- 专利标题: Direct current mode digital-to-analog converter to class D amplifier
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申请号: US15897177申请日: 2018-02-15
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公开(公告)号: US10158942B2公开(公告)日: 2018-12-18
- 发明人: Lars Risbo , Ryan Erik Lind , Jasjot Singh Chadha
- 申请人: TEXAS INSTRUMENTS INCORPORATED
- 申请人地址: US TX Dallas
- 专利权人: TEXAS INSTRUMENTS INCORPORATED
- 当前专利权人: TEXAS INSTRUMENTS INCORPORATED
- 当前专利权人地址: US TX Dallas
- 代理商 John R. Pessetto; Charles A. Brill; Frank D. Cimino
- 主分类号: H04B15/00
- IPC分类号: H04B15/00 ; H04R3/02 ; H03F3/217 ; H03F3/185 ; H03F3/30 ; H03F3/45 ; H04R3/00
摘要:
A system includes a class D amplifier and a current steering digital-to-analog converter (DAC) directly connected to the class D amplifier. The system also includes a common mode servo circuit coupled to a node interconnecting the current steering DAC to the class D amplifier. The common servo circuit amplifies a difference between a common mode signal determined from the node and a reference voltage and generates a feedback current to the node based on the amplified difference. A feed-forward common-mode compensation circuit is included to reduce an alternating current (AC) ripple from the class D amplifier. The feed-forward common-mode compensation circuit includes first and second resistors coupled to respective outputs of the class D amplifier. A current mirror is coupled to the first and second resistors and is configured to sink a current from the node to ground that approximates a common mode feedback current of the class D amplifier.
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