WIRELESS TRANSMITTING CIRCUIT AND WIRELESS TRANSMITTER

摘要

PROBLEM TO BE SOLVED: To provide a wireless transmitting circuit capable of reducing a peak which is caused in the spectrum of a radio signal by preventing the time width of a jitter from becoming discrete, and a wireless transmitter using the same.

SOLUTION: A wireless transmitting circuit comprises: a modulation unit 23 which generates a first modulation signal S1 by making a logic value for one bit of transmission data SD correspond either to a pulse no-presence block B0 or to a pulse presence block B1; a random signal generating unit 242 which generates a random signal which includes a center voltage in an amplitude of the first modulation signal S1 and in which a voltage varies at random within a range of an amplitude smaller than the amplitude; a comparator 243 which compares a voltage level of the first modulation signal S1 with a voltage level of the random signal S12 and outputs a random modulation signal S2 of which the voltage is varied in accordance with the result of the relevant comparison; and an SRD circuit 27 which generates a short pulse signal P in accordance with the random modulation signal S2 outputted from the comparator 243.

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