Yutao Liu
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Posts: 76
Guangzhou, China
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Dear all, I am designing a transmitter with active mixer. The supply voltage is 1.8V and the current is about 100 mA.
I use a parallel capacitor and series inductor to match the output impedance of balun to 50 Ohm at 2.35 GHz.
After impedance matching, the simulation result shows that the output power is -8 dBm at most.
However, that output power is not the maximum output power. The output power can hit 3 dBm which is pretty close to my goal. I put Port1 at the output of matching network. In this case, the magnitude of Z11 is growing in the range of 2.2GHz to 2.4 GHz. And the value at 2.35 GHz is 90 Ohm, while it drops to 50 Ohm in the case of impedance matching.
I wonder why this happen? Does the output power maximize when the output network is matched, doesn't it?
Yutao Liu
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