Patent ID: 9660632
Date: 2017-05-23
CPC Classifications: H03F,H03K,H03M

Claim:
1. An apparatus, comprising: an output node; a first source for driving the output node in a positive direction; a first switch coupled to the first source and to the output node; a second source for driving the output node in a negative direction; a second switch coupled to the second source and to the output node; and a controller coupled to the first switch and coupled to the second switch and configured to perform steps comprising: receiving a reference signal; operating the first switch and the second switch to generate a pulse width modulation (PWM) representation of the reference signal at the output node; and adjusting a time duration that the first switch and the second switch are coupled to the output node based, at least in part, on an envelope level of a desired output signal at the output node, wherein adjusting comprises: