Electronic Circuit Question.

Can we write
(11-3j)
(90+650j)
port 1 and 2?
Port 1 impedance indeed equals (11-3j)

However because port 2's impedance is specified in parallel, we must first covert it to series form before we may write it in rectangular format.

So:

Xport2 (series form)=(650*90^2)/(650^2+90^2)≈12.2271
Rport2 (series form)=(90*650^2)/(90^2+650^2)≈88.307

Hence:
Port1 Impedance = (11 - 3j)
Port2 Impedance = (88.307+12.2271j)


Got it?:)
 

Thread Starter

RRITESH KAKKAR

Joined Jun 29, 2010
2,829
Xport2 (series form)=(650*90^2)/(650^2+90^2)≈12.2271
Rport2 (series form)=(90*650^2)/(90^2+650^2)≈88.307


Please tell the formula ?
i got it.
 
Xport2 (series form)=(650*90^2)/(650^2+90^2)≈12.2271
Rport2 (series form)=(90*650^2)/(90^2+650^2)≈88.307

Please tell the formula ?
i got it.
The form 'conversion' formulae are merely an 'adaptation' of those for compounding resistors::)

Parallel Z form to Series Z form:
Xs=(Rp^2*Xp)/(Rp^2+Xp^2)
Rs=(Rp*Xp^2)/(Rp^2+Xp^2)

Series Z form to Parallel Z form:
Xp=(Rs^2+Xs^2)/Xs
Rp=(Rs^2+Xs^2)/Rs

Note: These relations yield the equivalent resistance and reactance of the discrete components --- NOT the net impedance of the circuit!!!

Best regards
HP:)
 

Thread Starter

RRITESH KAKKAR

Joined Jun 29, 2010
2,829
Port 1 impedance indeed equals (11-3j)

However because port 2's impedance is specified in parallel, we must first covert it to series form before we may write it in rectangular format.
So:
Xport2 (series form)=(650*90^2)/(650^2+90^2)≈12.2271
Rport2 (series form)=(90*650^2)/(90^2+650^2)≈88.307
Hence:
Port1 Impedance = (11 - 3j)
Port2 Impedance = (88.307+12.2271j)



but in figure there is difference, if we convert // to series we will cut the original to get value in series?
Port2 Impedance = (88.307+12.2271j)
These value are not written.
 
Port 1 impedance indeed equals (11-3j)

However because port 2's impedance is specified in parallel, we must first covert it to series form before we may write it in rectangular format.
So:
Xport2 (series form)=(650*90^2)/(650^2+90^2)≈12.2271
Rport2 (series form)=(90*650^2)/(90^2+650^2)≈88.307
Hence:
Port1 Impedance = (11 - 3j)
Port2 Impedance = (88.307+12.2271j)



but in figure there is difference, if we convert // to series we will cut the original to get value in series?
Port2 Impedance = (88.307+12.2271j)
These value are not written.
The port reactances are 'canceled' via compensation (i.e. 'adjustment' of the corresponding network reactors) and hence irrelevant:)
 
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