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input impedance of LC-VCO (Read 3426 times)

AZADBAKHT Community Member Offline Posts: 40	input impedance of LC-VCO Dec 30^th, 2015, 11:06am hi all i want to simulate the input impedance of an LC-VCO in cadence-virtuoso can anyone help me? regards, Azadbakht
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Ken Kundert Global Moderator Offline Posts: 2384 Silicon Valley	Re: input impedance of LC-VCO Reply #1 - Dec 30^th, 2015, 11:04pm Impedance is voltage over current. You can measure it with a small signal analysis such as PAC, though a simple AC analysis might be accurate enough. -Ken
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AZADBAKHT Community Member Offline Posts: 40	Re: input impedance of LC-VCO Reply #2 - Dec 31^st, 2015, 9:28am thank you very much sir Ken Kundert in reality, i need to calculate impedance of control voltage line! can you help me in detail for do this analysis (how to setup port and detail properties of them!)? regards, Azadbakht
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Ken Kundert Global Moderator Offline Posts: 2384 Silicon Valley	Re: input impedance of LC-VCO Reply #3 - Jan 1^st, 2016, 2:15pm You drive the input with a voltage source. On the source you specify a small signal magnitude. If you specify the magnitude to be one volt and plot the current, then the current equal to the admittance. -Ken
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AZADBAKHT Community Member Offline Posts: 40	Re: input impedance of LC-VCO Reply #4 - Jan 2^nd, 2016, 12:06am thank you so much dear Ken Kundert
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