Patent ID: 7414463

Claim:
A PPM (pulse position modulated) signal demodulator for receiving and demodulating a PPM signal transmitted in an ultra wide band radio communication system using an ultra wide band, comprising: a rectifier for receiving and rectifying the PPM signal to obtain an absolute value signal; a first integrating comparator for integrating the absolute value signal for every first integral time and comparing integrated values with each other for every integral time; a second integrating comparator for integrating the absolute value signal for every second integral time and every third integral time on a time-sharing basis and comparing the integrated values with each other for every integral time; a determining circuit connected to an output of said first integrating comparator for determining the PPM signal on a basis of an integrated and compared result by said first integrating comparator to output demodulated data; a control circuit for generating first, second and third integral interval control signals for controlling the first, second and third integral times, respectively, on a basis of respective integrated and compared results by Said first and second integrating comparators; and a first switching circuit for selectively supplying either of the second integral interval control signal and the third integral interval control signal to said second integrating comparator, said first integrating comparator integrating the absolute value signal for a length of the first integral time associated with the first integral interval control signal, said second integrating comparator integrating the absolute value signal for a length of the second or third integral time respectively associated with the second or third integral interval control signal fed from said switching circuit.