ChetanGK
Newbie level 6
Hi everyone,
I am trying to find the impedance of the mixer attached and later I need to do it for differential RF.
After reading https://designers-guide.org/forum/YaBB.pl?num=1240334878/15, I understood that I cannot use port for RF input as port impedance(series resistance inside port) will affect the impedance measurement (ZM1 of PSP analysis). Hence I need to inject small signal voltage(Vinj) and measure current(iprobe) with PSS/PAC analysis and evaluate the "mag(v("/Vinj" ?result "pac"))/mag(i("/IPRB0/PLUS" ?result "pac"))" in calculator to find input impedance.
Complete setup :
- ideal switch with on res = 1 Ohm and Off res = 1T Ohms
- load resistance 1k Ohms.
Lo port :
Flo= 500K Hz
tr =tf =1fs
Duty cycle = 50%
Vlo= 1.65
Small signal voltage (Vinj) :
Analysis setup for PSS:
Analysis setup for PAC:
Result plot:
I get 2.002K Ohms as input impedance where as I expect it to be 1.001K Ohms (if not please correct me).
Is this simulation setup correct ? Why it is being scaled by a factor of 2 ?
If any information missing, let me know
I am trying to find the impedance of the mixer attached and later I need to do it for differential RF.
After reading https://designers-guide.org/forum/YaBB.pl?num=1240334878/15, I understood that I cannot use port for RF input as port impedance(series resistance inside port) will affect the impedance measurement (ZM1 of PSP analysis). Hence I need to inject small signal voltage(Vinj) and measure current(iprobe) with PSS/PAC analysis and evaluate the "mag(v("/Vinj" ?result "pac"))/mag(i("/IPRB0/PLUS" ?result "pac"))" in calculator to find input impedance.
Complete setup :
- ideal switch with on res = 1 Ohm and Off res = 1T Ohms
- load resistance 1k Ohms.
Lo port :
Flo= 500K Hz
tr =tf =1fs
Duty cycle = 50%
Vlo= 1.65
Small signal voltage (Vinj) :
Analysis setup for PSS:
Analysis setup for PAC:
Result plot:
I get 2.002K Ohms as input impedance where as I expect it to be 1.001K Ohms (if not please correct me).
Is this simulation setup correct ? Why it is being scaled by a factor of 2 ?
If any information missing, let me know