Patent ID: 7177418

Claim:
A class G amplifier comprising: a differential driver device having a positive side supply rail and a negative side supply rail; positive side and negative side switch circuits, each having an output and each comprises first, second, and third switch pairs, each switch pair coupled between a high supply voltage and a low supply voltage: each switch pair having first and second gate control nodes and an output node: the output node of the first switch pair couples to the first gate control node of the third switch pair: the output node of the second switch pair couples to the second gate control node of the third switch pair: and the output node of the third switch couples to the output of the corresponding positive side or negative side switch circuits: each positive side and negative side switch circuit further comprises a control circuit, coupled to each gate control node of the first, second and third switch pairs: and the output of the positive side switch circuit couples to the positive side supply rail of the differential driver and the output of the negative side switch circuit couples to the negative side supply rail of the differential driver: whereby the positive and negative side supply rails couple to a target supply voltage and the voltage is maintained.