Random CMOS oscillators

a phenomenal TTL osc. at fig.3 in the previous post caused me to check if it's a specific or general situation . . . as expected it was a specific occurrence - - which left me time to play around with some new cmos RC osc. setups

what follows is a quick tune of such into operation to find out some of their speciffics . . .

it didn't get closer than that

random trivia ... this starts up pulsating - no data if that fades or not

capacitor only ver.

random reasoning - - min. "offsets" for R or C alone merged ???

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[Eop]

Yet again another 1.2V logic variant

. . . in simulation - capabilities . . .




. . . i have a bad feeling that the CMOS substitute at the same speed would use multiples of more power . . .

speed test

counter -s test (ver.3)

CLK and internals

counter variants
(they all suppose to function the same . . . but it's !NOT verified!)
note: it's an inline image -- (R)click+(L)click [View Image] for full size
by: /image-to-data-uri-converter

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[Eop]

Sine wave crystal oscillator concept

i still poorly understand how to frequency tune this thing . . . but the main concept has been achieved -- a pure undistorted sine wave form for crystal . . .

. . . i find it curious that the appropriate web search can't find any analog circuits for such . . . . . . . . . even more curious is the fact that most micro controllers use digital/discreet stages based quartz drivers that for lower frequency X-tal-s as far as i get attempt to over stress the device and eventually ruin or kill it ???
(8 billion people with no brain on this planet ... statistically impossible but is what the prolonged web search stat.-s retrieves - i roger it but i can't get it - it's insane)

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update 2017.04.10 21:41 UTC+3h : revised an old design -- not as good as previous but seemingly near the sine -- also uses a lot of less power -- it likely would work and with even less power but assumingly with longer startup time

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[Eop]