In a radio communication system in a mobile to mobile call with one good and bad radio link, the good radio link is forced by the poor link to use a more robust AMR coded mode and thereby using excessive power. A column voltage booster produces a boosted column enable signal. The first patterned layer provides a pattern employed in etching a channel region of the thin film transistor structure. The piezoelectric aluminum nitride thin film formed on the lower electrode has a full-width half maximum of a rocking curve of a diffraction peak of 2.