Patent ID: 7164900
Filing Date: 2007-01-16
Classification: H04B

Abstract:
1. An impulse waveform generating apparatus comprising: an oscillator for generating a reference signal having a center frequency in a frequency band of an impulse to generate; a timing matching circuit for generating a phase shift signal by phase-shifting the reference signal with 90 degrees; a frequency demultiplier circuit for dividing a frequency of the phase shift signal and obtaining a timing signal having a frequency component corresponding to a frequency width of the impulse to generate; a waveform forming section for forming a waveform in synchronism with the timing signal, according to information of a shape table having a predetermined waveform; a low-pass filter for removing an unwanted higher harmonic component from an output signal of the waveform forming section and generating an envelope signal; and a waveform generating section for changing an amplitude of the reference signal correspondingly to a value of the envelope signal.