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。