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differential amplifier and oscillator

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khorlipmin

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hi,

What is the differential between the diff amplifier and a diff oscillater delay buffer?
We need a gain of >1 for oscillaotion? Bharkausen criteria stated that but I thought most diff amplifier do have gain larger than 1? so the delay cells are just amplifiers? Do I analyse their small signal circuit just like I do with amplifiers? thanks
 

khorlipmin said:
hi,

What is the differential between the diff amplifier and a diff oscillater delay buffer?
We need a gain of >1 for oscillaotion? Bharkausen criteria stated that but I thought most diff amplifier do have gain larger than 1? so the delay cells are just amplifiers? Do I analyse their small signal circuit just like I do with amplifiers? thanks
Click to expand...

yes, i think, basiclly, you are right, you can analize the oscillator delay cell using small signal when it working in its linear region, and give a conclusion whether it meet Bharkausen criteria, although Bharkausen criteria is a necessary(but not enough) condition for oscillation.
however, compared with diff-amp, the delay cell is a 1st order system in most case(with one dominant pole), and the gain is very low (<=2) if the number of the cell >=3. so from the aspect of stable oscillation, the design of delay cell is raletively easy.
i wish above may be help to u to understand oscillator design.
jeff.yan
 

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    khorlipmin

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