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Try to eliminate resistors at the input stage. But you can use some resistor network at the output to match broadband. You will lose some gain but it is easy. It also provides improved stability.
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I think it is not needed a distributed microwave amplifier for 12-18 GHzband...
You were right if there were only L and C. But there is transistor collector impedance seen into collector. Depending on your bias condition, a real impedance requirement appear. R(class A)=2Vce/Imax
impedance matching is requred to maximize power transfer. in this case, it is not necessary. he is measuring the voltage. also oscillator probe impedance is quite high. he is looking the dc part of the signal on the capacitor. he is not interested in AC voltage.
impedance mathcing is important...
You can calculate the impedance but it seems it is not easy. You can try to find with an EDA tool such as AWR or pspice. If it is not high power (it seems it is not), no problem, just use it. There is a small trick. If it is a tv related circuit, it is probably 75ohm. otherwise it is usually 50ohm.
First of all, you can not measure only cable impedance. You can measure it with a termination. Your measurement device gives you an almost perfect 50ohm. You will use this cable for 50ohm devices. Therefore, the impedance you measured is useful for that cable. You can use that s parameter in a...
Optimization depends on the initial values that you select. I have some suggestions for AWR. At the beginning, you should not set for high resolution.
1) Limit your upper and lower values of the components.
2) Do not use high resolution (for example 0.001pF)
3) Prefer higher or lower (< or >)...
If your antennas are not active antennas, using additional switch may decrease your GPS receiver performance. As you may know, according to Friss equation, it should be very low loss.
Ratch, I am looking for time domain numerical solution.
Guys, please do not try to change topic. I know phasor, I know differential equations, I know everything about the circuit theory. I do not know how to solve this problem in MATLAB in time domain. No hand-solution, no differential...
Thanks for the interting ideas. However we did not have an answer yet. I think I have enough data, I use MATLAB and resolution is smaller than 10^-24. I checked the numerical derivation, it is very OK.
I added my numerical solution. If we neclect R, and input voltage is sin(t), i(t) becomes...
I know the variable C equation. Consider that C is constant. So this is true:
Denominator still goes zero... So, C is not constant? How can we verify this equation?
BradtheRad; This is a computer analysis output. I am trying to understand my circuit's response, so I need to find capacitance. It does not matter, because if we use your graphs, as you see derivation is zero at the top and bottom of the sinus. So, in a numerical solution C valuse goes verh...
I use a software to find voltage and current values. (You can see it.) Voltage shape is not very good, because capacitor is not ideal, its value changes by time. So, I am trying to find a capacitance value which depends on time, such as C(t). So, I am trying a basic numerical method. I can not...
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