flesher
Newbie level 6
Hi, All, I am working on the SSCG, some question for you.
Normally, there are two type of sscg . one is to modulate the vco control voltage . another is to modulate the divider ratio. Using the delta sigma
modulator is the common way to control divider. But how to control the delta sigma modulator input ( like 24 bits or 20 bits input) . Some papers said using the address profile or counter to generate the triangular wave control signal.
A question here, a counter with 24 bits or 20 bits will be needed if counter is used. plus the normal modulation frequency (33k). which means in the 33 us, the counter should count from 0 to 16777216, then count down from 16777216 to 0. It look improsible to count so many time durning the 33us time. Do I make a mistake? thank you.
flesher
Normally, there are two type of sscg . one is to modulate the vco control voltage . another is to modulate the divider ratio. Using the delta sigma
modulator is the common way to control divider. But how to control the delta sigma modulator input ( like 24 bits or 20 bits input) . Some papers said using the address profile or counter to generate the triangular wave control signal.
A question here, a counter with 24 bits or 20 bits will be needed if counter is used. plus the normal modulation frequency (33k). which means in the 33 us, the counter should count from 0 to 16777216, then count down from 16777216 to 0. It look improsible to count so many time durning the 33us time. Do I make a mistake? thank you.
flesher
