Patent ID: 9306517
Filing Date: 2016-04-05
CPC Classification: H03F

Claim Text:
1. A switching amplifier comprising: a pre-driver amplifier having a pre-driver output; a final stage amplifier having a final stage amplifier input and a final stage amplifier output, wherein the final stage amplifier input is coupled to the pre-driver output, and wherein the final stage amplifier input has a final stage amplifier input capacitance, wherein the final stage amplifier is configured to have a charging cycle and a discharging cycle whereby the final stage amplifier input capacitance stores energy during the charging cycle and the final stage amplifier input capacitance discharges energy during the discharging cycle, and a resonant circuit element coupled to the final stage amplifier input, wherein the resonant circuit element is configured to receive energy from the final stage amplifier input capacitance during the discharging cycle and supply energy to the final stage amplifier input capacitance during the charging cycle, a capacitance value of the final stage amplifier input capacitance during the discharging cycle being different from a capacitance value of the final stage amplifier input capacitance during the charging cycle, wherein the final stage amplifier comprises one or more transistors configured to be coupled between a supply voltage and a reference potential to simultaneously conduct a same current between the supply voltage and the reference potential.