Feb 28, 2005 #1 N Nonsense Junior Member level 2 Joined Dec 7, 2004 Messages 24 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 243 Please refer to the pix attached for the simulated circuit. the real part of Zin I got is -52.450@1GHz, -22.039@2GHz. I'm wondering why does this happen. Best Regards.
Please refer to the pix attached for the simulated circuit. the real part of Zin I got is -52.450@1GHz, -22.039@2GHz. I'm wondering why does this happen. Best Regards.
Feb 28, 2005 #2 G g579 Full Member level 6 Joined Dec 31, 1999 Messages 322 Helped 19 Reputation 38 Reaction score 4 Trophy points 1,298 Location Somewhere Activity points 2,470 Re: Why do I get a negative Re(Zin) while performing SP in A Perhaps the ckt is not unconditionally stable.
Re: Why do I get a negative Re(Zin) while performing SP in A Perhaps the ckt is not unconditionally stable.
Feb 28, 2005 #3 B biff44 Advanced Member level 6 Joined Dec 24, 2004 Messages 5,047 Helped 1,376 Reputation 2,748 Reaction score 1,056 Trophy points 1,393 Location New England, USA Activity points 37,908 Re: Why do I get a negative Re(Zin) while performing SP in A Why does that happen? So that microwave engineers can get paid! It is a good thing.
Re: Why do I get a negative Re(Zin) while performing SP in A Why does that happen? So that microwave engineers can get paid! It is a good thing.
Mar 1, 2005 #4 M mreza1355 Member level 2 Joined Feb 28, 2005 Messages 46 Helped 4 Reputation 8 Reaction score 1 Trophy points 1,288 Activity points 1,676 Re: Why do I get a negative Re(Zin) while performing SP in A Hi, I think you have biasing problem. check your dc bias poins. your transistors aren't in active region. Regards
Re: Why do I get a negative Re(Zin) while performing SP in A Hi, I think you have biasing problem. check your dc bias poins. your transistors aren't in active region. Regards
Mar 1, 2005 #5 N Nonsense Junior Member level 2 Joined Dec 7, 2004 Messages 24 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 243 Re: Why do I get a negative Re(Zin) while performing SP in A Hi, I surely have checked the bias conditions, they're definitely in the active regions. I apprecitate if you have a shot at this circuit with SP simulation. Thank you.
Re: Why do I get a negative Re(Zin) while performing SP in A Hi, I surely have checked the bias conditions, they're definitely in the active regions. I apprecitate if you have a shot at this circuit with SP simulation. Thank you.
Mar 1, 2005 #6 R Ruritania Member level 5 Joined Nov 18, 2004 Messages 93 Helped 4 Reputation 8 Reaction score 3 Trophy points 1,288 Activity points 856 Re: Why do I get a negative Re(Zin) while performing SP in A I agree with g579: it's the stability problem. Rgs. Ruri
Re: Why do I get a negative Re(Zin) while performing SP in A I agree with g579: it's the stability problem. Rgs. Ruri