Abstract
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 language | English |
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Title of host publication | Proceedings of the IEEE International Microwave Symposium (IMS2012), June 17-22, Montréal, Canada |
Place of Publication | Piscataway |
Publisher | Institute of Electrical and Electronics Engineers |
Pages | 1-3 |
DOIs | |
Publication status | Published - 2012 |
Event | conference; IMS2012; 2011-06-17; 2011-06-22 - Duration: 17 Jun 2011 → 22 Jun 2011 |
Conference
Conference | conference; IMS2012; 2011-06-17; 2011-06-22 |
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Period | 17/06/11 → 22/06/11 |
Other | IMS2012 |