigma modulator. For example, the value provided to a quantizer may be limited, by a limiter circuit in the delta-sigma modulator, to a value within a single step range of the quantizer. The limiter circuit may be placed in an inner loop of the delta-sigma modulator to decouple the stability of the inner loop from an outer loop. For example, a delta-sigma modulator may be constructed with an inner loop having a sixth order and an outer loop having a second order, in which the stability of the delta-sigma modulator is proportional to that of a second order.

Abstract translation: 通过限制δ-Σ调制器内的值，可以提高Δ-Σ调制器的稳定性。 例如，提供给量化器的值可以通过Δ-Σ调制器中的限幅器电路限制在量化器的单个步长范围内的值。 限制器电路可以放置在Δ-Σ调制器的内环中，以将内环的稳定性与外环隔离。 例如，Δ-Σ调制器可以被构造成具有具有第六级的内环和具有二阶的外环，其中Δ-Σ调制器的稳定性与第二级的稳定性成比例。

公开(公告)号：US09209762B1

公开(公告)日：2015-12-08

申请号：US14061912

申请日：2013-10-24

Applicant: Cirrus Logic, Inc.

Inventor： Yousof Mortazavi ,  Arash Mashayekhi ,  Mohammad Ranjbar

IPC: H03F3/217 ,  H03F3/185

CPC classification number: H03F3/217 ,  H03F1/305 ,  H03F3/185 ,  H03F3/2171 ,  H03F3/2175

Abstract: In a switched-power amplifier that has controlled power supply rails, e.g., when a volume control is implemented by varying the power supply voltages, a rate-controlled power supply control circuit eliminates audible pops that would otherwise occur when a change in input level causes the power supply rail voltages to change. The control circuit generates control signals that control the regulators providing the power supply rails with a controlled rate of change such that asymmetry between the voltages of the power supply rail outputs during changes of the power supply rails is substantially reduced. The controlled rate of change is less than or equal to the slowest rate of change of the power supply outputs that supply the power supply rails of the switched-power amplifier.

Abstract translation: 在具有受控电源轨的开关功率放大器中，例如，当通过改变电源电压来实现音量控制时，速率控制的电源控制电路消除了当输入电平变化导致的可能出现的声音 电源轨电压发生变化。 所述控制电路产生控制信号，所述控制信号控制所述调节器为所述电源轨提供控制的变化率，使得在所述电源轨的变化期间所述电源轨输出的电压之间的不对称性大大降低。 控制变化率小于或等于提供开关功率放大器的电源轨的电源输出的最慢变化率。