Logic gates input signals

Logic gates are devices that can perform basic logic operations, depending on the nature of the input and output signals. The relation between the inputs and outputs is summarised in the truth table of the logic gate. 

Figure 7.6 shows the schematic of the complete circuit schematic that provides this logic function. The binary counter circuit (Fig. 7.1) provides the input signals, and the AND gates provide the decoder logic. The clock signal is 100 KHz at 50% duty cycle. 

The off-on-off signaling system of 76 and [Co(CN)6]3 at pH 3.6 from Pina and colleagues also behaves as an XOR logic gate [147], While this system can be operated in several interesting formats, we consider only the simplest. The two inputs are two isoenergetic pulses (of 355 nm), each of which causes sufficient photoreaction to give maximal production of 77. If both inputs are applied, the photoaquation of [CoCN)6]3 also occurs to increase the pH and to return 77 back to 76. Thus, the 77 concentration is minimal, just as if no input were applied at all. The irreversibility of the photoaquation is an aspect which it is hoped will be improved in later versions of this system. 

Fig. 6 Molecular-scale implementation of logical gates based on the fluorescence signals of the anthracene unit. Inputs = 0 means...

NOT gate A type of logic gate that reverses the input signal. Sometimes called an inverter gate. NPN transistor a transistor that is signaled by a positive charge. 

OR gate A type of logic gate where either input of on (1) signals an output of on (1). origin The origin point (O or 0,0) is where the x-and y-axes intersect. 

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