Low frequency dithering technique for linearization of current mode class D amplifiers

F. Arfaei Malekzadeh, Arthur Roermund, van, Reza Mahmoudi

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

4 Citations (Scopus)
1 Downloads (Pure)


Traditionally, dithering has been used to avoid unwanted non-linear effects in transmitter amplifiers. According to conventional understanding, such techniques require a high frequency dithering signal, i.e., dithering frequencies larger than the signal frequency. A problem with this approach is that it results in a reactive power loss that increases with the dithering frequency. In one aspect, the present invention provides an improved transmitter amplifier in a digital communication system. Surprisingly, the transmitter amplifier employs dithering at a frequency lower than the signal frequency. Using this technique, a hard nonlinear characteristic can be linearized using a dither signal component whose main frequency is at least twice the bandwidth of the input band-pass signal. The input and dithering frequencies should be incommensurable. To achieve increased robustness and augmented linearity, the amplifier is preferably implemented with negative feedback.
Original languageEnglish
Title of host publicationProceedings of the IEEE International Microwave Symposium (IMS2012), June 17-22, Montréal, Canada
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Publication statusPublished - 2012
Eventconference; IMS2012; 2011-06-17; 2011-06-22 -
Duration: 17 Jun 201122 Jun 2011


Conferenceconference; IMS2012; 2011-06-17; 2011-06-22


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