Prof. Dr. Thorsten Jungmann (last updated 2026-10-12)
Relates to DET-02 Logic operations
Task
The controller of a heat pump forms the collective fault as the OR of twelve fault bits. Only OR gates with two inputs are available, each with a propagation delay of . This exercise is based on a concept check in the textbook by LaMeres [5, p. 111].
a) How many gates does the circuit need?
b) Arrange the gates so that the collective fault is valid as early as possible. How many stages does the circuit then have?
c) What is the propagation delay of the circuit?
Solution
a) 11 gates
b) 4 stages, for example with 6, 3, 1 and 1 gates
c) 36 ns