Abstract
An ultra-fast tracking power supply (UFTPS) for
envelope tracking in a 50kHz 64-QAM Tetra2 base station power
amplification system is demonstrated. A simple method for
optimizing the step response of the PID+PD sliding-mode control
system is presented and demonstrated, along with a PLL-based
scheme for locking the switching frequency to an external clock.
High UFTPS efficiency (up to 95%), very low ripple (5mVpp) and
a fast step response (10μs) are obtained from a single-phase buck
converter with a 4th-order output filter. This ripple performance
is demonstrated to be critical in the considered application. Also
demonstrated is the effect of non-zero UFTPS output impedance
on envelope tracking performance. At 13W average (156W peak)
RF output, a reduction of DC input power consumption from
93W (14% efficiency) to 54W (24% efficiency) is obtained by
moving from a fixed RF power amplifier supply to envelope
tracking.
| Original language | English |
|---|---|
| Title of host publication | Applied Power Electronics Conference and Exposition |
| Volume | 1 |
| Publisher | IEEE |
| Publication date | 2008 |
| Pages | 777-783 |
| ISBN (Print) | 978-1-4244-1874-9 |
| Publication status | Published - 2008 |
| Event | 23rd Applied Power Electronics Conference - Austin, TX, United States Duration: 24 Feb 2008 → 28 Feb 2008 Conference number: 23 http://www.apec-conf.org/2008/images/PDF/2008/apec08_preliminaryprogram_webcopy.pdf |
Conference
| Conference | 23rd Applied Power Electronics Conference |
|---|---|
| Number | 23 |
| Country/Territory | United States |
| City | Austin, TX |
| Period | 24/02/2008 → 28/02/2008 |
| Internet address |