Patent ID: 8704602
Filing Date: 2014-04-22
Classification: H03C,H03L

Abstract:
1. A two-point modulation device using a voltage controlled oscillator, the two-point modulation device comprising: a modulation section including a feedback circuit configured to conduct feedback control of an output signal from the voltage controlled oscillator based on an inputted modulation signal, and a feed-forward circuit configured to calibrate the modulation signal and outputting the calibrated modulation signal to the voltage controlled oscillator; a signal output section configured to output, to the modulation section, a predetermined reference signal instead of the modulation signal when a calibration is conducted; and a gain correction section configured to, in a state where the feedback circuit is forming an open loop, calculate a frequency transition amount of the reference signal outputted by the voltage controlled oscillator, and correct a gain used for calibrating the modulation signal at the feed-forward circuit based on the calculated frequency transition amount.