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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
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Nonlinear RF >
   Three Port Mixer (MIXER3P)       

Three Port Mixer (MIXER3P)

Notes

1. Mixer S-parameters and noise parameters are treated as if they were measured on a two-port black box. The fact that the input and output frequencies are different is ignored during analy­sis. The input frequency is always used for interpreting any measurement data associated with this element.

2. Refer to <Install>\Examples\System\MixerDataFileExamples.adsn for three design exam­ples using FLP and NMF MIXERSPURS data tables.

3. The nonlinear figures of merit (OIP2, OIP3, P1dB, and PSAT) are specified based on the refer­ence LO power (PLO) parameter.

4. OIP3(dBm) = P1dB(dBm) + 10.64 dB.

5. Either OIP3 or P1dB can be specified, but not both.

6. If a MIXERSPURS data table is supplied, analysis will incorporate this table in a way similar to the 2-port mixer model. The main difference is that the LO frequency and power are deter­mined from the signal driving the LO port (as opposed to being specified for the 2-port mixer model). The fundamental frequencies at the input (first) port and the LO (third) port will gen­erate spurs at the output according to the supplied MIXERSPURS data table.

7. Note that the input and LO power levels may be optionally specified (see below) in MIXER­SPURS data tables when performing frequency domain analysis. Specifying these power lev­els is required for discrete time analysis. The measured or simulated MIXERSPURS data is assumed to be applicable to the specified input LO and RF power levels. If during simulations, the signals driving the input and/or LO ports have power levels different from those specified in the supplied data table, the generated output spurs will be adjusted based on the actual power levels. The adjustment is typically reasonable for LO levels not exceeding the reference LO power by 3dBm and for RF levels not exceeding the reference RF power by 7dBm.

8. For frequency domain analysis, if a MIXERSPURS data table is referenced by the mixer, but the table includes no information on the reference LO and/or RF power levels, then the online reference LO power parameter PLO and the input tone with the maximum input power are used as the reference LO and RF powers respectively for the MIXERSPURS data table.

9. If no MIXERSPURS data is supplied, then the nonlinear and isolation figures of merit are used to compute the output signal.

10. An example of a MIXERSPURS data table (FLP format) is shown below:

MIX_1 3-PORT ! This is the device name and number of ports

* First Mixer Spur Table

* Input signal level (dBm) LO level (dBm)

MIXERSPURS MAXORDER = 10 PLO=10dBm PRF=-20dBm

*0  1   2   3   4   5   6   7   8   9   10

20  18  32  40  50  60  70  80  90  100 110

30  0   40  50  60  70  80  90  100 110

40  20  50  60  70  80  90  70  110

50  30  60  70  80  70  80  110

60  40  70  70  80  90  100

70  50  80  90  100 110

80  60  90 100 110

90  70  100 100

100 80  110

110 100

120

11. For any MIXERSPURS data table:

NRF = The row number = harmonic number for the input carrier frequency (FRF)

NLO = The column number = harmonic number for the LO frequency (FLO)

PRF = The reference input power level, in dBm

PLO = The reference LO power level, in dBm

SPUR(NRF x FRF + NLO x FLO) = The power level of the NRF x NLO IM product, in dB, relative to the fundamental output power level.

For example, in the above MIXERSPURS data table, NRF = 0, 1, 2, ….10 and NLO = 0, 1, 2,..10 with NRF + NLO <= MAXO (default = 10).

Also, in the above data table SPUR(3 x FRF + 2 x FLO) = 50dB implies the power level of the

3 x FRF + 2 x FLO intermodulation product is 50 dB below the power level of the fundamental output frequency. Note that SPUR(FRF + FLO) = 0 since the fundamental power relative to itself is simply zero. Also note that the above (triangular) table assumes that each frequency and its corresponding image have the same power level. For example, SPUR (3 x FRF + 2 x FLO) is assumed to have the same power level as SPUR(3 x FRF - 2 x FLO).

If the actual input RF power is not equal to the specified reference RF power PRF and/or the actual LO input power is not equal to the specified reference LO power PLO, then the output IM products given above will be further adjusted. The adjustment is typically reasonable for LO levels not exceeding the reference LO power by 3dBm and for RF levels not exceeding the reference RF power by 7dBm.

Netlist Form

Mixer3P:Name n1 n2 n3 [T=val] [MS11=val] ....

Netlist Example

MIXER3p:A 12 15 17 CONVGAINMAG =-5dB OIP3=17dBm

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