Re: [softrock40] Low-jitter oscillator generates any frequency from 10 MHz to 1.4 GHz
- View SourceAt 02:21 PM 8/31/2007, you wrote:
>I wrote Silicon Labs and ask: How does one compare the jitter specI'm getting senile, I forgot to answer your email.
>the way they
>present it with the way it is represented for something like the ICS601.
>This is the answer that I got (already). What do you think?
>"The Si570 has much lower jitter than this device. The ICS601 specifies period
>jitter (one-sigma) of 18 ps typ, 25 ps max, measured at 125 MHz. The Si570
>specifies period jitter (one-sigma) of 2 ps rms typ. The Si570 period jitter
>specification applies to any output frequency and signal format (CMOS, LVPECL,
That is good, I played with the ICS-601 and while using in a SoftRock
the results were fairly good, if there was noise it was not
noticeable with the 40M atmospheric noise. In layman's terms, I could
not see or hear any noticeable difference between it and the crystal
oscillator, the atmospheric noise was way higher than any noise from
the device. This chip being better does not hurt, it would be nice if
it worked out, so we could move around the band on the SoftRock. Add
a Pic/AVR/MSP430/PicAxe chip and a keypad, display, and some buttons
and one could be cruising the bands. I think a PicAxe might be
interesting on this one for some quick and dirty Basic programming.
In any case it might be a fun project, and before the purist get bent
out of shape, not this will not compare to a new fancy AD9912 DDS
with a 1 GHz clock.
"Blessed are the cracked, for they shall let in the light."