By David Wyatt, Mike Tooley
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Additional resources for Aircraft Digital Electronic and Computer Systems: Principles, Operations, and Maintenance
The analogue switches are controlled by the logic inputs so that the respective output is connected to the reference voltage (Vref) when the respective logic input is at logic 1 and to 0V when the corresponding logic input is at logic 0. When compared with the previous arrangement, this circuit offers the advantage that the reference voltage is considerably more accurate and stable than using the logic level to define the analogue output voltage. A further advantage arises from the fact that the reference voltage can be made negative in which case the analogue output voltage will become positive.
3 Boolean algebra Boolean algebra is frequently used to describe logical operations used in avionic systems. 3 AND and OR gates with both inputs inverted The rules (or laws) of Boolean algebra are as follows: The OR rules A+0=A A+1=1 The Commutative Law A+ A =1 A+B=B+A A+A=A A•B=B•A The NOT rules A + (B + C ) = (A + B) + C 0=1 A • (B • C) = (A • B) • C 1=0 The Distributive Law A• (B + C) = (A The AND rules A•0=0 • B) + A = A (double inversion) (A • C) Note that it is important to avoid confusing the symbols and laws of Boolean algebra with those that apply to conventional algebra!
3. Show how an exclusive-OR gate can be made by combining AND, OR and NOT gates. 2 1. Draw the truth table and state the Boolean expression for the logic gate arrangement shown in Fig. 10. 2. State the Boolean logic expression for the logic gate arrangement shown in Fig. 11. 3. Devise a logic gate arrangement that provides the output described by the truth table shown in Fig. 12. 5 Tri-state logic Tri-state logic devices operate in a similar manner to conventional logic gates but have a third, highimpedance output state.