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The minimum of the first ripple for even mode Chebyshev filters falls on DC for LPP. Therefore, it can be produced with resistive divider only. This is why you get different values of the coefficient when varying a ripple value. The resistance of one of the terminations must change from 50 Ohm...
Hi
For a single stage ampifiers the stability factors (k, mu) give accurate results. Critera of stability is based on the assumption that input and output loads are passive (moduo of reflection less than 1). When cascading amplifier stages, one transistor becomes loaded with the other one...
Hi
Unfortunately, I don't have any experience with Cadence, have used nonlinear simulators in ADS, MWO and long time ago in Serenade from Ansoft. All the nonlinear simulators that I have used were harmonic balance simulators. Not sure, but guess that most time domain (Spice based) simulators...
Hi
for reduced conduction angles classes of operations, the conventional concept of impedance matching is meaningles. You do not see the resistances and capacitances from the equivalent circuit of a transistor. Use nonlinear simulations instead to determine the match numerically.
flyhigh
Hi
Perhaps the only motivation to use signal generator and network analyser will be the possibility to measure output reflection coefficient in the real operating conditions. Not sure how this is important to you though.
flyhigh
Hi immaculate
Have you use constrains (limits) on your variables? Some formulas in microstrip models won't work if ratios of w/s/h/t/Er are not within specified limits (formulas not valid).
flyhigh
Re: Impedance matching
Hi Draytek
You can use either one, series or parallel resistor in input or output. The excellent explanation is given in
Rowan Gilmore, Les Besser – Practical RF Circuit Design for Modern Wireless Systems Volume II - Active Circuits and Systems, Artech House, 2003
More...
Re: Impedance matching
Hi
If you are making LNA match input first for gain/noise trade-off. Then you can look at the drain to see which impedance is seen there and apply conjugate matching. For PA you start by matching output for optimum power output/efficiency and then conjugately match...
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There are no good and bad way to define a port. You should choose one direction and phases of S parameters will be referenced to this direction. For an example, if you are analising multiport microstrip circuit use the same orientation for all ports, it doesn't matter if it is directed up or...
Hi
To use negate elements from ADS/MWO, you must have (measured or EM simulated) S parameter block of connectors, transitions and line lengths before you can successfully use it. If you have OSL or TRL calibration data, you must implement equations for de-embedding. Both, ADS and MWO have the...
Hi
Don't rely on SRF of inductor to create an RF choke, it doesn't work all the time. Better solution is to apply a series connection of an inductance that will be high impedance at 5 GHz and one that will be high impedance at 10 GHz.
flyhigh
Hi
I guess BigBoss didn't assume that noise parameters are not available for the particular device. If they were, they should be listed in the same .s2p file.
Rakesh, as vfone pointed out, you got to have frequency dependent noise data known before start your work in MWO, otherwise you cannot...
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