fast flop NB7V52

My first oscilloscope didn't have trig it had sync and I had to wait for the valves to warm up.

"Jeroen Belleman" snipped-for-privacy@nospam.please wrote in message news:113e92k$34idt$ snipped-for-privacy@dont-email.me...

With the alternate solver the resistor has to be at least 1e-19 ohms. Any lower than that and you get a 50MHz oscillator instead.

If anyone can explain that to me I'm all ears.

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Yeah, the obvious shift register won't work without adding prop delays.

Sounds like adding some rise and fall works too.

Doing any serious logic in LT is still horrible. I tried a DDS phase accumulator and gave up. I wrote a PowerBasic problem to generate a PWL file and sent that to LT Spice for filtering and such.

Apparently Qspice is much better.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

For a certain - rather bizazrre - understanding of "aligning logic clocks in time".

The speed of light makes that more difficult, but if you know the distances between the devices you know long the signal will take to get there, and you can correct for it. In fact people measure the propagation delays involved and correct for them. They are pretty stable.

A data stream can't be an explicit clock?

You clearly don't understand the NIF timing system - as what you have posted above makes clear. Your VME modules hang off it, rather than contribute to it.

Pointing out that somebody is posting ignorant nonsense is a necessary part of robust technological debate. Somebody too ignorant to realise that they are posting ignorant nonsense is going to feel hurt by the observation, but it is necessary to call out ignorance.

Not half as curious as a pig-ignorant purveyor of high-tech equipment.

The place is full of tourist traps. I wasn't a tourist. Some of my visiting friends were, but I rarely joined them.

Duxford? Drove past it regularly going from London to Cambridge - may have dropped in once to accommodate a visiting friend, but it didn't make much of an impression. Nothing I saw was unfamiliar.

John Larkin trolls for flattery, but doesn't really know how to bait the hook.

I'm certainly not going to flatter John Larkin, but he has been known to hunt for flattery in serious discussions, and sometimes manages to earn some. He's not a complete idiot.

There are people who can manage serious discussion around the attention seekers. Not all that many, but s.e.d. has a hard core. John Larkin was our most prolific poster for a long time - and may still be, the statistics aren't easily available any more - but he didn't get in the way too much.

I'd think that for any circuit with sufficient gain and delayed feedback, there will be some frequency at which it can oscillate.

Rather than specifying Td, try specifying Trise and Tfall, or Tau. That will reduce the bandwidth and should quench it.

In your schematic, I got it to work with Tau=1n for A1 and A2, Tau=2n for A4, A5 and A8, and Tau=3n for A3. Curiously, with Tau=2n for all gates, it still misbehaves. I suppose this is a good demo of why Spice is a poor logic simulator.

Then again, I wouldn't make a D-flop like that.

Jeroen Belleman

Well, I helped design the system. It's more interesting than a stirred water bath.

The VME timing modules use an ECL flop as the clock recovery detector. It's a bang-bang phase-locked loop with a roughly 1e12 volt/second slope.

The incoming data stream is the clock of the phase detector flop and the local XO is D. Sorta backwards. Metastability is the prize for being right.

Bang-bang PDs are unpopular for some reason.

I confess that I don't understand the loop. I don't need to understand things, I just need to make them work.

I could post the circuit if there were popular demand.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

I've never designed a thermostatted stirred water bath. My 1996 paper was about Peltier-junction based thermostat. The first version did use circulating water to take away the waste heat from the Peltier junctions, but one of colleagues replaced that with a heat pipe.

There is a classic paper from the US NBS on a micro-degree stirred water bath which I did cite, along with a more interesting (if less well-informed) one that relied on the stirrer to provide the heat input to the water bath.

Sounds crude.

Even cruder.

Switching noise. If you can extract a signal that is smoothly proportional to the phase difference, you can get a quieter output. You still have to filter the phase signal you are extracting, and the filter phase shift can make the control loop unstable if you don't know what you are doing.

That's obvious. They'd probably work better if you did understand a bit more about what you were doing.

Comic contributions are always welcome.

There's a long and important list of inventions done by people who didn't understand how they work. Usually inventions happen and then the the science takes some time to explain what happened.

Understanding sometimes helps, but demanding understanding severely restricts possibilities.

Ultimately, we don't understand anything; we just explain some top levels.

Instinct > experiment > science. Or, even better

Instinct > simulation > product and maybe then some science.

John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics

"Jeroen Belleman" snipped-for-privacy@nospam.please wrote in message news:113fhu0$3fhs1$ snipped-for-privacy@dont-email.me...

Your divide by 3 circuit works in CMOS but I had to slow things down a bit to get it to simulate.

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2368 -928 0 FLAG 2320 -768 Vdd FLAG 2320 -192 0 FLAG 2368 -416 0 FLAG 2368 -240 0 FLAG 2080 -2464 Ck FLAG 2080 -2288 B FLAG 2080 -1776 A FLAG 2080 -1600 B FLAG 2096 -1088 Ck FLAG 2096 -912 nA FLAG 2080 -400 nCk FLAG 2080 -224 C FLAG 3248 -896 0 FLAG 3248 -720 0 FLAG 3200 -496 0 FLAG 3248 -544 0 FLAG 3200 -1392 Vdd FLAG 3664 -1152 C FLAG 3248 -1040 0 FLAG -1392 -1856 0 FLAG -1424 -2208 Vdd FLAG -1440 -1808 0 SYMBOL voltage -1744 -1760 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value PULSE(0 5 10n 4n 4n 1m 2m 30) SYMBOL voltage -1040 -1424 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL pmos4 -592 -2672 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M27 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 -304 -2672 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M28 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 -496 -2592 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M29 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 -496 -2416 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M30 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 -592 -2000 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M31 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 -304 -2000 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M32 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 -496 -1920 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M33 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 -496 -1744 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M34 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 -592 -1328 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M35 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 -304 -1328 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M36 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 -496 -1248 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M37 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 -496 -1072 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M38 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 192 -592 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M39 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 480 -592 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M40 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 672 -592 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M41 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 288 -512 R0 WINDOW 0 -48 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M42 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 288 -336 R0 WINDOW 0 -46 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M43 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 288 -160 R0 WINDOW 0 -49 25 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M44 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 880 -592 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M45 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 880 -512 R0 WINDOW 0 -12 -10 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M46 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 -1152 -2000 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M47 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 -1152 -1920 R0 WINDOW 0 -12 -10 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M48 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 400 -2272 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M49 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 688 -2272 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M50 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 496 -2192 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M51 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 496 -2016 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M52 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 400 -1600 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M53 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 688 -1600 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M54 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 880 -1600 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M55 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 496 -1520 R0 WINDOW 0 -48 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M56 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 496 -1344 R0 WINDOW 0 -46 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M57 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 496 -1168 R0 WINDOW 0 -49 25 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M58 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 1264 -2240 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M59 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 1552 -2240 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M60 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 1744 -2240 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M61 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 1360 -2160 R0 WINDOW 0 -48 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M62 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 1360 -1984 R0 WINDOW 0 -46 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M63 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 1360 -1808 R0 WINDOW 0 -49 25 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M64 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2176 -2624 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M65 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2464 -2624 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M66 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 2272 -2544 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M67 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 2272 -2368 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M68 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2176 -1936 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M69 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2464 -1936 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M70 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 2272 -1856 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M71 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 2272 -1680 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M72 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2176 -1248 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M73 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2464 -1248 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M74 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 2272 -1168 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M75 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 2272 -992 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M76 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2176 -560 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M77 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2464 -560 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M78 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 2272 -480 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M79 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 2272 -304 R0 WINDOW 0 -41 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M80 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 3056 -1184 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M1 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 3344 -1184 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M2 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 3536 -1184 R180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M3 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 3152 -960 R0 WINDOW 0 -48 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M4 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 3152 -784 R0 WINDOW 0 -46 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M5 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 3152 -608 R0 WINDOW 0 -49 25 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M6 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 2880 -1184 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M7 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 3152 -1104 R0 WINDOW 0 -48 27 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M8 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u SYMBOL pmos4 -1488 -2000 M180 WINDOW 0 -16 -8 Left 2 WINDOW 3 36 31 Left 2 SYMATTR InstName M9 SYMATTR Value P_1u SYMATTR Value2 l=1u w=10u SYMBOL nmos4 -1488 -1920 R0 WINDOW 0 -12 -10 Left 2 WINDOW 3 62 21 Left 2 SYMATTR InstName M10 SYMATTR Value N_1u SYMATTR Value2 l=1u w=10u TEXT -1304 -1360 Left 2 !.tran 0 40m 0 TEXT 1096 -560 Left 2 ;Output A is the 1/3 clock output. TEXT -1752 -2848 Left 2 ;Asynchronous divide-by-three. TEXT -1752 -2816 Left 2 ;Jeroen Belleman - 20260717 TEXT -1760 -2632 Left 2 !.MODEL N_1u NMOS LEVEL = 3\n+ TOX = 200E-10 NSUB = 1E17 GAMMA = 0.5 PHI = 0.7 VTO = 0.8 DELTA = 3.0 UO =

Yes and no. What matters is what the system matrix generated by all those deleted lines looks like. Often the result is something unphysical, which will cause the math to do something strange.

So, the strategy is to suppress everything needless, so it cannot be interpreted strangely. I've seen such things happen in MATLAB for instance. Also Mathematica. (I don't use SPICE enough to matter.)

Joe

There is something odd with your file. I redrew your schematic in the form I'm more familiar with (see below) and it runs no problem in about 0.1s on my machine, but for some reason your file behaves differently.

Version 4.1 SHEET 1 880 680 WIRE -912 -816 -912 -832 WIRE -928 -800 -1200 -800 WIRE -768 -800 -864 -800 WIRE -624 -800 -768 -800 WIRE -928 -768 -1024 -768 WIRE -1024 -704 -1024 -768 WIRE -768 -704 -768 -800 WIRE -1024 -576 -768 -704 WIRE -1024 -576 -1136 -576 WIRE -768 -576 -1024 -704 WIRE -624 -496 -624 -800 WIRE -512 -496 -624 -496 WIRE -1024 -480 -1024 -576 WIRE -944 -480 -1024 -480 WIRE -768 -480 -768 -576 WIRE -768 -480 -880 -480 WIRE -512 -464 -624 -464 WIRE -336 -464 -448 -464 WIRE -288 -464 -336 -464 WIRE -240 -464 -288 -464 WIRE -944 -448 -1024 -448 WIRE -624 -352 -624 -464 WIRE -336 -352 -336 -464 WIRE -1264 -320 -1328 -320 WIRE -1200 -320 -1200 -800 WIRE -1200 -320 -1264 -320 WIRE -1024 -320 -1024 -448 WIRE -752 -320 -1024 -320 WIRE -624 -288 -336 -352 WIRE -336 -288 -624 -352 WIRE -1328 -272 -1328 -320 WIRE -624 -192 -624 -288 WIRE -512 -192 -624 -192 WIRE -1328 -160 -1328 -192 WIRE -512 -160 -624 -160 WIRE -336 -160 -336 -288 WIRE -336 -160 -448 -160 WIRE -1264 -16 -1328 -16 WIRE -912 -16 -1264 -16 WIRE -752 -16 -752 -320 WIRE -752 -16 -848 -16 WIRE -912 16 -1008 16 WIRE -1008 80 -1008 16 WIRE -752 80 -752 -16 WIRE -1008 176 -752 80 WIRE -752 176 -1008 80 WIRE -1008 240 -1008 176 WIRE -912 240 -1008 240 WIRE -752 256 -752 176 WIRE -752 256 -848 256 WIRE -624 256 -624 -160 WIRE -624 256 -752 256 WIRE -608 256 -624 256 WIRE -1136 272 -1136 -576 WIRE -912 272 -1136 272 WIRE -1200 304 -1200 -320 WIRE -912 304 -1200 304 WIRE -1328 448 -1328 -16 WIRE -336 448 -336 -160 WIRE -336 448 -1328 448 FLAG -288 -464 Q FLAG -1328 -160 0 FLAG -1264 -320 CLK FLAG -1264 -16 D SYMBOL Digital\\and -912 -400 M180 WINDOW 3 -37 117 Left 2 SYMATTR Value Td=10n SYMATTR InstName A8 SYMBOL voltage -1328 -288 M0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value PULSE(0 1 0 1n 1n 1m 2m 100) SYMBOL Digital\\and -896 -720 M180 WINDOW 3 -34 115 Left 2 SYMATTR Value Td=10n SYMATTR InstName A1 SYMBOL Digital\\and -480 -544 R0 WINDOW 3 -37 117 Left 2 SYMATTR Value Td=10n SYMATTR InstName A2 SYMBOL Digital\\and -480 -240 R0 WINDOW 3 -37 117 Left 2 SYMATTR Value Td=10n SYMATTR InstName A3 SYMBOL Digital\\and -880 336 M180 WINDOW 3 -37 117 Left 2 SYMATTR Value Td=10n SYMATTR InstName A4 SYMBOL Digital\\and -880 64 M180 WINDOW 3 -37 117 Left 2 SYMATTR Value Td=10n SYMATTR InstName A5 TEXT -1648 72 Left 2 !.tran 0 200m 0

No, it's bonkers. If anyone sees a nand gate with an input tied to ground they would quite correctly think the output of the gate is a logic one. But the authour of LTspice knows better than the rest of the known universe and does his own thing.

In LTspice if you want a logic zero on an input you either have to drive it, or tie it to ground with a resistor.

Or you can just attach an unconnected wire to it, or leave it unconnected, but these two options are undocumented and so really should not be relied upon.

Oh - I see in my circuit I have a liitle unconnected wire to node 8 of A1. That is the difference.

(to give a logic zero)

(to be clear this removes the input from the netlist and is supposed to speed up simulation)

Yes that works fine here too, with the extra bit of wire. But you can't put the extra bit of wire on all the gates, only some of them.

I put the circuit into QSpice but haven't so far got further than singular matrix.

And QSpice files don't seem to be ascii so I can't easily post it.

Not that you can list any examples. In reality, new inventions tend to be patented by several different people at much the same time.

Somebody has published a new way of looking at a problem, and several people see a way of applying the new insight.

Nobody demands "understanding" but being able to explain what you are doing to yourself can be very helpful.

That probably does describe your situation. Atoms and photons are actually pretty fundamental.

If you can't be bothered to do the science, this can be an attractive delusion.

And you have just delivered a whole bunch.

It's extremely useful if you are searching in noise for a waveform that is related to an external frequency, monitoring the modulation of an A.M. waveform or looking at a delayed signal.

The question was clearly ironic.