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High efficiency voltage mode class D topology

  • US 10,230,341 B2
  • Filed: 01/08/2018
  • Issued: 03/12/2019
  • Est. Priority Date: 09/10/2013
  • Status: Active Grant
First Claim
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1. A voltage mode class D power amplifier comprising:

  • a first pair of N-GaN transistors connected in series between a voltage source and a ground connection, the first pair of N-GaN transistors comprising an upper first pair N-GaN transistor and a lower first pair N-GaN transistor, the upper and lower first pair N-GaN transistors each having a gate, a source and a drain, the drain of the lower first pair N-GaN transistor being connected to the source of the upper first pair N-GaN transistor, and the gates of the upper and lower first pair N-GaN transistors coupled to a control circuit to alternatively turn on and turn off the upper and lower first pair N-GaN transistors;

    a second pair of N-GaN transistors connected in series between a voltage source and a ground connection, the second pair of N-GaN transistors comprising an upper second pair N-GaN transistor and a lower second pair N-GaN transistor, the upper and lower second pair N-GaN transistors each having a gate, a source and a drain, the drain of the lower second pair N-GaN transistor being connected to the source of the upper second pair N-GaN transistor, and the gates of the upper and lower second pair N-GaN transistors coupled to the control circuit to alternatively turn on and turn off the upper and lower second pair N-GaN transistors;

    a first switch node disposed between a source of a first N-GaN transistor of the first pair of transistors and a drain of a second N-GaN transistor of the first pair of N-GaN transistors;

    a second switch node disposed between a source of a first N-GaN transistor of the second pair of transistors and a drain of a second N-GaN transistor of the second pair of N-GaN transistors;

    a tank circuit comprising an inductor connected between the first switch node and the second switch node, and a capacitor forming a series resonant circuit with a load to be driven, the tank circuit enabling the power amplifier to operate as a no-load buck converter with zero voltage switching.

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