Hello,
Plz suggest me the architecture of VCO with following specs.
Freq range : 400-600KHz
Accuracy : 2% (i think this is too tough to meet but still the customer wants such accuracy)
Limit : only one high accuracy external component (R/C) is allowed
Technology : CMOS 1.2V
Use the osillator inside the CD4046.
It is very linear and it works good in taht frequency range.
It requires two resistors and a capacitor.
See the application notes.
Hello,
Plz suggest me the architecture of VCO with following specs.
Freq range : 400-600KHz
Accuracy : 2% (i think this is too tough to meet but still the customer wants such accuracy)
Limit : only one high accuracy external component (R/C) is allowed
Technology : CMOS 1.2V
I think the frequency range is too low for VLSI implementation, u will need a
large area to make the delay cell (ring oscillator ).
why don't u enlarge the frequency range to 400*20 ~ 600*20 KHz, and then divide the VCO by 20 !?
OK, the frequency range cud be made to 400*20 ~ 600*20 KHz.
but how to get 2% accuracy with a components variation of 20%.
can someone give some idea abt accurate tuning of RC delay.
the frequency is ok the area will not be larger than a Pad.
but the spec is so tough.
if the temperature is various from -40 to 125, almost impossible.
maybe bandgap can help you. or laser trimming resistor.