Help with the resolution of si-based oscillator

[youyang]

Hi,

Is there anyone who has the idea what resolution (xxx ppm to the central freq) a si-based oscillator can at most achieve over temp or process respectively.

Thanks, any reply is appreciated.

 

[mbyoussef]

what is "si" ?

 

[youyang]

what is "si" ?

Silicon

 

[mikersia]

in common case, without using calibration at the system level, a thermal stability 100...500 ppm/'C can be achived. In general case 1/RC frequency oscillator can be designed,- independent from process/voltage variation of active components. R can be external or built in. In later case it can be composed from two types with total ~zero TC. Capacitors can have 20...100 ppm/'C, depending from it's type and process.
All above is IMHO.

 

[youyang]

Thank you, mikersia

Is there any recommended structure? i.e. for RC oscillator

in common case, without using calibration at the system level, a thermal stability 100...500 ppm/'C can be achived. In general case 1/RC frequency oscillator can be designed,- independent from process/voltage variation of active components. R can be external or built in. In later case it can be composed from two types with total ~zero TC. Capacitors can have 20...100 ppm/'C, depending from it's type and process.
All above is IMHO.

 

[mikersia]

exist a lot of variants. Schematic solution complexity depends on the required spec.