Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
If i add band pass filters both input and output of the amplifier. Will the amplifier is stable for entire region except the pass band ?? . Adding BPF will reduce S12 and S21 in out band , will this lead to reduce the stability problem and provide more gain??
place ufl connector on the trace which will reduce the extra stub. there is one Microwave Coaxial Connectors with Switch available with ufl size .
The internally built-in mechanical switch separates the RF circuit and ANT circuit, so that the circuit can be measured without any mutual effect...
you can use around 200 pf capacitor, which provide around 0.8 Ohm impedance at 880 Mhz . in pratical there will be some parasitic resistance and inductance will comes across the component so you can use around 60-100 pf capacitor. if you have network analyzer you can plot the impedance on the...
now i matched the transistor and added one 6 Ohm resistor in series with the input. Now the transistor is conditionally stable. I matched the transistor for maximum power so is it necessary to get S22 less than -10 dB ?
as per your comment i did the simulation. Still the stability parameter is not greater than one in 900 MHz. The input reflection coefficient is not less than -10 dB. Can you please tell me where i am wrong ?