mwvco1
Newbie level 5
Hello,
We recently designed several kinds of vco.Its structure is similar to Colpitts.Its frequency is about 3-7GHz. We have a problem that the output of the vcos have a spurious at dozens of khz when the temperature below about -40 ℃.
We have made several experiments,and found that
1.when the source voltage reduce to 4V from 5V,the spurious disappeared;
2.when we change the tuning voltage,the frequency of spurious would change;
3.we use the battery as power supply ,but the spurious is not changed.
We don't know how and where the spurious produce.
Could you help me?
We look forward to the help of experts.
Thank you !
We recently designed several kinds of vco.Its structure is similar to Colpitts.Its frequency is about 3-7GHz. We have a problem that the output of the vcos have a spurious at dozens of khz when the temperature below about -40 ℃.
We have made several experiments,and found that
1.when the source voltage reduce to 4V from 5V,the spurious disappeared;
2.when we change the tuning voltage,the frequency of spurious would change;
3.we use the battery as power supply ,but the spurious is not changed.
We don't know how and where the spurious produce.
Could you help me?
We look forward to the help of experts.
Thank you !