Hi Fangyi: (Credit to Vladimir Dmitriev-Zdorov for approaching the ideal E-element using 2-ports.) Yes, R1=infinity, and R2=0 ------ You can model this ideal E-element in terms of G-parameters [I1] = [G11 G12][V1] , [Ge] = [0 0] [V2] [G21 G22][I2] [1 0] Using standard 2-port transformation formulas (I do not have a good link with all the formulas) to find the transmission parameters [T]: [Ge] --> [Se] = [1 0] --> [Te] = 0.5*[1 1] [2 -1] [1 1] If the TX, RX models are defined as in BIRD122: [Stx] = [0 0] --> [Ttx] = (1/S21)*[0 0] [S21 S22] [-S22 1] [Srx] = [S11 0] --> [Trx] = (1/S21)*[0 S11] [S21 0] [0 1] Pre/Post Cascading the E-element yields T-parameter products for TX/RX and their corresponding S-parameters: [T-etx] = [-0.5*S22/S21 0.5/S21] --> [S-etx] = [1 0] [-0.5*S22/S21 0.5/S21] [2*S21 S22] [T-rxe] = [0.5*S11/S21 0.5*S11/S21] --> [S-rxe] = [S11 0] [0.5/S21 0.5/S21] [2*S21 -1] The cascaded unity E-element creates the infinite input impedance for the TX model and zero output impedance for the RX model and causes the resuling S21 value to double for each case. The formulation you presented several weeks ago illustrated that S21 needed to be double its value if S11=1 to produce the same output voltage from a zero impedance voltage source at the TX model input. Bob fangyi_rao@xxxxxxxxxxx wrote:
Hi, Arpad;Can you please clarify that the ideal E-element (VCVS) in the analog model you showed at last ATM has R2=0 for Tx and R1=infinity and R2=0 for Rx (R1 & R2 are defined in the figure below)?Thanks, Fangyi
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