Low current differential signal/swing I/O interfaces and techniques can be implemented. An output interface converts input data signals to differential current signals for transmission over transmission lines. When the differential current signals are received by an input interface, they are converted to differential voltage signals and appropriately amplified.
A method and apparatus for single-to-differential conversion includes a single-to-differential stage (22), a phase balancing stage (24), and a buffer stage (26). The single-to-differential stage (22) converts a single input signal (V.sub.clk) to a first and second output signal (V.sub.n, V.sub.p), where the first and second output signals (V.sub.n, V.sub.p) correspond to one another. The phase balancing stage (24) is electrically connected to the single-to-differential stage (22), balances and receives the first and second output signals (V.sub.n, V.sub.p), and outputs first and second balanced output signals (V.sub.+, V.sub.-). The buffer stage (26) is electrically connected to the phase balancing stage (24) for shaping the first and second balanced output signals (V.sub.+, V.sub.-). The single-to-differential converter (20) is operable over a substantially large bandwidth and achieves low-power consumption and good phase noise performance.
