A multi-level pulse modulated polar transmitter using digital pulse-width modulation
Journal
IEEE Microwave and Wireless Components Letters
Journal Volume
20
Journal Issue
5
Pages
295-297
Date Issued
2010
Author(s)
Chen, J.-H.
Yang, H.-S.
Chen, Y.-J.E.
Abstract
This letter presents a multi-level pulse modulated polar transmitter architecture. Compared to a conventional gate-modulated envelope elimination and restoration transmitter, the use of the proposed technique is capable of reducing the in-band quantization noise level. Moreover, the proposed technique can increase the pulse-width modulation sampling frequency by relaxing its resolution requirement, which eases the filtering requirement at the output. A prototype transmitter system is constructed using commercially available components. Using a CDMA2000 1X signal at 836.5 MHz, it achieved over 40% power-added efficiency at 24.5 dBm output power level while passing the adjacent and alternate channel power ratios for the CDMA2000 standard.
SDGs
Type
journal article