How to give input in binary switched capacitor array based VCO for coarse tuning in Cadence Virtuoso tool.

[Keshab_cob]

If I am giving pulse input then in PSS analysis it is showing error (autonomous circuit cannot have periodic input ). If I am deselectinge oscillator option then circuit is simulating with a bad phase noise curve.
My question is in binary switched capacitor array VCO how to give binary input.? What source to be used for coarse tuning?

Waiting for your valuable reply..

Thanking you in advance

 

[deep_sea]

For oscillation option, the PSS needs only autonomous oscillation without forcing periodic inputs. You can use parametric sweep for one bit coarse (or fine). I do not know of vpwl can work with PSS or not but you can give it a try.
If you manage to have some ideal ADC (for example 4 bits) and the analogue range is 0-15, you can use parametric sweep to sweep the analogue input from 0-15 and then your binary code will have the required tuning code.