Abstract: A method and apparatus for measuring an elapsed time from a starting signal to an ending signal in a time-to-digital converter. Primarily, the invention calculates an amount of complete cycles from the starting signal to a starting edge of a next clock cycle or the next Nth clock cycle (N is a natural number great than one) after the clock cycle corresponding to the ending signal. The amount is multiplied by a cycle time of the coarse clock to obtain a coarse time value. A time residue is calculated from the ending signal to the starting edge. Finally, the time residue is subtracted from the coarse time value to obtain a required time.

Abstract: A signal receiver circuit including a transmission gate, a pull-low unit, a boost capacitor, a voltage division unit, and a receiver unit is provided. The transmission gate determines whether to conduct an input signal according to a control signal. The pull-low unit determines whether to pull down the voltage at a terminal of the boost capacitor according to the control signal. The boost capacitor boosts the input signal of the receiver unit. The voltage division unit sends a divided voltage to another terminal of the boost capacitor according to the control signal. When an input signal is received, the boost capacitor boosts the input signal, for overcoming low current issue caused by high threshold voltage of MOS transistors and accordingly the receiver unit achieves full swing.

Abstract: A signal receiver circuit including a transmission gate, a pull-low unit, a boost capacitor, a voltage division unit, and a receiver unit is provided. The transmission gate determines whether to conduct an input signal according to a control signal. The pull-low unit determines whether to pull down the voltage at a terminal of the boost capacitor according to the control signal. The boost capacitor boosts the input signal of the receiver unit. The voltage division unit sends a divided voltage to another terminal of the boost capacitor according to the control signal. When an input signal is received, the boost capacitor boosts the input signal, for overcoming low current issue caused by high threshold voltage of MOS transistors and accordingly the receiver unit achieves full swing.