dangan1993
Junior Member level 3
Hi everyone,
I am trying to design a dual-band Class E power amplifier at 2.4/3.5 GHz using only transmission lines for input matching and output matching networks. In the first step, I designed and simulated the circuit on ADS schematic using microstrip lines as in Figure 1
I extracted the results, the performance at both frequency bands was as expected (about 5.3 W and over 70% PAE).
After that, I had created layout look-like components for input matching network and output matching networks individually, then append them to discrete elements (VDC, transistor and two terminations) and perform EM co-simulation.
To be carefully, I just used a EM model of input matching network, the output matching network is still in the microstrip version (like Fig 2)
The performance is significantly decreased (about 0.5 W at 2.4 GHz and 1.7 W at 3.5 GHz). I had checked input impedance of the network, it changed a lot, and this huge mismatch leads to power degradation.
Then, I tried to optimize the EM input matching network, the performance can recover to acceptable value, but the layout is changed significantly, compared to that of microstrip schematic.
I am so worry about that phenomenon :thumbsdown:, and whether I had made mistakes in momentum co-simulation or is this normal in high-frequency circuit design?
Note that, the similarity happened to the output matching network.
Thank you for your time.
I am trying to design a dual-band Class E power amplifier at 2.4/3.5 GHz using only transmission lines for input matching and output matching networks. In the first step, I designed and simulated the circuit on ADS schematic using microstrip lines as in Figure 1
I extracted the results, the performance at both frequency bands was as expected (about 5.3 W and over 70% PAE).
After that, I had created layout look-like components for input matching network and output matching networks individually, then append them to discrete elements (VDC, transistor and two terminations) and perform EM co-simulation.
To be carefully, I just used a EM model of input matching network, the output matching network is still in the microstrip version (like Fig 2)
The performance is significantly decreased (about 0.5 W at 2.4 GHz and 1.7 W at 3.5 GHz). I had checked input impedance of the network, it changed a lot, and this huge mismatch leads to power degradation.
Then, I tried to optimize the EM input matching network, the performance can recover to acceptable value, but the layout is changed significantly, compared to that of microstrip schematic.
I am so worry about that phenomenon :thumbsdown:, and whether I had made mistakes in momentum co-simulation or is this normal in high-frequency circuit design?
Note that, the similarity happened to the output matching network.
Thank you for your time.