发明授权
- 专利标题: Amplifier with digital input and digital PWM control loop
- 专利标题(中): 具有数字输入和数字PWM控制回路的放大器
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申请号: US12892487申请日: 2010-09-28
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公开(公告)号: US08305246B2公开(公告)日: 2012-11-06
- 发明人: Martin Kinyua , Eric Soenen
- 申请人: Martin Kinyua , Eric Soenen
- 申请人地址: TW
- 专利权人: Taiwan Semiconductor Manufacturing Company, Ltd.
- 当前专利权人: Taiwan Semiconductor Manufacturing Company, Ltd.
- 当前专利权人地址: TW
- 代理机构: Lowe Hauptman Ham & Berner, LLP
- 主分类号: H03M3/02
- IPC分类号: H03M3/02
摘要:
A class D amplifier is configured to accept a digital input signal wherein the control loop of the class D amplifier employs a hybrid filter merged with the front-end of a sigma-delta ADC converter. The term hybrid refers to the filter using both digital and analog components in which the digital delay elements serve as shift registers while the filter coefficients are analog. The filter converts the digital PDM data into a step-wise sinusoidal signal. The sigma-delta ADC receiving a feedback signal subtracts the step-wise sinusoidal signal from the continuous sinusoidal signal and converts the result to a digital PDM signal, without decimation, which passes through a digital filter, a PWM generator, and a pre-driver, to provide power to the load.