wccheng
Full Member level 5
Dear all,
I design a LNA. Firstly, I don't added any bondwire effect (1nH in series with 1ohm to pretend a bondwire) on each pad for the simulation. Afterwards, I added the bondwire model at each pad and do the simulation again. I found the NF is 3dB higher compared to the LNA without bondwire model. It is terrible. I have searched each bondwire model. I found the major contribution of the NF is the bondwire connect between bottom current source (core differential LNA) of the transistor's source and ground. Actually, how could I fix this problem? I have tried to use two pads to decrease the bondwire's inductance value. However, it is fail.
Another interesting thing is that the LNA is same in ADS and Cadence. I have added all the bondwire effect in both platform. However, the Cadence will give wrose result.
Thanks
wccheng
I design a LNA. Firstly, I don't added any bondwire effect (1nH in series with 1ohm to pretend a bondwire) on each pad for the simulation. Afterwards, I added the bondwire model at each pad and do the simulation again. I found the NF is 3dB higher compared to the LNA without bondwire model. It is terrible. I have searched each bondwire model. I found the major contribution of the NF is the bondwire connect between bottom current source (core differential LNA) of the transistor's source and ground. Actually, how could I fix this problem? I have tried to use two pads to decrease the bondwire's inductance value. However, it is fail.
Another interesting thing is that the LNA is same in ADS and Cadence. I have added all the bondwire effect in both platform. However, the Cadence will give wrose result.
Thanks
wccheng