differential inductor without center-tap and oscillator design

Hi,

The process I use offers a differential inductor but it does not have center-tap. I try to design an oscillator. Does it mean that I have to use this inductor as a single inductor ?

wighou

If you inductor has two windings and four connections, then it is being used as a transformer.
Frank

My inductor is the following :

I would like to design this kind of circuit :

Usually, the layout looks like this :

But, if I don′t have center tap, I have to use two inductors, don′t I ?

One way is to feed your DC to both ends of the coil by radio frequency chokes, inductors whose impedance is high at the operating frequency but can carry the DC feed OK. They will have a minor influence on the operating frequency. This arrangement is called "shunt feed".
Frank

If you add a feed line on 2nd metal layer, you may supply you VCO..