aks.rfms
Junior Member level 2
In my another design...after fabrication , I got parameters as follows:
S11 = -0.6779dB
S11(Ω)= 43.5-j233.7 Ω
S21= +19.36 dB (gain)
S12= -28 dB
S22 = -20.31 dB
S22 (Ω)= +49.2+j9.8 Ω
The Problem is that , the gain is received at 0 dBm but as i increase the input power level to its rated input at 20 dB from source , the expected output from this is about 40 dBm.
the device for the mention model is 25 watts (45 dBm)
but it get saturated at 36 dBm.
As per my perception, i feel that as the input return loss is very poor in imaginary part,
most of the power is reflected back to the source from the input of the amplifier.
Kindly let me know and suggest , whether i am correct? then how to design the compensation network for the imaginary part of the impedance.
if not then what may be the cause.
and then how to resolve that .
thanking you
S11 = -0.6779dB
S11(Ω)= 43.5-j233.7 Ω
S21= +19.36 dB (gain)
S12= -28 dB
S22 = -20.31 dB
S22 (Ω)= +49.2+j9.8 Ω
The Problem is that , the gain is received at 0 dBm but as i increase the input power level to its rated input at 20 dB from source , the expected output from this is about 40 dBm.
the device for the mention model is 25 watts (45 dBm)
but it get saturated at 36 dBm.
As per my perception, i feel that as the input return loss is very poor in imaginary part,
most of the power is reflected back to the source from the input of the amplifier.
Kindly let me know and suggest , whether i am correct? then how to design the compensation network for the imaginary part of the impedance.
if not then what may be the cause.
and then how to resolve that .
thanking you