smm2s - Convert mixed-mode 2N-port S-parameters to single-ended 4N-port S-parameters
Syntax
s_params = smm2s(s_dd,s_dc,s_cd,s_cc)
s_params = smm2s(s_dd,s_dc,s_cd,s_cc,option)
Description
s_params = smm2s(s_dd,s_dc,s_cd,s_cc) converts
mixed-mode, N-port S-parameters into single-ended,
2N-port S-parameters, s_params. smm2s maps
the first half of the mixed-mode ports to the odd-numbered pairs of
single-ended ports and maps the second half to the even-numbered pairs.
s_params = smm2s(s_dd,s_dc,s_cd,s_cc,option) converts
the S-parameter data using the optional argument option.
You can also reorder the ports in s_params using
the snp2smp function.
Input Arguments
s_cc |
s_cc is a complex N-by-N-by-K array
containing K matrices of common-mode, N-port
S-parameters (Scc).
|
s_cd |
s_cd is a complex N-by-N-by-K array
containing K matrices of cross-mode, N-port
S-parameters (Scd).
|
s_dc |
s_dc is a complex N-by-N-by-K array
containing K matrices of cross-mode, N-port
S-parameters (Sdc).
|
s_dd |
s_dd is a complex N-by-N-by-K array
containing K matrices of differential-mode, N-port
S-parameters (Sdd).
|
option |
option determines how the function orders
the ports: 1 — smm2s maps
the first half of the mixed-mode pairs to odd-numbered pairs of single-ended
ports and maps the second half to even-numbered pairs. For example,
in a mixed-mode, 4-port network: Port 1 becomes single-ended ports 1 and 3. Port 2 becomes single-ended ports 5 and 7. Port 3 becomes single-ended ports 2 and 4. Port 4 becomes single-ended ports 6 and 8.
 2 — smm2s maps
the first half of the mixed-mode pairs to single-ended ports in ascending
numerical order, followed by the second half, also in ascending order.
For example, in a mixed-mode, 4-port network: Port 1 becomes single-ended ports 1 and 2. Port 2 becomes single-ended ports 3 and 4. Port 3 becomes single-ended ports 5 and 6. Port 4 becomes single-ended ports 7 and 8.
 3 — smm2s maps
the first half of the mixed-mode pairs to single-ended ports in ascending
numerical order. The function maps the second half to pairs of ports
in descending order. For example, in a mixed-mode, 4-port network: Port 1 becomes single-ended ports 1 and 2. Port 2 becomes single-ended ports 3 and 4. Port 3 becomes single-ended ports 8 and 7. Port 4 becomes single-ended ports 6 and 5.
|
Output Arguments
s_params |
s_params is a complex 2N-by-2N-by-K array
representing K single-ended, 2N-port
S-parameters.
|
Examples
Convert between mixed-mode and single-ended S-parameters:
% Create mixed-mode S-parameters:
ckt = read(rfckt.passive,'default.s4p');
s4p = ckt.NetworkData.Data;
[sdd,scd,sdc,scc] = s2smm(s4p);
% Convert them back to 4-port,single-ended S-parameters:
s4p_converted_back = smm2s(sdd,scd,sdc,scc);
References
Granberg, T., Handbook of Digital Techniques for
High-Speed Design.Upper Saddle River, NJ: Prentice Hall,
2004.
See Also
s2scc | s2scd | s2sdc | s2sdd | s2smm | snp2smp
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