抄録
In the fluitlic digital circuits using reattachment amplifiers, pressure pulse signal is used usually. Pulse wave form varies with connecting conditions such as line length and branching. Prediction of the switching times of the amplifier for these inputs is very important in the circuit design.
This paper first describes the switching model to calculate the distribution of the switching times of the reattachment amplifier, which is based on the transient response of an attached jet and the random switching characteristics. The jet displacement is obtained from the attached jet model which considers the control duct and the attachment bubble. It is assumed that the switching occurres due to the random switching and the switching probability is determined by the jet displacement. The effect of jet movement is included by an experimental constant.
Next, the distributions of the switching times for the pulse inputs are measured to determine the experimental constant and the relation between input wave form and the distribution is discussed.Finally, the pressure wave forms and the distributions of the switching times are measured for the branched line system which is often used in the digital circuit. The characteristics of the wave forms are discussed and the effects on the distribution are made clear. The distributions for these inputs are calculated by using the switching model and the calculated results ware agreed with the experimental results. So it was verified that the distribution of the switching times could be calculated for the given input wave form by using this switching model.
These results are useful for the design of the fluidic digital circuits using reattachment amplifiers.
