公开(公告)号：US20230344388A1

公开(公告)日：2023-10-26

申请号：US18302219

申请日：2023-04-18

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Kemal S. DEMIRCI ,  Tian ZHAO ,  Jeffrey A. MAY ,  Theodore M. BURK ,  Thomas H. HOFF ,  Edward M. VEESER

IPC: H03F1/52 ,  H03F3/183

CPC classification number: H03F1/52 ,  H03F3/183 ,  H03F2200/03 ,  H03F2200/426

Abstract: This application relates to methods and apparatus for power limiting for amplifiers. An amplifier is configured to receive an input supply voltage and to draw, in use, an amplifier input current resulting in an amplifier input power. A power limiter is configured to monitor an indication of the amplifier input power, determine a first signal limit based on said indication of the amplifier input power and a pre-set limit and apply regulation to the input signal to provide a regulated input signal for input to the amplifier that does not exceed the first signal limit.

公开(公告)号：US20240322767A1

公开(公告)日：2024-09-26

申请号：US18188073

申请日：2023-03-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ross C. MORGAN ,  Kemal S. DEMIRCI ,  Thomas H. HOFF

IPC: H03F3/217

CPC classification number: H03F3/2178 ,  H03F2200/03

Abstract: This application relates to methods and apparatus for clipping prevention. A driver apparatus for driving a load with an output signal has a switching driver with a switch network and a modulator configured to control the switch network to switch output nodes between different switching voltages with a controlled duty-cycle. A quantizer controller receives a quantizer input signal based on an input signal and a feedback signal and controls the duty-cycle of the switch network. A clipping prevention controller is configured to control a gain applied to the input signal so as to provide limiting of the input signal to avoid clipping, wherein the clipping prevention controller is configured to dynamically control at least one limiting threshold used to determine when to apply limiting of the input signal based on an indication of said quantizer input signal.

公开(公告)号：US20240323601A1

公开(公告)日：2024-09-26

申请号：US18188085

申请日：2023-03-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ross C. MORGAN ,  Roberto NAPOLI ,  Kemal S. DEMIRCI ,  Thomas H. HOFF

IPC: H04R3/00 ,  H04R29/00

CPC classification number: H04R3/007 ,  H04R29/001 ,  H04R2430/01

Abstract: This application relates to methods and apparatus for clipping prevention. A driver apparatus for driving a transducer has a switching driver configured to switch at least one output node between different switching voltages with a controlled duty-cycle to drive an output signal across the transducer. A clipping prevention controller is configured to control a gain applied to the input signal so as to provide limiting of the input signal to avoid clipping of the output signal. The clipping prevention controller is configured to dynamically control at least one limiting threshold used to determine when to apply limiting of the input signal based on an indication of load resistance of the transducer and the input voltage to the switching driver.