jaya000
Full Member level 2
To start learning RF i planned for one small signal 2 stage antenna preamplifier. Frequency range 88
-108 Mhz.Mhz. Accordingly i hv done the following according to the bias condition required. .
I hv selected input transistor with following S parameters.
f S11 S21 S12 S22
GHz MAG ANG MAG ANG MAG ANG MAG ANG
0.10 0.71 -49.5 18.61 139 0.023 65.8 0.834 -22
Feeding this data into a software vierpol (two port in English)as suggested by flatulen but in old
version. Then i got following Zin, Zout. .
For input/output impedance BJT @100 Mhz. Calculated on Vierpol in Elekta
Polar Rect
Input impedance Zi = 102.100 -65.3 42.622 -92.668
Output Impedence Zo = 233.22 -64 102.237 -209.617
The output transistor with following S parameters.
FRE S11 S21 S12 S22 K MAG1
(MHz) MAG ANG MAG ANG MAG ANG MAG ANG (dB)
100 0. .45 -78 26.73 125 0.01 69 0.68 -31 0.77 34.3
For Input output impedance BJT @100 Mhz. Calculated on Vierpol in Elekta
Polar Rect
Input Impedance Zin = 58.490 -47.8 39.289 -43.33
Output Impedance Zout = 148.82 -52.5 90.596 -118.067
I got it in polar but also coverted into rectangular.
All this is with 50 ohm input output.
I am newbie in RF. Is this ok till now?
If this is ok then i will like to know from RF experts/Gurus here that which type of circuit i must use for input/output & interstage matching? Circuit input output impedance will be 75 ohms.
-108 Mhz.Mhz. Accordingly i hv done the following according to the bias condition required. .
I hv selected input transistor with following S parameters.
f S11 S21 S12 S22
GHz MAG ANG MAG ANG MAG ANG MAG ANG
0.10 0.71 -49.5 18.61 139 0.023 65.8 0.834 -22
Feeding this data into a software vierpol (two port in English)as suggested by flatulen but in old
version. Then i got following Zin, Zout. .
For input/output impedance BJT @100 Mhz. Calculated on Vierpol in Elekta
Polar Rect
Input impedance Zi = 102.100 -65.3 42.622 -92.668
Output Impedence Zo = 233.22 -64 102.237 -209.617
The output transistor with following S parameters.
FRE S11 S21 S12 S22 K MAG1
(MHz) MAG ANG MAG ANG MAG ANG MAG ANG (dB)
100 0. .45 -78 26.73 125 0.01 69 0.68 -31 0.77 34.3
For Input output impedance BJT @100 Mhz. Calculated on Vierpol in Elekta
Polar Rect
Input Impedance Zin = 58.490 -47.8 39.289 -43.33
Output Impedance Zout = 148.82 -52.5 90.596 -118.067
I got it in polar but also coverted into rectangular.
All this is with 50 ohm input output.
I am newbie in RF. Is this ok till now?
If this is ok then i will like to know from RF experts/Gurus here that which type of circuit i must use for input/output & interstage matching? Circuit input output impedance will be 75 ohms.