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I have similar feeling. The s-paramter given by Murata doesn't match the real components that well. But the price of murata inductor is much cheaper than Coilcraft.
I would place resistors 1-4 very close to the left pad of At1.1. Use 50 Ohm track from SMA connector to resistors 1-4. Place one pad of resistors 1-4 on the 50 Ohm track. Since your substrate is rather thick, the main parasitic effect is series inductance. Place the resistor pad on the main...
L1 is a common-mode choke and used for filter out common-mode noise. It does very effect for the differential mode noise. C1 is used to filter out differential mode noise, while almost no effect for the common-mode noise. So C1 and L1 could be determined separately based on requirement for...
It is common to use two-tone method with 1MHz spacing to measure OIP3. While for high power amplifier, the measured inter-modulation may be a function of tone space. So people need to measure different tone spacing in stead of the 1MHz space. The inter-modulation must lies inside the PA...
S-parameter works fine only for small signal. For PA, s-parameters vary with power level, so X-parameters are used instead. For PA design, efficiency and distortion are more important factors than S11 and S22. Load-pull method is used for PA impedance matching. If you really care about...
The 9.2nH in series before LNA is to obtain less reflection (with respect to either 50 or 75 OHM, but 50 OHM is more common for LNA). Then it is easier for the user to design the transmission line to another place. The idea of the T-matching for the patch antenna is the same. The matching...
Noise figure stands the ratio between the total noise above thermal noise. After LNA, both the signal and the noise level at the output has been significantly boosted, so the extra noise introduced by later stages becomes less significant.
3.5mm and SMA are mechanically compatible. The difference lies that 3.5mm uses air as dielectric material (or no dielectric material), so the operating frequency is higher than SMA. SMA has PVC like material as core, the mechanical stability is better than 3.5mm
The definition of s-parameter is based on excitation at each port. Of course you can excite two ports and the s-parameter based on linear model is still correct, but you have to consider how they are summed together at the output port.
Depends on the correlation coefficient of your two inputs, you may get S31/S32 higher than 0dB. For example, if the combiner is ideal and you have exactly the same signal x(t) at port 1 and port 2, then port 3 outputs sqrt(2)*x(t). In this case, you will get
S32=S31=3dB.
In general, the output...
Thanks a lot to both FvM and volker@muehlhaus. You two are right, it is difficult to make a simulator matching to real cable with amplitude, phase and returnloss in the same time.
I have manage to make a simulator up to 3GHz for 100m Belden 1694A with 10 realistic components. Refer to the...
Thanks for the help. I need to simulate Belden 1694A up to 600 meters. The error should be within +/-1 dB up to 6GHz. Do you have any recommended document about this topic?
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