Abstract: The invention relates to a method and an apparatus for using a wide keyboard including a wide range of keys in small mobile devices. A method relates to operating a mobile device having a touch sensitive display divided in input and output portions. A first location of a tactile input is detected on an input portion of the touch sensitive display displaying a plurality of keys. Next the input portion display view is zoomed by displaying and linearly magnifying the detected tactile input area and it's surrounding. A second location of a tactile input is detected and a key on the location of a second detected tactile input is highlighted. The highlighted key is activated and identified as an input.

Abstract: To go from a coupled high level to a decoupled low level, a source unit (SU) of a transmitter (T) must be decoupled from a transmission line (TL) by a impedance unit (IU). As a result, oscillatory transition phenomena appear in the output signal and this signal possibly goes beyond a prescribed template. To avoid such overshoot problems the present transmitter (T) decreases the signal level during a decrease period before decoupling the source unit (SU) from the transmission line (TL). Therefore a source control circuit (SCC) is included in the control unit (CU) of the transmitter (T) for controlling the source level in such a way that the output signal level is decreasing.