VCO bias, regulator, phase noise

Status
Not open for further replies.
H

hakihaki

Newbie level 3
Joined
Apr 6, 2009
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,308
Hi

I'd designed VCO using replica current bias(cascode current mirror).

But now I'll design a regulator(load current - 1~2mA) for improvement to VCO phase noise.

I have a question. Which is better VCO phase noise? Is it right that the regulator have VCO phase noise to be better?

Thanks
 

you have nothing to do to improve the VCO phase noise
 

    H

    hakihaki

    Points: 2
    Helpful Answer Positive Rating
Of course, the bias circuit can influence your VCO phase noise.

There is not a specific rule. A simple bias diode can generate more noise than an integrated regulator using tens of transistors, but also can be in the other way.

The noise generated by the bias circuit depends by its output impedance, by the filtering provided, and by the gain and the noise of the internal components.
 

    H

    hakihaki

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…