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Hello,
We are testing our 1.5 GHz Power amplifier. In our first attempt, we have faced an oscillation. Our transistor is CGHV14240 CREE (wolfspeed). We utilized a resistor in series with DC feed of input and also a resonator at 1.5 GHz in parallel with a resistor. If we measure S parameters of...
Hi BMR,
Thank you for the reply.
Yes, you're right we have balun in our circuit. But the point is, we just did DC test without providing RF to PA.
Yes, we have quarter wave microstrip functioning as a RF choke. you could see the schematic of the circuit and values of resistors in the attached...
Thank you for the reply.
During the test we tried to increase and decrease the bias voltage. since we decrease the voltage it comes back to the stable state. It seems it works in on mode by reducing the bias voltage.
Thank you ahsoopk,
Actually this board is the test board of the transistor...
Hi!
We have manufactured a PA test circuit with a LDMOSFET transistor (push-pull, two transistor in one package). during the DC test, by a small change in the bias voltage (Vgs) at one point, the current increases dramatically. this behavior happens for both transistor. We tried to test...
Hi!
I want to design a power amplifier and I know one of the simulations which should be run is HB simulation. I have started with the test circuit of the transistor. after finishing this step I tried to run HB- simulation. But for some reasons it couldn't be converged. I don't know exactly what...
Hello,
I want to redesign a high power RF amplifier matching circuit to get Ideas and then modify it for our desired frequency. I'm new in electronics and especially RF. my question is, if I want to define ports for inputs matching part of the transistor, how I should do that? I've used wave...
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