A keel is provided having a spring portion and a connecting portion. An H level potential or an L level potential is written to a node of a memory cell. The wideband LPC coefficients are obtained from wideband LSFs. The power controller causes a charge to be applied to the load by selectively closing the first controlled power switch, thereby providing a charge from the first battery to the load, andor selectively closing the second controlled power switch, thereby providing a charge from the second battery to the load. The method comprises at least providing a number of substrates; cleaning the substrates; and placing the substrates into a reaction liquid; vibrating the reaction liquid by ultrasonic waves such that a thin film is grown on the substrates evenly. The amplifier arrangement furthermore includes a first coupling impedance, which couples a first supply voltage terminal of the amplifier arrangement to a second terminal of the first transistor, and at least one further coupling impedance, which couples the first supply voltage terminal to a second terminal of the at least one further transistor.