| 摘要 |
PURPOSE:To increase the frequency pull-in range without generating the folded element of a phase error signal and with no limit cycle due to the folded element. CONSTITUTION:A complex multiplier 13, whose one complex signal is an input and the other one is a carrier input with cosine or cosine characteristic, performs the complex multiplication. The phase error of the output is detected by the sinewave phase comparison characteristic by a phase error detection part 15 and a phase error conversion part 16. The phase error output is smoothed by a loop filter 17, to be inputted to the oscillation frequency control of a numerical control oscillator 18. The output of the numerical oscillator 18 is converted into the sine or cosine characteristic in a data converter 19 to be outputted as a carrier. |
