公开(公告)号：US11500404B2

公开(公告)日：2022-11-15

申请号：US17140754

申请日：2021-01-04

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John B. Bowlerwell ,  Andrew J. Howlett ,  Graeme S. Angus ,  Andrei Dumitriu

IPC: G05F1/563 ,  G05F1/575 ,  G05F1/62 ,  H03K17/00 ,  H04R3/00

Abstract: The present disclosure relates to circuitry for selecting a bias voltage to output at a bias voltage output node of the circuitry. The circuitry comprises a first circuit node configured to receive a first voltage from a first, unregulated, voltage source and a second circuit node configured to receive a second voltage from a second, regulated, voltage source. A switch arrangement configured to selectively couple the bias voltage output node to the first circuit node or the second circuit node is also provided.

公开(公告)号：US11843354B2

公开(公告)日：2023-12-12

申请号：US17346767

申请日：2021-06-14

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Pradeep Saminathan ,  Graeme S. Angus ,  John B. Bowlerwell

IPC: H03F1/52 ,  H02M1/32 ,  H03F1/56

CPC classification number: H03F1/52 ,  H02M1/32 ,  H03F1/56 ,  H03F2200/03 ,  H03F2200/102 ,  H03F2200/171

Abstract: The present invention relates to circuitry comprising: interpolation filter circuitry configured to receive a digital input signal and to output an interpolated digital signal; amplifier circuitry configured to generate an output signal based on the interpolated digital signal; and protection circuitry. The protection circuitry is configured to activate in response to detection of a fault condition at an output of the amplifier circuitry. The circuitry further comprises first detection circuitry configured to output a control signal to disable the protection circuitry on detection of a transient signal at an output of the interpolation filter circuitry that is unrelated to a fault.