发明名称 |
A MULTIPHASE PULSE WIDTH MODULATOR FOR CLASS D AUDIO AMPLIFIERS |
摘要 |
A multiphase pulse width modulator (PWM) producing N mutually phase shifted PWM signals, which is well-suited for class D audio amplifier applications. The multiphase PWM includes (a) N+1 (N≧2) analog triangular waveform generators producing N+1 mutually phase shifted triangular waveforms, and (b) N+1 comparators each having a first input coupled to each of the N+1 triangular waveforms and a second input coupled to an audio signal to generate N+1 mutually phase shifted PWM phase signals. A crosspoint switch includes N+1 inputs coupled to the N+1 PWM phase signals, and N outputs to supply the N PWM signals. A crosspoint switch controller selectively connects each of the N+1 inputs to each of the N outputs for a duration of a cycle time in a time sequence to simultaneously generate the N PWM signals such that each signal has interleaved time segments of the N+1 PWM phase signals. |
申请公布号 |
EP3044873(A1) |
申请公布日期 |
2016.07.20 |
申请号 |
EP20140757947 |
申请日期 |
2014.09.01 |
申请人 |
MERUS AUDIO APS |
发明人 |
NIELSEN, ALLAN, NOGUERAS;HØYERBY, MIKKEL |
分类号 |
H03F3/217;H02M7/487;H03K7/08 |
主分类号 |
H03F3/217 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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