公开(公告)号：US20250147078A1

公开(公告)日：2025-05-08

申请号：US18590241

申请日：2024-02-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Hemant SHUKLA ,  Sven SOELL ,  Paul WILSON ,  Deep SAXENA ,  Beata K. KUBIAK ,  Ross C. MORGAN ,  Malcolm BLYTH ,  Angus BLACK

IPC: G01R19/10 ,  G01R15/14 ,  G01R19/25

Abstract: A current sensing system for sensing current through first and second circuit elements of a circuit in which the first and second circuit elements are active in respective first and second phases of an operational cycle of the circuit, the current sensing system comprising: first current sensing circuitry for sensing a current through the first circuit element; second current sensing circuitry for sensing a current through the second circuit element; and summation circuitry coupled to an output of the first current sensing circuitry and an output of the second current sensing circuitry, wherein the summation circuitry is configured to output a summation signal indicative of a sum of the sensed current through the first circuit element and the sensed current through the second circuit element so as to provide an indication of a total current drawn over an operational cycle of the circuit.

公开(公告)号：US20220385252A1

公开(公告)日：2022-12-01

申请号：US17586111

申请日：2022-01-27

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Sven SOELL ,  Paul WILSON ,  James T. DEAS ,  Axel THOMSEN

IPC: H03F3/45 ,  H03M1/66

Abstract: A circuit may include a two-stage feedforward compensated operational transconductance integrated amplifier, and the two-stage feedforward compensated operational transconductance integrated amplifier may include an input terminal, an output terminal, a signal path between the input terminal and the output terminal, the signal path comprising a first signal path gain stage and a second signal path gain stage, and ripple rejection circuitry coupled between the input terminal and an intermediate node of the signal path located between the first signal path gain stage and the second signal path gain stage. The ripple rejection circuitry may include a first ripple rejection circuitry gain stage coupled at its input to the input terminal and coupled at its output to an input terminal of a chopper circuit, a notch filter coupled at its input to an output terminal of the chopper circuit, and a second ripple rejection circuitry gain stage coupled at its input to an output terminal of the notch filter and coupled at its output to the intermediate node.

公开(公告)号：US20250147081A1

公开(公告)日：2025-05-08

申请号：US18590262

申请日：2024-02-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Hemant SHUKLA ,  Sven SOELL

IPC: G01R19/18 ,  G01R19/25

Abstract: A differential sensing system for sensing a current through a circuit element of a circuit, the differential sensing system comprising: a first current sense path having an input for coupling to a first node of the circuit element, the first current sense path comprising a first plurality of replica devices; a second current sense path having an input for coupling to a second node of the circuit element, the second current sense path comprising a second plurality of replica devices, wherein the second plurality is equal to the first plurality; a first cross-coupling switch operable to couple the input of the first current sense path to the second plurality of replica devices; a second cross-coupling switch operable to couple the input of the second current sense path to the first plurality of replica devices; differential amplifier circuitry having first and second inputs, wherein the differential amplifier circuitry is configured to output a differential replica current pair indicative of the current through the circuit element; and a controller, wherein the differential sensing system is operable in a chopping mode to perform a chopping operation in which: the first cross-coupling switch and a replica device of the first current sense path are controlled by the controller to couple the first input of the differential amplifier circuitry to the input of the first current sense path in a first phase of a chopping operation and to the input of the second current sense path in a subsequent phase of the chopping operation; and the second cross-coupling switch and a replica device of the second current sense path are controlled by the controller to couple the second input of the differential amplifier circuitry to the input of the second current sense path in the first phase of the chopping operation and to the input of the first current sense path in the subsequent phase of the chopping operation.