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：US20240322821A1

公开(公告)日：2024-09-26

申请号：US18188067

申请日：2023-03-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ross C. MORGAN ,  Joe WALKER ,  Yongjie CHENG ,  Lingli ZHANG

IPC: H03K17/693 ,  H03K3/017 ,  H03K17/687

CPC classification number: H03K17/693 ,  H03K3/017 ,  H03K17/6871

Abstract: This application relates to methods and apparatus for multichannel drivers for driving transducers in different channels. A multichannel driver has a plurality of output stages configured such that two output nodes can be modulated between selected switching voltages with a controlled duty cycle to generate a differential output signal across a respective transducer, each output stage being operable with different switching voltages in different modes of operation. A first set of two or more of the output stages are arranged to receive a voltage output by a capacitive voltage generator to use as a switching voltage. A controller is configured to control the mode of operation and duty-cycle of each of the output stages based on a respective input signal and also based on operation of the other output stages of the first set.

公开(公告)号：US20240283237A1

公开(公告)日：2024-08-22

申请号：US18413633

申请日：2024-01-16

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Michael ROBINSON ,  Ross C. MORGAN ,  Graham G. MACKAY ,  Neil WHYTE

IPC: H02H3/24 ,  G01R31/327 ,  G01R31/64 ,  H03K17/687

CPC classification number: H02H3/24 ,  H03K17/6871 ,  G01R31/3277 ,  G01R31/64

Abstract: An integrated circuit (IC) comprising: control circuitry operable to control: an external switch of a primary current path for an energy storage component of a circuit, wherein the external switch of the primary current path is external to the IC; a first internal switch of a secondary current path for the energy storage element, wherein the first internal switch is internal to the IC, wherein the IC is operable in: a first mode in which the first internal switch of the secondary current path is actuated to enable the secondary current path; and a second mode in which the external switch of the primary current path is actuated to enable the primary current path.

公开(公告)号：US20230328439A1

公开(公告)日：2023-10-12

申请号：US18188112

申请日：2023-03-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ross C. MORGAN ,  Michael ROBINSON ,  Itisha TYAGI

IPC: H04R5/04 ,  H04R3/12 ,  H04S1/00 ,  H04R5/02

CPC classification number: H04R5/04 ,  H04R3/12 ,  H04R5/02 ,  H04S1/007 ,  H03F3/187

Abstract: An integrated circuit (IC), comprising: a first transducer driver for driving a first transducer; a second transducer driver for driving a second transducer; and boost circuitry comprising first and second boost nodes, the boost converter configurable to boost a supply voltage received at one or more input pins of the IC to provide first and second boosted voltages to respective first and second transducer drivers via respective first and second boost nodes.

公开(公告)号：US20220368325A1

公开(公告)日：2022-11-17

申请号：US17874357

申请日：2022-07-27

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Axel THOMSEN ,  Eric J. KING ,  Thomas H. HOFF ,  John L. MELANSON ,  Angus BLACK ,  Ross C. MORGAN ,  Malcolm BLYTH

IPC: H03K17/687 ,  H02N2/00 ,  H02M3/158

Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A switching driver has first and second supply node for receiving supply voltages and includes an output bridge stage, a capacitor and a network of switches. The network of switches is operable in different switch states to provide different switching voltages to the output bridge stage. A controller is configured to control the switch state of the network of switches and a duty cycle of output switches of the output bridge stage based on an input signal to generate an output signal for driving the transducer.

公开(公告)号：US20220320999A1

公开(公告)日：2022-10-06

申请号：US17220641

申请日：2021-04-01

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Emmanuel MARCHAIS ,  Ross C. MORGAN ,  Ivan PERRY ,  Eric J. KING

IPC: H02M3/04 ,  H02J7/00

Abstract: A power delivery system may include an inductive power converter comprising a shared connection to a shared voltage from a battery, multiple inductive phases, each of the multiple inductive phases configured to generate a respective voltage from the shared voltage, multiple regulated voltage connections, and one or more switches configured and arranged to selectively assign at least one of the multiple inductive phases to a regulated voltage connection selected from the multiple regulated voltage connections.