Abstract
Polar modulation has been proven to be an effective way to build high-efficiency high-linearity power amplifier systems. In a polar transmitter, high-efficiency non-linear power amplifiers can be used for linearly modulated waveforms. Because of envelope bandwidth expansion in polar modulated transmitters, the design of a wide-bandwidth high-efficiency supply modulator is one of the most challenging aspects of a polar transmitter. The most common technique for providing wide-bandwidth low-noise supply modulation in a linear system PA is by using linear low-dropout regulators, however at backed-off power levels their efficiencies are low. Envelope tracking is another common technique for transmitter design. Although this technique relaxes the bandwidth requirement of the supply modulator, it uses a less efficient linear power amplifier. A parallel combination of linear and switch-mode regulators for a polar PA is proposed. A similar topology for EDGE PA regulators has been proposed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
