In a fluid-pumping system comprising a pump and a pulsation dampener, which is arranged to dampen pressure pulsations, the pump is driven by air delivered at a regulated pressure. The true logic state of a stored bit is rewritten to a first storage node of the memory cell and the complementary logic state of the stored bit is rewritten to a second storage node of the memory cell. Telephone numbers of related callers may be grouped into caller groups. In each time slice, data is transmitted using the arbitration parameters of the group. Process and temperature dependencies of the amplitude are eliminated while achieving low phase noise and large signal-to-noise ratio in the output signal, and consequently low phase noise.