Abstract
Aclass-D amplifier with an amplifier input and an amplifier output, comprising: an input stage (308) with a self-oscillating pulse-width modulator (304) configured to receive an analog input signal via the amplifier input and to output a digital signal; an output stage (305) configured with semiconductor devices to amplify the digital signal; an output filter (306), configured as a low-pass, high Q filter, coupled between the output stage and the amplifier output; and a feedback circuit (309) coupled to the output filter (306) and to the input stage (308). The feedback circuit (309) is coupled at the output filter (306) to measure a set of states comprising at least two of: current (IL) through the output filter inductor, output current (Ispk) and output voltage (Vspk); and the feedback circuit (309) and the input stage (308) are operatively coupled as a controller configured to control all of the states in the set of states while operatively suppressing a frequency peak at a resonance frequency of the output filter.
| Original language | English |
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| IPC | H03F 3/ 217 A I |
| Patent number | WO2018211085 |
| Filing date | 19/05/2017 |
| Country/Territory | International Bureau of the World Intellectual Property Organization (WIPO) |
| Priority date | 19/05/2017 |
| Priority number | EP20170172028 |
| Publication status | Published - 22 Nov 2018 |