| 摘要 |
PURPOSE:To increase the varying range for a phase control and to improve the linearity, by synthesizing an output of the 1st frequency multiplier via a 2-branch circuit and a phase shift means and an output of the 2nd multiplier multiplying the output of the branch circuit and connected in parallel with said circuits, with a multiplier and passing through only a specific frequency with a filter. CONSTITUTION:A signal applied to an input terminal 4 is branched into two; one is applied to a phase shift circuit 22 and subjected to a phase shift of theta=k vC with a control voltage vC from a terminal 5. This signal is multiplied by N for the frequency with a frequency N-multiplier 23. Another output signal of a signal branch circuit 21 is applied to frequency (N-1)-multiplier 24, where the frequency is multiplied by (N-1). The signal multiplied by N and that multiplied by (N-1) are applied to a multiplier 25 for multiplication and outputted via a band-pass filter 26. This output signal has a value of N-multiplication to the phase shift theta of the phase circuit 22. |
