Patent ID: 8223883
Filing Date: 2012-07-17
Classification: H03F,H04B,H04L

Abstract:
1. A transmission circuit for generating a transmission signal based on inputted data, and outputting the transmission signal, the transmission circuit comprising: a signal generation section operable to generate an amplitude signal and one of a frequency signal and a phase signal, based on an amplitude component and a phase component, respectively, both of which are obtained through signal processing of the inputted data; an angle modulation section operable to perform angle modulation of the one of the frequency signal and the phase signal; a delay time adjustment section operable to adjust a delay time of the amplitude signal; an amplitude amplification section operable to output a signal based on a magnitude of the amplitude signal having the delay time adjusted; an amplitude modulation section operable to amplitude-modulate a signal outputted by the angle modulation section, by the signal outputted by the amplitude amplification section, and output an obtained signal as a modulated signal; and a delay processing circuit operable to calculate a delay time difference between the amplitude signal and the one of the frequency signal and the phase signal, based on the modulated signal, and to perform feedback control for the delay time which is to be adjusted by the delay time adjustment section such that the delay time difference is reduced, during only a predetermined test period, wherein the signal generation section outputs a sinusoidal signal as the amplitude signal and a sinusoidal signal as the one of the frequency signal and the phase signal during the predetermined test period, and wherein when ω