11. (Continued)
In a sense, some linear signal flow paths could also be considered to be
convergent signal flow paths. For instance, the IF amplifiers in a standard
communications receiver are connected In series, but power must be supplied
to each amplifier from another source. The power input could be considered
as one of the inputs to the amplifiers, along with the various signal inputs
(as shown in figure 16).
Figure 1 6.
Computers also use convergent circuits. Figure 17 shows an AND circuit,
where all the inputs are required to produce an output, and it shows an OR
circuit, where any or all of the inputs could produce an output. Simply
stated, an input (or output)) is considered a High (H) or (1); no input (or
output) is considered a Low (L) or (0).
The best way to check a convergent signal flow path when there is no
output is to (choose one of the following)
(1) check only one of the inputs.
(2) check each or every input.
(3) check all the preceding stages (blocks).
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