frederick.im
Newbie
I designed a 32.768K xtal oscillator
i didn't add RD because RD seems it is unnecessary
but there was one sample, in more than 50 samples, working in 194K frequency
but when i put probe to its XIN/XOUT pin, working frequency changed from 194K to 32.768K (we can actual see the transformer)
and when i press the shell of xtal, the osc freq change to 32K too
is there any guy know the reason of this condition? the osc circuit or the xtal?
how can i suppress harm freq osc beside RD
i didn't add RD because RD seems it is unnecessary
but there was one sample, in more than 50 samples, working in 194K frequency
but when i put probe to its XIN/XOUT pin, working frequency changed from 194K to 32.768K (we can actual see the transformer)
and when i press the shell of xtal, the osc freq change to 32K too
is there any guy know the reason of this condition? the osc circuit or the xtal?
how can i suppress harm freq osc beside RD