| 摘要 |
PURPOSE:To detect pressure stably and highly accurately with simple constitution by using a latch type FF for a circuit which generates frequency differences. CONSTITUTION:When the pressure P is applied, the frequencies of vibrators 1, 2 change differentially. If the terminal CL rises to H by the signl f2 after the terminal D of a latch type FF 20 is made H by the signal f1, the output Q maintains H. Next, when the signal f1 is L and the signal f2 rises to H, the output Q lowers to L. Further, when the phase of the signal f1 advances relatively, and when the signal f1 is H and the signal f2 rises to H, the output Q rises to H. Thereafter, the beat signal f3 is outputted to the output Q by the repetition of the similar operation and the duty cycle of the modulating signal from a modulating part 30 decreases with an increase in the frequency of the signal f2 and increases with a decrease in the same way. The output of the modulating part 30 is smoothed and amplified by an output part 40, and the signal corresponding to the P is supplied to load. |
