Hello all,
I am trying to design VCO with feedback topology (common source amplifier + pi-feedback) i.e Hartley oscillator with active inductors. First I designed a circuit with all passive components in feedback and that works fine in all PSS and PNOISE etc. Now I replaced both the inductors of feedback with active inductors and PSS doesn't work at all. I don't know whether it is a problem with my circuit or some special settings are needed, the error in PSS is like:
Error found by spectre at time = 121.667 ns during periodic steady state analysis 'pss'.
V(net0209) is too small to reliably detect the period of the oscillation. This may be because nodes with insignificant signal levels were chosen or it may be because the oscillator was never properly started.
I am using Virtuoso front to back design environment (IC 5.1.41) and simulator is spectre (not spectreRF). Here I am attaching the circuit of my oscillator where L1 and L2 are active inductors.![]()
I am trying to design VCO with feedback topology (common source amplifier + pi-feedback) i.e Hartley oscillator with active inductors. First I designed a circuit with all passive components in feedback and that works fine in all PSS and PNOISE etc. Now I replaced both the inductors of feedback with active inductors and PSS doesn't work at all. I don't know whether it is a problem with my circuit or some special settings are needed, the error in PSS is like:
Error found by spectre at time = 121.667 ns during periodic steady state analysis 'pss'.
V(net0209) is too small to reliably detect the period of the oscillation. This may be because nodes with insignificant signal levels were chosen or it may be because the oscillator was never properly started.
I am using Virtuoso front to back design environment (IC 5.1.41) and simulator is spectre (not spectreRF). Here I am attaching the circuit of my oscillator where L1 and L2 are active inductors.