Invention Grant
- Patent Title: High frequency common mode rejection technique for large dynamic common mode signals
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Application No.: US15193420Application Date: 2016-06-27
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Publication No.: US09960741B2Publication Date: 2018-05-01
- Inventor: Zakaria Mengad , Vladislav Vasilev , Steven Collins
- Applicant: Dialog Semiconductor (UK) Limited
- Applicant Address: GB London
- Assignee: Dialog Semiconductor (UK) Limited
- Current Assignee: Dialog Semiconductor (UK) Limited
- Current Assignee Address: GB London
- Agency: Saile Ackerman LLC
- Agent Stephen B. Ackerman
- Main IPC: H03F3/45
- IPC: H03F3/45 ; H03F3/185 ; H03F3/217
Abstract:
A system is disclosed which allows for canceling high frequency rail to rail common mode swing at pulse-width modulation (PWM) frequency for a Class-D, H and G audio amplifier or a Linear Resonance Actuator (LRA) driver. This allows wide bandwidth current sensing without the need of external components, or large on-chip resistor-capacitor (RC) networks, facilitating integration of the sense resistor. In addition, the sense amplifier DC input common mode and audio band common mode swing is reduced, allowing a sense resistor high frequency common mode swing of a least twice the MOSFET gate break down voltages.
Public/Granted literature
- US20170373655A1 High Frequency Common Mode Rejection Technique for Large Dynamic Common Mode Signals Public/Granted day:2017-12-28
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