An input buffer is presented for buffering an input signal having a voltage magnitude which alternates between a first voltage level and a second voltage level, where the first and second voltage levels may vary over time. The network element comprises at least one receiver arranged to receive a radio frequency signal from the at least one base station or the antenna array and modem logic operably coupled to the at least one receiver. Control circuits include techniques to interpolate phases at a high rotation rate while reducing discontinuities and risk for logic hazards. After the signal has been monitored, it is converted to a digital signal for transmission.