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doubt in cmos oscillator design

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diaz080

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doubt in cmos rc oscillator design

from the papers i read cmos based rc oscillators are found to be stable with temperature variation and supply variation (around .5 % ) but the propagation delay of the inverter which is used was varying a lot with temperature Since frequency of oscillator is inversely related to propagation delay, how come the frequency is not varying across different temperature
 
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If propagation delay affects the frequency of a high frequency oscillator made with ordinary slow Cmos inverters then increase the supply voltage to speed them up or use high speed Cmos (74HCxxxx).
 
with temperature sweep frequency was not found to be varying here.but propagation delay was found varying.why is this so ? frequency and propagation delay are related,then why frequency is not varying with temperature sweep
 

A 1.2V supply is almost nothing.
The circuits I talked about are for NORMAL CD4xxx Cmos ICs in working circuits, not for custom-made ICs in wishful simulations.

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Like I said in your other thread about this fantasy circuit: OMG! The supply voltage is almost nothing.
 

Audioguru said:
A 1.2V supply is almost nothing.
The circuits I talked about are for NORMAL CD4xxx Cmos ICs in working circuits, not for custom-made ICs in wishful simulations.

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Like I said in your other thread about this fantasy circuit: OMG! The supply voltage is almost nothing.
Click to expand...

tsmc 090 lib nmos and pmos are used here.
 

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