Hello,

I have 4 stage current-controlled ring oscillator. I need to plot

oscillation frequency vs. control current plot. Control current - dc

current, it needs to be varied using parametric analysis. The frequency

of oscillators depends on the control current. Therefore, it is not

defined anywhere.

Can anyone help me.

Thanks,

Vitaliy

What's not defined anywhere?

You can measure the frequency of the oscillators several ways:

1. Using PSS analysis in oscillator mode, and then sweeping the control current.

You can then plot "harmonic frequency" on the PSS direct plot form, and it

will be versus the control frequency.

2. You could use the "frequency" function in the calculator, which will give

average frequency (you might want to use clip so you can miss out the

startup condition).

3. You could use the freq_meter component in ahdlLib to measure the

instantaneous frequency during the transient, and then do a sweep

4. Recently (may be in IC5141 USR3?) a "freq" function was added in the

calculator to give instantaneous frequency.

5. In older versions you could use the SKILL code in my solution 11015938

on http://www.yqcomputer.com/ to calculate instantaneous frequency.

Regards,

Andrew.

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