By Topic

Power-amplifier-inserted transversal filter for application to pulse-density-modulation switching-mode transmitters

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
Shota Fujioka ; Dept. of Electr. Eng., Tokyo Univ. of Sci., Chiba, Japan ; Michiaki Kojima ; Hironori Izumi ; Yohtaro Umeda
more authors

A power-amplifier filter architecture is described in which a switching-mode power amplifier with pulse density modulation is inserted in each path of a transversal filter. This filter suppresses the quantization noise that remains at the output of the component power amplifiers as well as amplifies the signal with high efficiency. The center frequency and pass bandwidth of the filter can be varied widely by changing the delay difference between adjacent paths and changing the number of paths in the filter. Computer simulation of the output powers of the desired signal and the undesired signal (due mainly to quantization noise) reveals that use of this architecture greatly reduced the power of the undesired signal while maintaining the power of the desired signal, even when the number of paths is increased. Evaluation of the signal constellation and error vector magnitude after quadrature detection shows that the demodulated signals are not degraded even when the number of paths is increased.

Published in:

Communications and Information Technologies (ISCIT), 2012 International Symposium on

Date of Conference:

2-5 Oct. 2012