John said:
Too many to list them all. But..
eq 7.6 "within an order of magnitude". How useful is that? How pompous
is that?
not very
p 261, "An interesting consequence..." is silly, double so when
qualified by the next sentence.
LMAO! It says, btw "An interesting consequence of this connection is
that an inner-layer trace radiates no more or less than an outer layer
trace. THIS IS PARTICULARLY TRUE FOR TRACES NEAR THE EDGE OF THE BOARD"
Same page, "At the point..." gets back to the incredible illusions
lots of people have about return currents.
fair call.
p 265, power rule 2 is strange.
and one I violate all the time. Mostly because ground is the reference,
and as long as I have enough noise margin I dont care a fig how wobbly
Vcc gets.
279, "Combining TTL..." is contentless. Big DUH. Lots of his writing
is annoying like this. Same page, bullet "To reduce noise leakage" is
nonsense. What is "noise leakage" anyhow?
not just contentless, but meaningless too. Why stop there: "combining 2
or more gates in one system without considering the system design
consequences is not a good idea"
Hey, lets abridge it:
"Not considering the system design consequences is not a good idea"
aka
"some semblence of understanding is required"
312, sec 9.5, is absurd. Return current fetishes again.
here I dont quite get your complaint. its all about considering (and
minimising) the total inductance of the physical loop around which
current flows.
But fig 9.11 WILL function properly at high speeds - it will ring like a
SOB, which is the proper function of such a physical construction.
316, in the box: "Always fails". Gimme a break.
So all we need to do is cover it with a thin layer of pvc, to avoid
"exposure" eh? especially those nano-inch exposed wires
12.12.1 Claims 20,000 * 8KHz = 154.4 MHz.
Perhaps he was using Roberts special abacus, and mis-counted the number
of beads.
Well, you get the idea. The book is a mixture of good stuff and
nonsense. If you know enough to tell which is which, you don't need
the book!
John
I would argue that:
1) its a damn good start
2) if you read and understand it, it can function as its own bullshit
detector.
3) compared to, say, Tsaliovich's book on cable shielding, its a joy to read
4) compared to, say, anything ever published by TAB books (or "authored"
by Irving Gottlieb or Randy Sloane), it contains useful information with
enough formulae and references to point you in the right direction
How about p.376 "every clock oscillator contains a very fine
high-frequency amplifier"
what, extremely thin? Shitty clock bricks, by definition, have shitty hf
amplifiers....
Cheers
Terry